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DEVELOPMENT OF INCONEL~ ALLOY 783,A LOW THERMAL EXPANSION,CRACK GROWTH RESISTANT SUPERALLOY 被引量:25
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作者 J.H.Thndermann(Inco Alloys International, Inc., Huntington, WV 25705, USA ) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第6期503-507,共5页
Low thermal expansion superalloys have been used for a number of years in a variety of applications, including gas turbine engines. The low thermal expansion characteristics of the most widely used class of materials ... Low thermal expansion superalloys have been used for a number of years in a variety of applications, including gas turbine engines. The low thermal expansion characteristics of the most widely used class of materials are derived from the ferromagnetic characteristics of Ni, Fe, and Co-based austenitic matrices containing little or no Cr.Alloy developments have been aimed at improving the oxidation resistance and stress accelerated grain boundary oxygen (SAGBO) attack.INCONEL alloy 783 is an oxidation resistant, low coefficient of thermal expansion superalloy developed for gas turbine applications. Alloy 783 represents a culmination in the development, of an alloy system with very high alumtnum content that, in addition to forming γ′,causes βaluminide phase precipitation in the austenitic matrix.This type of structure can be processed to resist both SAGBO and general oxidation,while providing low thermal expansion and useful mechanical properties up to 700℃.Key aspects of the alloy's development are presented. 展开更多
关键词 coefficient of thermal expansion oxidation resistance crack growth resistance SAGBO inconel alloy 783 alloy 718 gamma prime phase beta phase
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Precipitation Study in Inconel 625 Alloy by Positron Annihilation Spectroscopy 被引量:2
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作者 M.Ahmad. W.Ahmad. +2 位作者 M.A.Shaikh Mahmud Ahmad M.U.Rajput 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第5期434-436,共3页
Precipitation in Inconel 625 alloy has been studied by positron annihilation spectroscopy and electron microscopy. The observed dependence of annihilation characteristics on aging time is attributed to the change of t... Precipitation in Inconel 625 alloy has been studied by positron annihilation spectroscopy and electron microscopy. The observed dependence of annihilation characteristics on aging time is attributed to the change of the positron state due to the increase and decrease of the density and size of the 7' precipitates. Hardness measurements and lifetime measurements are in good agreement. 展开更多
关键词 Positron lifetime PRECIPITATION inconel 625 alloy Fast-fast coincidence system HARDNESS
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Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing 被引量:2
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作者 Sai Guo Guanhui Ren Bi Zhang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第6期224-239,共16页
New materials and manufacturing technologies require applicable non-destructive techniques for quality assurance so as to achieve better performance.This study comprehensively investigated the effect of influencing fa... New materials and manufacturing technologies require applicable non-destructive techniques for quality assurance so as to achieve better performance.This study comprehensively investigated the effect of influencing factors includ-ing excitation frequency,lift-off distance,defect depth and size,residual heat,and surface roughness on the defect EC signals of an Inconel 738LC alloy produced by selective laser melting(SLM).The experimental investigations recorded the impedance amplitude and phase angle of EC signals for each defect to explore the feasibility of detecting sub-surface defects by merely analyzing these two key indicators.Overall,this study revealed preliminary qualitative and roughly quantitative relationships between influencing factors and corresponding EC signals,which provided a prac-tical reference on how to quantitively inspect subsurface defects using eddy current testing(ECT)on SLMed parts,and also made solid progress toward on-line ECT in additive/subtractive hybrid manufacturing(ASHM)for fabricating SLMed parts with enhanced quality and better performance. 展开更多
关键词 Eddy current testing Subsurface defect Additive/subtractive hybrid manufacturing Selective laser melting inconel 738LC alloy
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Effects of Heating and Hot Extrusion Process on Microstructure and Properties of Inconel 625 Alloy 被引量:5
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作者 刘德学 CHENG Xiaowei +1 位作者 ZHANG Xiao DING Yutian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第6期1368-1376,共9页
The effects of the heating process and hot extrusion on the microstructure and properties of inconel 625 alloy were studied. The experimental results showed that the properties of Inconel 625 alloy could be improved t... The effects of the heating process and hot extrusion on the microstructure and properties of inconel 625 alloy were studied. The experimental results showed that the properties of Inconel 625 alloy could be improved through the heating process and hot extrusion concomitant with a reduced corrosion rate. The M23C6 carbide, generated in the heating process, was retained and distributed at the grain boundary during the process of hot extrusion, which had an important influence on both elongation and corrosion resistance. The improvement of the comprehensive properties of the material, as measured by a tensile test at room temperature, was correlated with the dissolution of segregation Nb. A typical ductile fracture changed to a cleavage fracture where secondary cracks could be clearly seen. With the increase of the extrusion ratio, the real extrusion temperature was higher, which led to more dissolution of the M23C6 carbide, decreased the number of secondary cracks, enhanced the effect of solid solution strengthening, and reduced the intergranular corrosion rate. Under the condition of a high extrusion ratio and a high extrusion speed, the less extrusion time made it possible to obtain organization with a smaller average grain size. Moreover, in this case, the M23C6 carbide and segregated Nb did not have enough time to diffuse. Thus all samples exhibited medium strengths and corrosion rates after extrusion. 展开更多
关键词 inconel 625 alloy hot extrusion mechanical property microstructure evolution
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Influence of magnetically constricted arc traverse speed (MCATS) on tensile properties and microstructural characteristics of welded Inconel 718 alloy sheets 被引量:1
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作者 Tushar Sonar Visvalingam Balasubramanian +2 位作者 Sudersanan Malarvizhi Thiruvenkatam Venkateswaran Dhenuvakonda Sivakumar 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第4期1395-1413,共19页
The magnetically constricted arc technique was implemented to mitigate the heat input related metallurgical problems in Gas Tungsten Arc Welding(GTAW)of Inconel 718 alloy particularly Nb segregation and subsequent lav... The magnetically constricted arc technique was implemented to mitigate the heat input related metallurgical problems in Gas Tungsten Arc Welding(GTAW)of Inconel 718 alloy particularly Nb segregation and subsequent laves phase evolution in fusion zone.This paper reports the direct effect of magnetically constricted arc traverse speed(MCATS)on bead profile,tensile properties and microstructural evolution of Inconel 718 alloy sheets joined by Gas Tungsten Constricted Arc Welding(GTCAW)process.The mechanism amenable for the microstructural modification and corresponding influence on the tensile properties of joints is investigated both in qualitative and quantitative manner related to the mechanics of arc constriction and pulsing.It is correlated to the solidification conditions during welding.The relationship between MCATS and Arc Constriction Current(ACC)was derived.Its interaction effect on the magnetic arc constriction and joint performance was analysed.Results showed that the joints fabricated using CATS of 70 mm/min exhibited superior tensile properties(98.39% of base metal strength with 31.50% elongation).It is attributed to the grain refinement in fusion zone microstructure leading to the evolution of finer,discrete laves phase in interdendritic areas. 展开更多
关键词 GTCA welding inconel 718 alloy Magnetically constricted arc traverse speed Tensile properties Microstructure Laves phase
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Phase-field simulation of lack-of-fusion defect and grain growth during laser powder bed fusion of Inconel 718 被引量:2
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作者 Miaomiao Chen Renhai Shi +4 位作者 Zhuangzhuang Liu Yinghui Li Qiang Du Yuhong Zhao Jianxin Xie 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第11期2224-2235,共12页
The anisotropy of the structure and properties caused by the strong epitaxial growth of grains during laser powder bed fusion(L-PBF)significantly affects the mechanical performance of Inconel 718 alloy components such... The anisotropy of the structure and properties caused by the strong epitaxial growth of grains during laser powder bed fusion(L-PBF)significantly affects the mechanical performance of Inconel 718 alloy components such as turbine disks.The defects(lack-of-fusion Lo F)in components processed via L-PBF are detrimental to the strength of the alloy.The purpose of this study is to investigate the effect of laser scanning parameters on the epitaxial grain growth and LoF formation in order to obtain the parameter space in which the microstructure is refined and LoF defect is suppressed.The temperature field of the molten pool and the epitaxial grain growth are simulated using a multiscale model combining the finite element method with the phase-field method.The LoF model is proposed to predict the formation of LoF defects resulting from insufficient melting during L-PBF.Defect mitigation and grain-structure control during L-PBF can be realized simultaneously in the model.The simulation shows the input laser energy density for the as-deposited structure with fine grains and without LoF defects varied from 55.0–62.5 J·mm^(-3)when the interlayer rotation angle was 0°–90°.The optimized process parameters(laser power of 280 W,scanning speed of 1160 mm·s^(-1),and rotation angle of 67°)were computationally screened.In these conditions,the average grain size was 7.0μm,and the ultimate tensile strength and yield strength at room temperature were(1111±3)MPa and(820±7)MPa,respectively,which is 8.8%and10.5%higher than those of reported.The results indicating the proposed multiscale computational approach for predicting grain growth and Lo F defects could allow simultaneous grain-structure control and defect mitigation during L-PBF. 展开更多
关键词 inconel 718 alloy laser powder bed fusion scanning parameter optimization lack-of-fusion phase-field method finite element method
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KINETICS OF δ PHASE PRECIPITATION IN COLD ROLLED INCONEL 718 ALLOY
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作者 Liu Wenchang, Yao Mei (Yanshan University, Qinhuangdao, China, 066004) Liu Runguang (Harbin Institute of Technology, Harbin, China, 150001) Chen Zonglin, Jiang Zhaoqun, Wang Shaogang (Shenyang Liming Engine Manufacturing Company, Shenyang, C 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1997年第3期54-57,共4页
The volume fraction of δ phase in cold rolled Inconel 718 alloy aged at 910℃ for different times is measured by X ray diffraction techniques, and the influence of cold rolling on the kinetics of δ phase precipitat... The volume fraction of δ phase in cold rolled Inconel 718 alloy aged at 910℃ for different times is measured by X ray diffraction techniques, and the influence of cold rolling on the kinetics of δ phase precipitation is investigated. It has been found that the relation between the volume fraction of δ phase and aging time follows the Avrami equation. With increasing cold rolling reduction, the value of n decreases and the value of a increases. 展开更多
关键词 cold rolling precipitation (chemistry) KINETICS inconel 718 alloy δ phase
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Introduction of a New Method for Regulating Laves Phases in Inconel 718 Superalloy during a Laser-Repairing Process
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作者 Shang Sui Haosheng Li +3 位作者 Zuo Li Xuan Zhao Liang Ma Jing Chen 《Engineering》 SCIE EI CAS 2022年第9期239-246,共8页
The morphology,size,and distribution of Laves phases have important influences on the mechanical properties of laser-repaired Inconel 718(IN718)superalloy.Due to the deterioration of the substrate zone,the Laves phase... The morphology,size,and distribution of Laves phases have important influences on the mechanical properties of laser-repaired Inconel 718(IN718)superalloy.Due to the deterioration of the substrate zone,the Laves phase in the laser cladding zone of IN718 superalloy cannot be optimized by a hightemperature solution treatment.In this study,an in situ laser heat-treatment method was proposed to regulate the morphology and size of the Laves phase in the laser cladding zone of IN718 superalloy without impacting the substrate zone.In the in situ laser heat-treatment process,a laser was used to heat previously deposited layers with optimized manufacturing parameters.A thermocouple and an infrared camera were used to analyze thermal cycles and real-time temperature fields,respectively.Microstructures and micro-segregations were observed by optical microscopy,scanning electron microscopy,and electron probe microanalysis.It was found that the in situ laser heat treatment effectively changed the morphology and size of the Laves phase,which was transformed from a continuous striplike shape to a discrete granular shape.The effective temperature range and duration were the two main factors influencing the Laves phase during the in situ laser heat-treatment process.The effective temperature range was determined by the laser linear energy density,and the peak temperature increased with the increase of the linear energy density.In addition,the temperature amplitude could be reduced by simultaneously increasing the laser power and the scanning velocity.Finally,a flow diagram was developed based on the in situ laser heat-treatment process,and the deposition of a single-walled sample with fine and granular Laves phases was detected. 展开更多
关键词 Laser repair In situ laser heat treatment inconel 718 alloy Laves phase
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NICKEL-BASE ALLOY SHEET ALLOYS USED IN AEROSPACE APPLICATIONS 被引量:1
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作者 J.H. Tundermann(Inco Alloys International,Inc.,Huntington,WV 25705,USA ) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第6期423-432,共10页
Many gas turbine components are made from nickel alloy sheet. Most are used for directing or containing gases at high temperatures and pressures where metal temperatures can be as high as 1090℃ (2000°F). These a... Many gas turbine components are made from nickel alloy sheet. Most are used for directing or containing gases at high temperatures and pressures where metal temperatures can be as high as 1090℃ (2000°F). These applications included combustor systems, casings and liners, transition and exhaust ducting, afterburners, and thrust reversere. Light weight components and sub-assemblies call for alloy sheet with high levels of stength and oxidation resistance. Complex component design calls for excellent ductility and ease of fabrication.The wide range of nickel alloy sheet alloys presently used in aircraft and land-based gas turbines is briefly described and typical properties presented. New sheet alloy developments, involving INCONEL ̄* alloys 625LCF, 718SPF and MA754, are presented including the process routes involved and material properties. 展开更多
关键词 aerospace sheet products nickel-base alloys inconel alloy 625LCF inconel alloy 718SPF inconel alloy MA754 low cycle fatigue superplastic forming oxide dispersion strengthened
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Orientational growth behavior and mechanism of delta(δ)phase precipitation in cold-rolled Inconel 718 alloy during heat treatment 被引量:1
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作者 Neng-yong Ye Guang-liang Zhang +3 位作者 Tian-yue Huang Ming Cheng Shi-hong Zhang Lei Wang 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2024年第1期264-274,共11页
Due to the important role ofδphase's quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components,it is necessary to renew insights into the effect of cold deformation ... Due to the important role ofδphase's quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components,it is necessary to renew insights into the effect of cold deformation on theδphase precipitation,especially on the morphology evolution.Therefore,the nucleation and growth behavior ofδphase in cold-rolled Inconel 718 alloy during aging were investigated.The results show that the precipitation rate and volume fraction ofδphase increase with increasing the cold rolling reduction from 10%to 50%.The volume fraction ofδphase reaches equilibrium after 5 h,remaining at 5.98%,6.52%,and 6.79%under different rolling reductions(10%,30%,and 50%),respectively.The nucleation ofδphase mainly occurs on different sites(grain boundaries,new twin boundaries and old twin boundaries)under 10%rolling reduction,whileδphase mainly nucleates on the new grain boundaries of static recrystallization due to 50%rolling reduction.And the growth ofδphase undergoes a process of alternate orientation growth from spherical(nucleation)→short rod(longitudinal orientation growth)→short rod(radial orientation growth)→dynamic equilib-rium.Under 10%rolling reduction,δphase tends to grow into the matrix,while under 50%rolling reduction,the orientation grows faster and is easily affected by the grain boundary curvature. 展开更多
关键词 inconel 718 alloy Cold rolling δphase Orientation growth Morphology evolution
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Phase Transformation Strengthening of Hot Extruded Inconel 625 under High-temperature Load Environment 被引量:2
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作者 刘德学 CUI Maomao +5 位作者 王文旭 NAN Hongqiang CAI Haopeng XUE Hongdi JIA Zhi LI Qinglin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第6期1297-1308,共12页
Microstructure evolution and properties of hot-extruded Inconel 625 alloy were investigated at different creep temperatures, aging time and strain rates. The experimental results indicate that the Inconel 625 alloy ex... Microstructure evolution and properties of hot-extruded Inconel 625 alloy were investigated at different creep temperatures, aging time and strain rates. The experimental results indicate that the Inconel 625 alloy exhibits an excellent creep resistance at 700 ℃ and below. When the creep temperature rises to 750 ℃, the creep resistance falls drastically due to the failure of phase transformation strengthening and the precipitation of a large amount of δ phase and σ phase at the grain boundary. The special temperature-sensitive characteristics of Inconel 625 alloy play a very important role in its fracture. When the strain rate is 8.33×10^-3s^-1, the strength of the specimen is higher than that of other parameters attributed to the effect of phase transformation strengthening. With the increase of Ni3(Al, Ti), the phase transformation strengthening inhibits thickening of the stacking faults into twins and improves the overall mechanical properties of the alloy. With the increase of the aging time, the granular Cr-rich M23C6 carbides continue to precipitate at the grain boundary, which hinders the movement of the dislocations and obviously increases the strength of the samples. Especially, the yield strength increases several times. 展开更多
关键词 hot-extruded inconel 625 alloy phase transformation strengthening temperature sensitivity characteristics Cr-rich M23C6 carbides δphase
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Influence of laser parameters on segregation of Nb during selective laser melting of Inconel 718 被引量:1
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作者 Liang Wang Ran Cui +5 位作者 Bin-qiang Li Xue Jia Long-hui Yao Yan-qing Su Jing-jie Guo Tong Liu 《China Foundry》 SCIE CAS 2021年第4期379-388,共10页
A transient three-dimensional powder-scale model was established for understanding the flow field and mass transfer within the molten pool during the selective laser melting(SLM)of Inconel 718 alloy by considering som... A transient three-dimensional powder-scale model was established for understanding the flow field and mass transfer within the molten pool during the selective laser melting(SLM)of Inconel 718 alloy by considering some important physical phenomena,such as,a transition from powder to solid,nonlinearities produced by temperature-dependent materials’properties,and fluid flow in the calculation.The influence of laser power or scanning speed on the flow field and cooling rate was discussed in detail.The simulation results reveal that the motion of molten pool and higher cooling rate promote the mass transfer and benefit the solute distribution by increasing laser power.However,with increasing the scanning speed,the melt flow speed and cooling rate are elevated,resulting in an agglomeration of the solute elements,which is ascribed to the shorter dwelling time of liquid.Therefore,the segregation of Nb can be effectively suppressed by increasing laser power or decreasing scanning speed,which can decrease the dwelling time of liquid. 展开更多
关键词 selective laser melting inconel 718 alloy flow field mass transfer SEGREGATION
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Effect of rotation angle on surface morphology, microstructure, and mechanical properties of Inconel 718 alloy fabricated by high power laser powder bed fusion
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作者 Qiao Zhong Kaiwen Wei +2 位作者 Taoyuan Ouyang Xiangyou Li Xiaoyan Zeng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第23期30-42,共13页
Rotation angle of the laser scan direction between two adjacent layers is a key controlling parameter during the high-power (≥ 1 kW) laser powder bed fusion (HP-LPBF) process. This study investigates the influen... Rotation angle of the laser scan direction between two adjacent layers is a key controlling parameter during the high-power (≥ 1 kW) laser powder bed fusion (HP-LPBF) process. This study investigates the influences of rotation angles (θ  = 0°, 45°, 90°, 105°) on the surface morphology, microstructure, and mechanical properties of Inconel 718 (IN718) alloy produced by HP-LPBF. Results show that adopting low rotation angles (e.g., 0° and 45°) is prone to relatively poor surface finish and lack-of-fusion defects, whereas adopting high rotation angles (e.g., 90° and 105°) induces smaller surface roughness and better relative density. Each case reveals a noticeable edge effect but the maximal heights witness a downward trend with the increase of rotation angle. There are some minor differences in the primary dendrite arm spacing and grain morphology by varying the rotation angles. Moreover, the tensile property is slightly enhanced as the rotation angle increases. The present work suggests that high rotation angles like 90° and 105° would probably be more favorable for the 1 kW HP-LPBF process than rotation angles with relatively low values. 展开更多
关键词 High-power laser powder bed fusion Rotation angle Surface morphology MICROSTRUCTURE Mechanical properties inconel 718 alloy
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Laser Direct Metal Deposition Technology and Microstructure and Composition Segregation of Inconel 718 Superalloy 被引量:12
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作者 ZHANG Qun-li YAO Jian-hua Jyoti Mazurnder 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2011年第4期73-78,共6页
Multilayer of laser direct metal deposition(DMD)was prepared by depositing a gas atomized pre-alloyed powder with a composition close to Inconel 718 alloy on Inconel 718 high temperature alloy substrate.The effects ... Multilayer of laser direct metal deposition(DMD)was prepared by depositing a gas atomized pre-alloyed powder with a composition close to Inconel 718 alloy on Inconel 718 high temperature alloy substrate.The effects of the DMD parameters on the build-up rate and the structure of the deposited layer were studied.The laser DMD sample was further processed by a solution treatment.The microstructure and property of the laser DMD zone before and after heat treatment were investigated as well.The results show that the laser parameters of actual laser power of 650 W,scanning speed of 5.8 mm/s,beam diameter of 1 mm,powder feed rate of 6.45 g/min,with a corresponding specific energy of 90-130 J/mm2,can be recommended as optimum parameters for high build-up rate of Inconel 718 alloy.Under the condition of optimized parameters,a directional solidification microstructure was obtained and the average distance between the columnar crystals was 5-10 μm.The microcomposition segregation was found between the columnar crystal trunk and columnar crystal.The elements of Nb,Mo,Ti concentrated in the columnar crystal trunk.After the heat treatment,the segregation was greatly minimized,and the segregation ratios were close to 1.The hardness of the laser deposited layer did not show obvious difference along the height of the layer either for the as-deposited layer or for the heat treated layer.However,the microhardness of the laser DMD zone after heat treatment was obviously higher than that after the as-deposited treatment.During the heat treatment process,some Nb-and Mo-rich phases precipitated and strengthened DMD layer. 展开更多
关键词 laser DMD inconel 718 alloy composition segregation MICROSTRUCTURE HARDNESS
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Microstructure and mechanical properties in the TLP joint of FeCoNiTiAl and Inconel 718 alloys using BNi2 filler 被引量:5
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作者 Lin Yuan Jiangtao Xiong +3 位作者 Yajie Du Jin Ren Junmiao Shi Jinglong Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第2期176-185,共10页
High entropy alloy(HEA) of Fe Co Ni Ti Al and Inconel 718 superalloy were firstly transient liquid phase(TLP) bonded by BNi2 filler due to the diffusion of Si and B in the filler to the base metals. The effects of bon... High entropy alloy(HEA) of Fe Co Ni Ti Al and Inconel 718 superalloy were firstly transient liquid phase(TLP) bonded by BNi2 filler due to the diffusion of Si and B in the filler to the base metals. The effects of bonding time on microstructure evolution and mechanical properties of the TLP joints were investigated.Owing to the complete isothermal solidification of the joints bonded for 30 min 120 min at 1100°C,no athermally solidified zones(ASZs) formed by eutectic phases were observed in the welded zone. Thus the TLP joints were only composed by the isothermally solidified zone(ISZ) and two diffusion affected zone(DAZ) adjacent to the dissimilar base metals and the negative effect of the ASZ on joint properties can be avoided. In addition, the increase of the bonding time can also make the Ti B2 borides precipitated in the DAZ near HEA and the brittle borides or carbides in the DAZ near IN718 alloy decrease and reduce the possibility of the stress concentration happened in the joints under loading. Therefore, the highest shear strength(632.1 MPa) of the TLP joints was obtained at 1100°C for 120 min, which was higher than that of the joint bonded for 30 min, 404.2 MPa. Furthermore, the extension of the bonding time made the fracture mechanism of the joint be transformed from the intergranular fracture to the transgranular fracture. However, as the brittle borides in the DAZ near IN718 can not be eliminated completely and refining of grains also happened in such region, all the TLP joints fractured inner the DAZ near IN718 alloy. 展开更多
关键词 FeCoNiTiAl alloy inconel 718 alloy Microstructure evolution Mechanical properties Fracture mechanism
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Oxidation resistance of nickel-based superalloy Inconel 600 in air at different temperatures 被引量:4
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作者 Dong-Sheng Li Guang Chen +3 位作者 Dan Li Qi Zheng Pei Gao Ling-Ling Zhang 《Rare Metals》 SCIE EI CAS CSCD 2021年第11期3235-3240,共6页
Inconel 600 alloy is widely utilized for high temperature environment application due to the corresponding good oxidation and corrosion resistance properties.In order to estimate the high temperature oxidation resista... Inconel 600 alloy is widely utilized for high temperature environment application due to the corresponding good oxidation and corrosion resistance properties.In order to estimate the high temperature oxidation resistance of Inconel 600 alloy at various temperatures,the oxidation weight gain of all specimens was measured and fitted for the curve at the temperatures of 700,800 and 900 ℃ for exposure time of 100 h.The surface morphology and the component of the oxide film were analyzed by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS) and X-ray diffraction(XRD).The results indicate that the high temperature oxidation resistance of Inconel 600 alloy is excellent blew 800℃ due to the oxidation kinetic curves at different temperatures corresponding to the parabola dynamic rules.This means that the oxidation film protects the substrate well.The dense oxide layer formation containing Cr_(2)O_(3) and NiCr_(2)O_(4) at 700 and 800 ℃ and MnCr_(2)O_(4) at 900 ℃,respectively,is the main reason for the good oxidation resistance.In contrast,the oxide layer peels off easily under applied force as the temperature increases beyond 800℃, on account of the complicated compositions of the oxide film and the binding force between the oxide layer and the substrate weakening.Corresponding oxidation mechanism is expected to be understood and the oxidation resistance of Inconel 600 alloy is improved through binding force enhancement. 展开更多
关键词 inconel 600 alloy High temperature oxidation Oxide layer Oxidation mechanism
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Grain Growth Behavior of Inconel 625 Superalloy 被引量:3
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作者 Min LIU Wen-jie ZHENG +3 位作者 Jin-zhong XIANG Zhi-gang SONG En-xiang PU Han FENG 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2016年第10期1111-1118,共8页
The grain growth(GG)behavior of Inconel 625 superalloy was studied in the temperature range of 900-1 250 ℃and holding time range of 10-80 min.Microstructures of the alloy were characterized by optical metallography... The grain growth(GG)behavior of Inconel 625 superalloy was studied in the temperature range of 900-1 250 ℃and holding time range of 10-80 min.Microstructures of the alloy were characterized by optical metallography,scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Grains grew obviously with either increasing temperature or extending holding time at temperatures above 1 050℃.However,at temperatures lower than 1 050 ℃,the GG was sluggish due to the pinning effect of carbide particles on grain boundary(GB).Threshold temperature for transition from mixed grain structure to uniform one was considered to be around 1 100℃.Once the temperatures surpassed 1 200℃,an instant increase in the grain size occurred showing no dependence on holding time.TEM analysis showed that the dominant second phase formed heterogeneously on the GB was M6 C,which significantly impeded grain growth.On the basis of experimental data,the mathematical model of GG was established,which can describe GG behavior of Inconel 625 alloy during solution treatment(ST)at 1 100-1 250 ℃.The activation energy for GG of Inconel 625 alloy was 207.3kJ,which suggested that the GG of Inconel 625 alloy was controlled by the process of GB diffusion. 展开更多
关键词 inconel 625 alloy growth kinetics solution treatment PRECIPITATION
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Interfacial reaction mechanism of TiBw/Ti6Al4V composites and Inconel 718 alloys by GTAW heat transmission 被引量:3
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作者 GAO YaNan HUANG LuJun +3 位作者 SUN Yuan AN Qi ZHANG Jie GENG Lin 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2019年第12期2293-2301,共9页
A good joint of Ti Bw/Ti6Al4V composites and Inconel 718 alloys was obtained by Gas Tungsten Arc Welding(GTAW) heat transmission. The interfacial reaction mechanism of joint was investigated and analyzed in details. O... A good joint of Ti Bw/Ti6Al4V composites and Inconel 718 alloys was obtained by Gas Tungsten Arc Welding(GTAW) heat transmission. The interfacial reaction mechanism of joint was investigated and analyzed in details. Owing to the heat input applied on the surface of Ti Bw/Ti6Al4V composites, a solid-state reaction layer appeared at the interface of Ti Bw/Ti6Al4 V composites to Inconel 718 alloys. The thickness of the reaction layer was obviously increased with increasing heat input.Developing of reaction layer mainly depended on the diffusion of elements of Ti and Ni through the interface during welding to form solid solutions and intermetallic compounds(IMCs). The reaction layer can be divided into Ti-rich zone(layer 2) and Nirich zone(layer 1). In Ni-rich zone, relatively coarse dendrites were the predominant, however, more brittle IMCs like Ti2Ni were found in the Ti-rich zone. Micro hardness of reaction layer was much higher than that of base metal. While a slight decrease of hardness was found between Ti-rich zone and Ni-rich zone due to the formation of TiNi. 展开更多
关键词 TiBw/Ti6A14V composites inconel 718 alloys interfacial reaction heat transmission microstructures
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Effects of Carbon Content on Mechanical Properties of Inconel 718 Alloy 被引量:2
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作者 Wen-jie ZHENG Xian-ping WEI +3 位作者 Zhi-gang SONG Qi-long YONG Han FENG Qing-cheng XIE 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2015年第1期78-83,共6页
For improving the service performance of Inconel 718 alloy, especially used as a corrosion-resistant alloy for special environment, the microstructure and mechanical property of different carbon-containing Inconel 718... For improving the service performance of Inconel 718 alloy, especially used as a corrosion-resistant alloy for special environment, the microstructure and mechanical property of different carbon-containing Inconel 718 alloys were investigated by the Thermo-Calc software and experiments. The experimental results indicated that the mor- phology, distribution and types of carbides mainly existing in the form of MC'were hardly influenced by solution treatment at 1050 ℃ for 1 h. The precipitation amount and particle size of carbides decreased with the decrease of carbon content, which was the main reason resulting in the increase of ductility and toughness. In addition, moving dislocation could be restrained by the precipitation of carbides. Therefore, the strength could benefit from the precip- itation strengthening of carbides when the precipitation of γ′/γ″ phase was not influenced by the precipitation of carbides. 展开更多
关键词 inconel 718 alloy MICROSTRUCTURE CARBIDE mechanical property precipitation strengthening
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Effects of current path on structure and segregation during electroslag remelting process of Inconel 718 alloy with same power input 被引量:1
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作者 Fu-bin Liu Hai-bo Cao +2 位作者 Hua-bing Li Zhou-hua Jiang Xin Geng 《Journal of Iron and Steel Research(International)》 SCIE EI CSCD 2021年第12期1574-1581,共8页
Current-conductive mold was recently developed to extend electroslag remelting(ESR)functions to overcome some solidification defects by changing the current path.The macrostructures,microstructures,macrosegregation,an... Current-conductive mold was recently developed to extend electroslag remelting(ESR)functions to overcome some solidification defects by changing the current path.The macrostructures,microstructures,macrosegregation,and microsegregation of the Inconel 718 ingots produced by the custom laboratory-scale ESR furnace under different current paths(the classical ESR and the single power,and two circuits ESR process with current-conductive mold(ESR-STCCM))with the same power input were compared and investigated.The results indicate that when the ingot was produced during ESR and ESR-STCCM processes,at the same power input,the pool depth was 104 and 90 mm,respectively.A flatter and shallower molten pool was obtained during ESR-STCCM process.Moreover,compared with a classical ESR ingot,the cooling rate of the centerline of ESR-STCCM ingot was increased from 12.7 to 16.7 K min^(−1).The increased cooling rates caused by decreased melting rate and thinner slag skin reduced the growth angle of columnar crystal to the vertical axis and the secondary dendrite arm spacing.Furthermore,the macrosegregation and microsegregation of segregation elements for ESR-STCCM process were dramatically reduced compared with ESR process.The average volume fraction of Laves phase was reduced from 7.39%to 6.14%,and the segregation of Nb in Laves phase was significantly reduced. 展开更多
关键词 Electroslag remelting Current path STRUCTURE SEGREGATION inconel 718 alloy Current-conductive mold
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