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Effect of additives on anode passivation in direct electrolysis process of copper–nickel based alloy scraps 被引量:2
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作者 LI Lei LI Hong-juan +1 位作者 QIU Shi-wei WANG Hua 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第4期754-763,共10页
Effects of nickel component,thiourea,glue and chloride ions and their interactions on the passivation of copper–nickel based alloy scrap anodes were investigated by combining conventional electrochemical techniques.R... Effects of nickel component,thiourea,glue and chloride ions and their interactions on the passivation of copper–nickel based alloy scrap anodes were investigated by combining conventional electrochemical techniques.Results obtained from chronopotentiometry and linear voltammetry curves showed that the Ni component made electrochemical stability of the anode strong and difficult to be corroded,caused by the adsorption of generated Cu2O,NiO or copper powder to the anode surface.The Ni2+reducing Cu2+to Cu+or copper powder aggravated the anode passivation.In a certain range of the glue concentration≤8×10–6 or thiourea concentration≤4×10–6,the increase of glue or thiourea concentration increases the anode passivation time.Over this range,glue and thiourea played an adverse effect.The increase of chloride ions concentration led to the increase in passivation time. 展开更多
关键词 copper–nickel based alloy scrap direct electrolysis nickel component anode passivation additive
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NOTCH WEAR OF MACHINING NICKEL BASED ALLOYS WITH CERAMIC TOOLS
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作者 He Ning Pan Liangxian Zhang Youzhen (Nanjing University of Aeronautics and Astronautics) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1995年第4期262-266,共17页
The performances of mixed ceramic and sialon ceramic tools in machining nickel based alloy are tested.The negative cutting edge inclination and small tool lead angle are recommended for reducing ceramic tool failure.... The performances of mixed ceramic and sialon ceramic tools in machining nickel based alloy are tested.The negative cutting edge inclination and small tool lead angle are recommended for reducing ceramic tool failure. So called“notching at depth of cut”is not actually at the depth of cutting line, but out of cutting area。 The real reason of notching is caused by shocking of “sawtooth”on sawtooth- shaped burr and fin- shaped edges of chip 展开更多
关键词 Ceramic tool nickel based alloy Notch wear Metal cutting
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Roles of Zr and Y in cast microstructure of M951 nickel-based superalloy 被引量:6
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作者 周鹏杰 于金江 +2 位作者 孙晓峰 管恒荣 胡壮麒 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1594-1598,共5页
The influence of Zr and Y on the cast microstructure of a nickel-based superalloy was investigated by optical microscopy (OM),scanning electron microscopy(SEM),electron probe micro-analysis(EPMA)and X-ray diffra... The influence of Zr and Y on the cast microstructure of a nickel-based superalloy was investigated by optical microscopy (OM),scanning electron microscopy(SEM),electron probe micro-analysis(EPMA)and X-ray diffraction(XRD).Theγ+γ′eutectic volume in the superalloy rises notably with the increase of Zr or Y content.Meanwhile,the morphologies of primary MC carbides change from needle and platelet-like to blocky shape with increasing Zr and Y doped.The XRD results show that the primary MC carbide lattice constant increases with Zr and Y additions,and EPMA investigation shows that the platelet-like MC carbides contain primarily Nb and C,while those carbides in blocky shape have 39.2%Zr and 39.6%Nb in average,.These influences on the cast microstructure can be attributed to the atomic size effects of Zr and Y. 展开更多
关键词 YTTRIUM ZIRCONIUM carbides nickel based superalloys MICROSTRUCTURE SOLIDIFICATION
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Effect of Co on oxidation and hot corrosion behavior of two nickel-based superalloys under Na_(2)SO_(4)-NaCl at 900℃ 被引量:7
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作者 Jun-sheng MENG Ming-xuan CHEN +1 位作者 Xiao-ping SHI Qiang MA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第8期2402-2414,共13页
Nickel-based superalloys with and without Co by partial replacement of W were prepared using double vacuum melting.A comparison of the oxidation in air and hot corrosion behaviors under molten 75 wt.%Na2 SO4+25 wt.%Na... Nickel-based superalloys with and without Co by partial replacement of W were prepared using double vacuum melting.A comparison of the oxidation in air and hot corrosion behaviors under molten 75 wt.%Na2 SO4+25 wt.%NaCl at 900℃were systematically investigated.The results showed that partial replacement of W with Co promoted the formation of chromia scale and consequently decreased the oxidation rate.Besides,the addition of Co also retarded the internal oxidation/nitridation of Al and consequently promoted the growth of Al_(2) O3 scale,which further decreased the scaling rate and improved the adhesion of scale.Moreover,the addition of Co also further improved the hot corrosion resistance under molten Na2 SO4-NaCl salts. 展开更多
关键词 nickel based superalloys OXIDATION hot corrosion spallation resistance
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Tool wear mechanisms in the machining of Nickel based super-alloys: A review 被引量:7
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作者 Waseem AKHTAR Jianfei SUN +2 位作者 Pengfei SUN Wuyi CHEN Zawar SALEEM 《Frontiers of Mechanical Engineering》 SCIE CSCD 2014年第2期106-119,共14页
Nickel based super-alloys are widely employed in aircraft engines and gas turbines due to their high temperature strength, corrosion resistance and, excellent thermal fatigue properties. Conversely, these alloys are v... Nickel based super-alloys are widely employed in aircraft engines and gas turbines due to their high temperature strength, corrosion resistance and, excellent thermal fatigue properties. Conversely, these alloys are very difficult to machine and cause rapid wear of the cutting tool, frequent tool changes are thus required resulting in low economy of the machining process. This study provides a detailed review of the t0ol wear mechanism in the machining of nickel based super-alloys. Typical tool wear mechanisms found by different researchers are analyzed in order to find out the most prevalent wear mechanism affecting the tool life. The review of existing works has revealed interesting findings about the tool wear mechanisms in the machining of these alloys. Adhesion wear is found to be the main phenomenon leading to the cutting tool wear in this study. 展开更多
关键词 tool wear nickel based super-alloy wear mechanism
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Cracking Susceptibility After Post-Weld Heat Treatment in Haynes 282 Nickel Based Superalloy 被引量:5
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作者 L.O.Osoba A.K.Khan S.O.Adeosun 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2013年第6期747-753,共7页
This paper presents a study of the standard post-weld heat treatment (PWHT) behaviour of autogenous laser welded γ' age-hardenable precipitation strengthened nickel based superalloy Haynes 282 (HY 282). The stud... This paper presents a study of the standard post-weld heat treatment (PWHT) behaviour of autogenous laser welded γ' age-hardenable precipitation strengthened nickel based superalloy Haynes 282 (HY 282). The study involves a careful and detailed microstructural characterisation as well as an analysis of the weld cracking susceptibility during welding and Gleeble thermo-mechanical physical simulation. Various factors that could influence post-weld cracking in superalloys weld were experimentally examined. Our microstructural exami- nation of the as-solution heat treated (SHTed) material and the thermo-mechanically refined grain material shows that intergranular heat affected zone (HAZ) cracking is observable in only the as-welded SHTed material. There was no indication of post-weld heat treatment cracking in all welded materials. Our conclusion, in this study, is that the chemistry of superalloy HY 282 which aids the preclusion/formation of deleterious so- lidification microconstituents during welding as well as its relatively slow aging kinetics enhances its resistance to PWHT cracking. 展开更多
关键词 CRACKING Microstructure Analysis nickel based Superalloy
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A facile preparation and electrochemical properties of nickel based compound-graphene sheet composites for supercapacitors 被引量:5
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作者 Li-Bin Zhang Sheng-Rong Yang +2 位作者 Jin-Qing Wang Ye Xu Xiang-Zheng Kong 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第5期522-528,共7页
Composites of a nickel based compound incorporated with graphene sheets (NiBC-GS) are prepared by a simple flocculation, using hydrazine hydrate as flocculant and reductant, from a homogeneous intermixture of nickel... Composites of a nickel based compound incorporated with graphene sheets (NiBC-GS) are prepared by a simple flocculation, using hydrazine hydrate as flocculant and reductant, from a homogeneous intermixture of nickel dichloride and graphene oxide dispersed in N,N-dimethylformamide. Morphology, microstructure and thermal stability of the obtained products were characterized by field-emission scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. Furthermore, the electrochemical properties of NiBC-GS, as electrode materials for supercapacitors, were studied by cyclic voltammetry and galvanostatic charge]discharge in 2 mol L 1 KOH solution. It was determined that for NiBC-GS annealed at 250 ~C, a high specific capacitance of 2394 F g 1 was achieved at a current density of 1 A g^-1, with 78% of the value (i.e., 1864 F g^-1) retained after 5000 times of repeated galvanostatic charge/discharge cycling. The high specific capacitance and available charge/discharge stability indicate the synthesized NiBC-GS250 composite is a good candidate as a novel electrode material for supercapacitors. 展开更多
关键词 nickel based compound Graphene Electrochemical performance Supercapacitors
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Thermomechanical Fatigue Behavior of Powder Metallurgical Nickel Based Superalloy FGH96 被引量:1
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作者 GU Yu-li TAO Chun-hu HE Yu-huai 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2010年第6期74-79,共6页
The fracture behavior of the thermomechanical fatigue (TMF) of the powder metallurgical nickel based superalloy FGH96 was investigated under in-phase (IP) and out-of-phase (OP) loadings in the temperature range ... The fracture behavior of the thermomechanical fatigue (TMF) of the powder metallurgical nickel based superalloy FGH96 was investigated under in-phase (IP) and out-of-phase (OP) loadings in the temperature range from 550 ℃ to 720 ℃ and the mechanical strain amplitude range from 0.3% to 0.8%. The results show that the FGH96 TMF fracture character is intergranular for the IP samples and transgranular cleavage-like for the OP samples, at the same strain amplitude, the fatigue life is shorter for the IP than that for the OP samples that is related to crack propagation along grain boundary on the IP samples, the γ′ size is larger in the IP than that in the OP sample, which is related to the bulk diffusion processes accelerated by the tensile strain during the high temperature portion of the IP cycle. Dislocation pairs and stacking faults are main microstructures induced by IP TMF, and they are hindered by the grain boundary, which likely resulted in the crack propagation along the grain boundary in the IP samples. 展开更多
关键词 nickel based superalloy powder metallurgy thermomechanical fatigue γ′ size DISLOCATION
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Determination of Aluminum in Nickel-Based Superalloys by Using Laser-Induced Breakdown Spectroscopy 被引量:1
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作者 朱德华 王茜 +2 位作者 倪晓武 陈建平 陆建 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第4期486-489,共4页
Laser-induced breakdown spectroscopy (LIBS) was developed to detect aluminum in nickel-based superalloys (K417, GH4033, DZ125L, З ∏742y) using a non-intensified, non-gated, low-cost detection system. The precisi... Laser-induced breakdown spectroscopy (LIBS) was developed to detect aluminum in nickel-based superalloys (K417, GH4033, DZ125L, З ∏742y) using a non-intensified, non-gated, low-cost detection system. The precision of LIBS depends strongly on the experimental conditions. The calibration curves of Al(I)394.4 nm and Al(I)396.2 nm under the optimum experimental parameters are presented. Finally the limit of detection (LOD) for aluminum is calculated from the experimental data, which is in the range of 0.09% to 0.1% by weight. 展开更多
关键词 aluminum emission lines LIBS nickel based superalloys calibration curve limit of detection
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Experimental investigation for ultra-precision cutting of nickel based superalloy with the assistance of magnetic field 被引量:1
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作者 XIAO JunFeng GUO Feng +3 位作者 ZHANG Chen CHEN Xiao ZHANG JianGuo XU JianFeng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2022年第9期2170-2177,共8页
Nickel based superalloy is an important material because of its excellent properties under high temperatures.However,it is a difficult-to-machine material due to its low thermal conductivity,which can cause undesired ... Nickel based superalloy is an important material because of its excellent properties under high temperatures.However,it is a difficult-to-machine material due to its low thermal conductivity,which can cause undesired localized high temperatures in the processing area.In this study,magnetic field-assisted end face turning experiments of nickel-based superalloy is carried out under the assistance of external magnetic fields of different strengths formed by permanent magnets.The experiment results show that,compared with ordinary machining,the chip morphology is improved,the oscillation of cutting force F_(c),F_(a),and Ffare significantly reduced by 90%,88%,and 78%,and the surface roughness Ra is improved from 23 to 13 nm,the P-V value of the fan-shaped area of the machined surface is reduced,and hardness and ductility are improved after the magnetic field is applied.The experiment results indicate that the application of a magnetic field is an efficient and convenient approach to improve the cutting performance of nickel based superalloy. 展开更多
关键词 magnetic field assisted cutting nickel based superalloy ultra-precision cutting
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Study on Ultrahigh Cycle Fatigue Performance of GH4169 Nickel⁃Based Alloy at 650℃ 被引量:1
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作者 SONG Zongxian QI Hao +4 位作者 WU Zhisheng CHEN Xin ZHAO Zhenjun WU Ruizhe LIAN Zheng 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第6期970-978,共9页
The fatigue test between 10^5—10^9 cycles of GH4169 nickel‑based superalloy commonly used in aircraft engines is carried out by ultrasonic fatigue machine at 650℃.The S‑N curve is obtained and the fatigue fracture m... The fatigue test between 10^5—10^9 cycles of GH4169 nickel‑based superalloy commonly used in aircraft engines is carried out by ultrasonic fatigue machine at 650℃.The S‑N curve is obtained and the fatigue fracture morphology is observed.The fatigue S‑N curve presents a“step‑like”shape,with the first inflection point near 1×10^7 cycles and the second inflection point near 1×10^8 cycles.There is no engineering fatigue limit,and it still shows a downward trend after 107 or even 10^9 cycles.The crack initiation location is related to its life.Cracks are generated on the surface below 10^7 cycles,while it is inside above 10^7 cycles.The crack initiation source in the ultra‑high cycle fatigue at 650℃ is mainly the local intergranular fracture and casting defect of the matrix.In the phase of crack propagation,the mixed propagation of intergranular and cleavage is the main form. 展开更多
关键词 nickelbased superalloy ultrahigh cycle fatigue crack initiation
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Effect of electropulsing treatment on corrosion behavior of nickel base corrosion-resistant alloy
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作者 刘杨 王磊 +2 位作者 刘红艳 张北江 赵光普 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第9期1970-1975,共6页
Electropulsing treatment(EPT) was performed on a nickel base corrosion resistant alloy during aging.The effect of EPT on the microstructure and corrosion resistance of the alloy and the mechanisms were investigated.... Electropulsing treatment(EPT) was performed on a nickel base corrosion resistant alloy during aging.The effect of EPT on the microstructure and corrosion resistance of the alloy and the mechanisms were investigated.The results show that the intergranular corrosion resistance can be improved substantially without the degradation of mechanical properties of the alloy by EPT.The EPT has an effect of enhancing the interface diffusion rate of the alloying element,which is higher than the body diffusion rate.And thus discontinuous precipitation of M23C6 type carbides appears at the grain boundary in the alloy by EPT,which decreases the depletion extent of the alloying elements at the grain boundary substantially.As a result,the intergranular corrosion resistance of the alloy can be improved by the EPT without any degradation of mechanical properties. 展开更多
关键词 nickel base alloy ELECTROPULSING discontinuous precipitation intergranular corrosion
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HIGH-TEMPERATURE LOW CYCLE FATIGUE BEHAVIOR OF NICKEL BASE SUPERALLOY GH536 被引量:1
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作者 M.Zhao, L. Y. Xu, K.S. Zhang and B. Y. Yang Department of Aeroengines and Thermal Power, Northwestern Polytechnical University, Box 184, Xi’an 710072, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2001年第5期387-390,共4页
Low cycle fatigue tests on nickel base superalloy GH536 were performed at 600, 700 and 800℃. The strain-life and cyclic stress-strain relationship were given at various temperatures. The change in fatigue life beha... Low cycle fatigue tests on nickel base superalloy GH536 were performed at 600, 700 and 800℃. The strain-life and cyclic stress-strain relationship were given at various temperatures. The change in fatigue life behavior and fatigue parameters with tem- perature increasing was discussed. At low and intermediate total strain amplitudes, the fatigue life was found to decrease with increasing temperature. 展开更多
关键词 low cycle fatigue nickel base superalloy GH536 least square method
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Laser repairing surface crack of Ni-based superalloy components 被引量:1
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作者 王忠柯 叶和清 +1 位作者 许德胜 黄索逸 《中国有色金属学会会刊:英文版》 CSCD 2001年第4期572-575,共4页
Surface crack of components of the cast nickel base superalloy was repaired with twin laser beams under proper technological conditions. One laser beam was used to melt the substrate material of crack, and the other t... Surface crack of components of the cast nickel base superalloy was repaired with twin laser beams under proper technological conditions. One laser beam was used to melt the substrate material of crack, and the other to fill in powder material to the crack region. The experimental results show that the surface crack with the width of 0.1 ~ 0.3?mm could be repaired under the laser power of 3?kW and the scanning speed of 6 ~ 8?mm/s. The repaired deepness of crack region is below 6.5?mm. The microstructure of repaired region is the cellular crystal, columnar crystal dendrite crystal from the transition region to the top filled layer. The phases in repaired region mainly consisted of supersaturated α Co with plenty of Ni, some Cr and Al, Cr 23 C 6, Co 2B, Co Ni Mo, Ni 4B 3, TiSi and VSi. The hardness of filled layer in repaired region ranged from HV 0.2 450 to HV 0.2 500, and the hardness decreases gradually from the filled layer to joined zone. 展开更多
关键词 van of aviation engine surface crack laser repairing nickel base alloy
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Life Prediction Model for a Nickel-base Single Crystal Superalloy DD3
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作者 岳珠峰 杨治国 吕震宙 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2002年第4期239-243,共5页
The possibility of a life prediction model for nickel base single crystal blades has been studied. The fatigue creep (FC) and thermal fatigue creep(TMFC) as well as creep experiments have been carried out with differe... The possibility of a life prediction model for nickel base single crystal blades has been studied. The fatigue creep (FC) and thermal fatigue creep(TMFC) as well as creep experiments have been carried out with different hold time of DD3. The hold time and the frequency as well as the temperature range are the main factors influencing the life. An emphasis has been put on the micro mechanism of the rupture of creep, FC and TMFC. Two main factors are the voiding and degeneration of the material for the cre... 展开更多
关键词 nickel base single crystal superalloy life prediction model thermal fatigue creep
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High-performance (K,Na)NbO_(3)-based multilayer piezoelectric ceramic actuators with nickel inner electrodes 被引量:1
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作者 Yu Huan Limin Hou +4 位作者 Tao Wei Fenghua Jiang Ting Wang Longtu Li Xiaohui Wang 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第6期1228-1237,共10页
Multilayer ceramic actuator(MLCA)has been widely employed in actuators due to the large cumulative displacement under the low driving voltage.In this work,the MLCA devices consisting of a lead-free MnCO_(3-)and CuO-do... Multilayer ceramic actuator(MLCA)has been widely employed in actuators due to the large cumulative displacement under the low driving voltage.In this work,the MLCA devices consisting of a lead-free MnCO_(3-)and CuO-doped 0.96(K_(0.48)Na_(0.52))(Nb_(0.96)Ta_(0.04))O_(3)-0.04CaZrO_(3) piezoelectric ceramics and a base nickel(Ni)metal inner electrode were well co-fired by the two-step sintering process in a reducing atmosphere.The ceramic layer/electrode interface is well-integrated and clearly continuous without distinct interdiffusion and chemical reaction,which is beneficial to the electrical reliability of the MLCA.As a result,the MLCA laminated with nine active ceramic layers obtains an ultrahigh piezoelectric coefficient d_(33) of 3157 pC/N,about 9 times than bulk ceramics.The 0.5 mm-thick MLCA composed of a series of~50μm-thick ceramic layers and~3μm-thick Ni electrodes reaches a high 1.8μm displacement under the low applied voltage of 200 V(the same displacement requires a voltage as high as 3700 V for~1 mm-thick bulk ceramics).The excellent electrical performance and low-cost base electrode reveal that the(K,Na)NbO_(3)(KNN)-based MLCAs are promising lead-free candidate for actuator application. 展开更多
关键词 multilayer ceramic actuator(MLCA) lead-free piezoelectric ceramics base nickel(Ni)inner electrode wo-step sintering process ceramic layer/electrode interface
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Site occupation evolution of alloying elements in L1_2 phase during phase transformation in Ni_(75)Al_(7.5)V_(17.5)
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作者 张明义 刘富 +3 位作者 陈铮 郭红军 岳广全 杨坤 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2439-2443,共5页
Correlation between site occupation evolution of alloying elements in L12 phase and growth of DO22 phase in Ni75Al7.5V17.5 was studied using microscopic phase field model. The results demonstrate that the growing proc... Correlation between site occupation evolution of alloying elements in L12 phase and growth of DO22 phase in Ni75Al7.5V17.5 was studied using microscopic phase field model. The results demonstrate that the growing process of DO22 phase can be divided into two stages. At the early stage, composition in the centre part of L12 phase almost remains unchanged, and the nucleation and growth of DO22 phase is controlled by the decrease of interface between L12 phases. At the late stage, part of V for growth of DO22 phase is supplied from the centre part of L12 phase and mainly comes from Al sublattice, the excess Ni spared from the decreasing L12 phase migrates into the centre part of L12 phase and occupies the Ni sublattices exclusively, while the excess Al mainly occupies the Al sublattice. At the late stage, the growth of DO22 phase is controlled by the evolution of antisite atoms and ternary additions in the centre part of L12 phase. 展开更多
关键词 nickel based superalloys Ni75Al7.5V17.5 alloy phase transformation micro-phase field grain growth antisite defect
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A numerical study on the influence of grain boundary oxides on dwell fatigue crack growth of a nickel-based superalloy 被引量:1
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作者 C.Z.Fang H.C.Basoalto +3 位作者 M.J.Anderson H.Y.Li S.J.Williams P.Bowen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第9期224-235,共12页
A theoretical treatment on the oxide-controlled dwell fatigue crack growth of aγ'strengthened nickelbased superalloys is presented.In particular,this study investigates the influence of an externally applied load... A theoretical treatment on the oxide-controlled dwell fatigue crack growth of aγ'strengthened nickelbased superalloys is presented.In particular,this study investigates the influence of an externally applied load and variations in theγ'dispersion on the grain boundary oxide growth kinetics.A dislocation-based viscoplastic constitutive description for high temperature deformation is used to simulate the stress state evolution in the vicinity of a crack at elevated temperature.The viscoplastic model explicitly accounts for multimodalγ'particle size distributions.A multicomponent mass transport formulation is used to simulate the formation/evolution of an oxide wedge ahead of the crack tip,where stress-assisted vacancy diffusion is assumed to operate.The resulting set of constitutive and mass transport equations have been implemented within a finite element scheme.Comparison of predicted compositional fields across the matrix/oxide interface are compared with experiments and shown to be in good agreement.Simulations indicate that the presence of a fineγ'size distribution has a strong influence on the predicted ow stress of the material and consequently on the relaxation in the vicinity of the crack-tip/oxide wedge.It is shown that a unimodal dispersion leads to reduced oxide growth rates(parabolic behavior)when compared to a bimodal one.Stability conditions for oxide formation are investigated and is associated with the prediction of compressive stresses within the oxide layer just ahead of the crack tip,which become progressively negative as the oxide wedge develops.However,mechanical equilibrium requirements induce tensile stresses at the tip of the oxide wedge,where failure of the oxide is predicted.The time taken to reach this critical stress for oxide failure has been calculated,from which dwell crack growth rates are computationally derived.The predicted rates are shown to be in good agreement with available experimental data. 展开更多
关键词 nickel based superalloy Dwell crack growth Gamma prime Creep Oxidation Dislocation-based modeling Multicomponent diffusion Finite element method
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First-principles study of the effects of selected interstitial atoms on the generalized stacking fault energies, strength, and ductility of Ni 被引量:1
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作者 李春霞 党随虎 +2 位作者 王丽萍 张彩丽 韩培德 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第11期454-458,共5页
We analyze the influences of interstitial atoms on the generalized stacking fault energy (GSFE), strength, and ductility of Ni by first-principles calculations. Surface energies and GSFE curves are calculated for t... We analyze the influences of interstitial atoms on the generalized stacking fault energy (GSFE), strength, and ductility of Ni by first-principles calculations. Surface energies and GSFE curves are calculated for the (112) (111) and / 101) ( 1 1 1) systems. Because of the anisotropy of the single crystal, the addition of interstitials tends to promote the strength of Ni by slipping along the (10T) direction while facilitating plastic deformation by slipping along the (115) direction. There is a different impact on the mechanical behavior of Ni when the interstitials are located in the slip plane. The evaluation of the Rice criterion reveals that the addition of the interstitials H and O increases the brittleness in Ni and promotes the probability of cleavage fracture, while the addition of S and N tends to increase the ductility. Besides, P, H, and S have a negligible effect on the deformation tendency in Ni, while the tendency of partial dislocation is more prominent with the addition of N and O. The addition of interstitial atoms tends to increase the high-energy barrier γmax, thereby the second partial resulting from the dislocation tends to reside and move on to the next layer. 展开更多
关键词 first principles generalized stacking fault energy nickel based alloys strength and ductility
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Effect of Melt Superheating on the Morphology of MC Carbide in a Cast Ni-base Superalloy M963 被引量:3
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作者 殷凤仕 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第3期42-45,共4页
The effect of the melt superheating temperature on the as cast microstructure of a cast nickel base superalloy M963 has been investigated. The results show that the as cast microstructure of the alloy consists of ... The effect of the melt superheating temperature on the as cast microstructure of a cast nickel base superalloy M963 has been investigated. The results show that the as cast microstructure of the alloy consists of γ solid solution matrix,γ′ precipitate in cubic shape, (γ+γ′) eutectic and MC carbide, and the morphology of MC carbide in the microstructure can be varied from coarse scriptlike, fine scriptlike to fine cubelike or discontinuous particles by increasing the melt superheating temperature. The mechanism of melt superheating is discussed by means of differential thermal analysis (DTA) technique. 展开更多
关键词 cast nickel base superalloy melt superheating MC carbide differential thermal analysis
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