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Electrochemical Hydrogen Charging on Corrosion Behavior of Ti-6Al-4V Alloy in Artificial Seawater 被引量:1
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作者 Yanxin Qiao Yue Qin +5 位作者 Huiling Zhou Lanlan Yang Xiaojing Wang Zhengbin Wang Zhenguang Liu Jiasheng Zou 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第1期296-308,共13页
This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The ... This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The findings revealed the formation ofγ-TiH andδ-TiH_(2) hydrides in the alloy after hydrogen charging.Prolonging hydrogen charging resulted in more significant degradation of the alloy microstructure,leading to deteriorated protectiveness of the surface film.This trend was further confirmed by the electrochemical measurements,which showed that the corrosion resistance of the alloy progressively worsened as the hydrogen charging time was increased.Consequently,this work provides valuable insights into the mechanisms underlying the corrosion of Ti-6Al-4V alloy under hydrogen charging conditions. 展开更多
关键词 ti-6Al-4V alloy Hydrogen charging Electrochemical corrosion Passive film
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Microstructural evolution and mechanical properties of duplex-phase Ti6242 alloy treated by laser shock peening
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作者 Pu-ying SHI Xiang-hong LIU +3 位作者 Yong REN Zeng TIAN Feng-shou ZHANG Wei-feng HE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2521-2532,共12页
The effects of laser shock peening(LSP)on the microstructural evolution and mechanical properties of the Ti6242 alloy,including the residual stress,surface roughness,Vickers microhardness,tensile mechanical response,a... The effects of laser shock peening(LSP)on the microstructural evolution and mechanical properties of the Ti6242 alloy,including the residual stress,surface roughness,Vickers microhardness,tensile mechanical response,and high-cycle fatigue properties,were studied.The results showed that the LSP induced residual compressive stresses on the surface and near surface of the material.The maximum surface residual compressive stress was−661 MPa,and the compressive-stress-affected depth was greater than 1000μm.The roughness and Vickers micro-hardness increased with the number of shocks,and the maximum hardness-affected depth was about 700μm after three LSP treatments.LSP enhanced the fraction of low-angle grain boundaries,changed the grain preferred orientations,and notably increased the pole density ofαphase on the near surface from 2.41 to 3.46.The surface hardness values of the LSP samples increased with the increase of the number of shocks due to work hardening,while the LSP had a limited effect on the tensile properties.The high-cycle fatigue life of the LSP-treated sample was significantly enhanced by more than 20%compared with that of the untreated sample,which was caused by the suppression of the initiation and propagation of fatigue cracks. 展开更多
关键词 duplex-phase Ti6242 alloy surface modification laser shock peening gradient microstructure high-cycle fatigue properties
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Effect ofαphase on fatigue crack growth of Ti-6242 alloy 被引量:4
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作者 Hang-wei Zhou Hui-qun Liu +4 位作者 Dan-qing Yi Yu Xiao Xiao-long Zhao Jian Wang Qi Gao 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第8期811-822,共12页
Fatigue crack growth as a function ofαphase volume fraction in Ti-6Al-2Sn-4Zr-2Mo(Ti-6242)alloy was investigated using fatigue testing,optical microscopy,scanning electron microscopy,and transmission electron micro... Fatigue crack growth as a function ofαphase volume fraction in Ti-6Al-2Sn-4Zr-2Mo(Ti-6242)alloy was investigated using fatigue testing,optical microscopy,scanning electron microscopy,and transmission electron microscopy.Theα+βannealing treatments with different solid solution temperatures and cooling rates were conducted in order to tailor microstructure with differentαphase features in the Ti-6242 alloy,and fatigue crack growth mechanism was discussed after detailed microstructure characterization.The results showed that fatigue crack growth rate of Ti-6242 alloy decreased with the decrease in volume fraction of the primaryαphase(αp).Samples with a large-sizedαgrain microstructure treated at high solid solution temperature and slow cooling rate have lower fatigue crack growth rate.The appearance of secondaryαphase(αs)with the increase of solid solution temperature led to crack deflection.Moreover,a fatigue crack growth transition phenomenon was observed in the Paris regime of Ti-6242 alloy with 29.8% αp(typical bi-modal microstructure)and large-sizedαgrain microstructure,owing to the change of fatigue crack growth mechanism. 展开更多
关键词 ti-6242 alloy Microstructure tailoring Fatigue crack growth α phase Fatigue crack growth rate Crack propagation transition
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Investigation of the Laser Powder Bed Fusion Process of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy 被引量:1
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作者 Changchun Zhang Tingting Liu +2 位作者 Wenhe Liao Huiliang Wei Ling Zhang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第2期78-90,共13页
Laser powder bed fusion(LPBF)is an advanced manufacturing technology;however,inappropriate LPBF process parameters may cause printing defects in materials.In the present work,the LPBF process of Ti-6.5Al-3.5Mo-1.5Zr-0... Laser powder bed fusion(LPBF)is an advanced manufacturing technology;however,inappropriate LPBF process parameters may cause printing defects in materials.In the present work,the LPBF process of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy was investigated by a two-step optimization approach.Subsequently,heat transfer and liquid flow behaviors during LPBF were simulated by a well-tested phenomenological model,and the defect formation mechanisms in the as-fabricated alloy were discussed.The optimized process parameters for LPBF were detected as laser power changed from 195 W to 210 W,with scanning speed of 1250 mm/s.The LPBF process was divided into a laser irradiation stage,a spreading flow stage,and a solidification stage.The morphologies and defects of deposited tracks were affected by liquid flow behavior caused by rapid cooling rates.The findings of this research can provide valuable support for printing defect-free metal components. 展开更多
关键词 Laser powder bed fusion ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy Process parameters Heat transfer and liquid flow DEFECTS
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Ti-6242S合金在β区的锻造工艺研究 被引量:4
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作者 脱祥明 彭益群 岳耀峰 《稀有金属》 EI CAS CSCD 北大核心 2000年第4期282-286,共5页
采用光学显微镜、扫描电镜和力学性能测试等设备研究了Ti 6 2 42S合金相变点以上 45℃ (即 10 5 0℃ )加热 ,变形量为 70 %空冷的锻造工艺 ,经双重退火处理 ,获得细小网篮状组织。这种组织与α+β两相区锻造下的等轴组织相比 ,不但具有... 采用光学显微镜、扫描电镜和力学性能测试等设备研究了Ti 6 2 42S合金相变点以上 45℃ (即 10 5 0℃ )加热 ,变形量为 70 %空冷的锻造工艺 ,经双重退火处理 ,获得细小网篮状组织。这种组织与α+β两相区锻造下的等轴组织相比 ,不但具有良好的室温和高温力学性能 ,而且还提高了材料的高温持久、蠕变强度、冲击和断裂韧性。该合金的 β区锻造工艺 ,可以用于加工航空发动机压气机盘模锻件。 展开更多
关键词 ti-6242S合金 β区 锻造 显微组织 性能
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Bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy 被引量:11
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作者 李宏 张超 +1 位作者 刘宏彬 李淼泉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第1期80-87,共8页
The bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy at different bonding time were investigated. The results show that the average size of voids decreases while the amount ... The bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy at different bonding time were investigated. The results show that the average size of voids decreases while the amount of voids decreases after increasing to the maximum value with the increasing bonding time. The irregular void with a scraggly edge tends to an ellipse void with smooth surface and then changes to a tiny void with round shape. The grains across bonding interface occur at bonding time of 60 min. The shear strength of bond increases with increasing bonding time, and the highest shear strength of bond is 887.4 MPa at 60 min. The contribution of plastic deformation on the void closure and the increase of shear strength is significant even though the action time of plastic deformation is short. 展开更多
关键词 ti-17 titanium alloy diffusion bonding bonding interface VOID shear strength
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Effect of wet shot peening on Ti-6Al-4V alloy treated by ceramic beads 被引量:7
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作者 陈国清 焦岩 +3 位作者 田唐永 张新华 李志强 周文龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第3期690-696,共7页
Ti-6Al-4V alloy was processed by wet shot peening with ceramic beads. The effects of the shot peened intensity on the microstructure, surface morphology, and residual stress were investigated. A tensile-tensile fatigu... Ti-6Al-4V alloy was processed by wet shot peening with ceramic beads. The effects of the shot peened intensity on the microstructure, surface morphology, and residual stress were investigated. A tensile-tensile fatigue test was performed and the fracture mechanism was proposed. The results demonstrate that the surface roughness after wet shot peening is obviously lower than that after dry shot peening. With the increase of the shot peened intensity, the depth of the residual stress layer increases to 250 ktrn, and the maximum stress in this layer increases to -895 MPa. The fatigue strength also increases by 12.4% because of the wet shot peening treatment. The dislocation density of the surface layer is significantly enhanced after the wet shot peening with ceramic beads. The microstructure of the surface layer is obviously refined into ultra-fine grains. 展开更多
关键词 ti-6Al-4V alloy wet shot peening microstructure residual stress fatigue property
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Effect of electropulsing on deformation behavior of Ti-6Al-4V alloy during cold drawing 被引量:10
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作者 周岩 陈国清 +1 位作者 付雪松 周文龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期1012-1021,共10页
Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) were used to investigate effect of electropulsing on microstructure and texture evolution of Ti-6Al-4V during cold drawing. Rese... Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) were used to investigate effect of electropulsing on microstructure and texture evolution of Ti-6Al-4V during cold drawing. Research results demonstrate that the electropulsing treatment (EPT) can enhance the deformability of the grains with unfavorable orientations, which makes the compatibility of deformation among grains much better. A comparison in texture evolution between conventional cold drawing and EPT cold drawing indicates that the EPT promotes prismatic 〈a〉 slip moving, restricts pyramidal 〈c+a〉 slip occurring and accommodates the deformation with c-component by grain boundary sliding. The fraction decrease of low-angle grain boundaries for samples deformed with EPT reveals that the application of electropulsing restricts the formation of the incidental dislocation boundaries and the geometrically necessary boundaries. 展开更多
关键词 ti-6Al-4V alloy ELECTROPULSING cold drawing texture evolution
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Temperature and stress fields in electron beam welded Ti-15-3 alloy to 304 stainless steel joint with copper interlayer sheet 被引量:9
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作者 张秉刚 王廷 +2 位作者 段潇辉 陈国庆 冯吉才 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期398-403,共6页
Electron beam welding of Ti-15-3 alloy to 304 stainless steel (STS) using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding pro... Electron beam welding of Ti-15-3 alloy to 304 stainless steel (STS) using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding process were numerically simulated and experimentally measured. The results show that the rotated parabola body heat source is fit for the simulation of the electron beam welding. The temperature distribution is asymmetric along the weld center and the temperature in the titanium alloy plate is higher than that in the 304 STS plate. The thermal stress also appears to be in asymmetric distribution. The residual tensile stress mainly exists in the weld at the 304 STS side. The copper filler metal decreases the peak temperature and temperature grade in the joint as well as the residual stress. The longitudinal and lateral residual tensile strengths reduce by 66 MPa and 31 MPa, respectively. From the temperature and residual stress, it is concluded that copper is a good filler metal candidate for the electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel. 展开更多
关键词 ti-15-3 alloy 304 stainless steel electron beam welding temperature field residual stress
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Preparation and osteoinduction of active micro-arc oxidation films on Ti-3Zr-2Sn-3Mo-25Nb alloy 被引量:5
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作者 余森 于振涛 +3 位作者 GuiWANG 韩建业 麻西群 Matthew S.DARGUSCH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期573-580,共8页
A layer of porous film containing Ca and P was prepared by the micro-arc oxidation method on the surface of a novel near β biomedical Ti-3Zr-2Sn-3Mo-25Nb alloy, and then NH2- active group was introduced to the films ... A layer of porous film containing Ca and P was prepared by the micro-arc oxidation method on the surface of a novel near β biomedical Ti-3Zr-2Sn-3Mo-25Nb alloy, and then NH2- active group was introduced to the films by activation treatment. The phase composition, surface micro-topography and elemental characteristics of the micro-arc oxidation films were investigated with XRD, SEM, EDS and XPS, and the osteoinduction of the micro-arc oxidation films was tested using the simulated body fluid immersion, the in-vitro osteoblast cultivation test and animal experiment. The results show that the oxide layer is a kind of porous ceramic intermixture and contains Ca and P. The films in the simulated body fluid can induce apatite formation, resulting in excellent bioactivity. The cell test discovers that osteoblasts can grow well on the surface of micro-arc oxidation films. And the Ti-3Zr-2Sn-3Mo-25Nb biomedical alloy coated with active porous calcium-phosphate films shows better osteoinduction in vivo. 展开更多
关键词 β titanium alloy ti-3Zr-2Sn-3Mo-25Nb alloy OSTEOINDUCTION micro-arc oxidation surface modification
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Tribocorrosion behaviors of Ti-6Al-4V and Monel K500 alloys sliding against 316 stainless steel in artificial seawater 被引量:14
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作者 陈君 阎逢元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第6期1356-1365,共10页
The tribocorrosion behaviors of Ti-6Al-4V and Monel K500 alloys sliding against 316 stainless steel were investigated using a ring-on-block test rig in both artificial seawater and distilled water. It is found that fr... The tribocorrosion behaviors of Ti-6Al-4V and Monel K500 alloys sliding against 316 stainless steel were investigated using a ring-on-block test rig in both artificial seawater and distilled water. It is found that friction coefficients are in general larger in distilled water compared with seawater. The wear losses of Ti-6Al-4V and Monel K500 alloys are larger in seawater compared with distilled water. The mechanical action can destroy the passive film and increase the corrosion rate. The synergism effect between corrosion and wear occurs. The synergism action between corrosion and wear is related to the corrosion rate and with the increase of corrosion rate, the synergism becomes more important. 316 stainless steel suffers severe wear sliding against Monel K500 alloy compared with sliding against Ti-6Al-4V alloy in both distilled water and seawater. 展开更多
关键词 ti-6Al-4V alloy Monel K500 alloy seawater TRIBOCORROSION synergism effect
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Haemocompatibility of Ti-3Zr-2Sn-3Mo-25Nb biomedical alloy with surface heparinization using electrostatic self assembly technology 被引量:8
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作者 余森 于振涛 +3 位作者 韩建业 WANG Gui 牛金龙 Matthew S.Dargusch 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期3046-3052,共7页
The haemocompatibility of Ti-3Zr-2Sn-3Mo-25Nb biomedical alloy was studied after surface heparinization. A layer of sol-gel TiO2 films was applied on the alloy samples followed by active treatment in the bio-functiona... The haemocompatibility of Ti-3Zr-2Sn-3Mo-25Nb biomedical alloy was studied after surface heparinization. A layer of sol-gel TiO2 films was applied on the alloy samples followed by active treatment in the bio-functionalized solution for introducing the OH- and groups, and then the heparin was immobilized on the active TiO2 films through the electrostatic self assembly technology. It is shown that the heparinized films are mainly composed of anatase and rutile with smooth and dense surface. In vitro blood compatibility was evaluated by haemolysis test, clotting time and platelet adhesion behavior tests. The results show that the haemocompatibility of the alloy could be significantly improved by surface heparinization. 展开更多
关键词 ti-3Zr-2Sn-3Mo-25Nb alloy HAEMOCOMPATIBILITY HEPARINIZATION surface modification electrostatic self assembly
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Mechanical properties of strengthened surface layer in Ti-6Al-4V alloy induced by wet peening treatment 被引量:5
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作者 李康 付雪松 +2 位作者 陈国清 周文龙 李志强 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2868-2873,共6页
A modified surface layer was formed on Ti-6Al-4V alloy by wet peening treatment. The variations of the residual stress,nano-hardness and microstructure of the modified layer with depth from surface were studied using ... A modified surface layer was formed on Ti-6Al-4V alloy by wet peening treatment. The variations of the residual stress,nano-hardness and microstructure of the modified layer with depth from surface were studied using X-ray diffraction analysis,nano-indentation analysis, scanning electron microscopy and transmission electron microscopy observations. The results show thatboth the compressive residual stress and hardness decrease with increasing depth, and the termination depths are 160 and 80 μm,respectively. The microstructure observation indicates that within 80 μm, the compressive residual stress and the hardness areenhanced by the co-action of the grain refinement strengthening and dislocation strengthening. Within 80–160 μm, the compressiveresidual stress mainly derives from the dislocation strengthening. The strengthened layer in Ti-6Al-4V alloy after wet peeningtreatment was quantitatively analyzed by a revised equation with respect to a relation between hardness and yield strength. 展开更多
关键词 ti-6Al-4V alloy wet peening nano-hardness compressive residual stress local yield strength
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Effects of Al-Ti-B-RE grain refiner on microstructure and mechanical properties of Al-7.0Si-0.55Mg alloy 被引量:12
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作者 王雪姣 徐聪 +4 位作者 Arfan MUHAMMAD Shuji HANADA Hiroshi YAMAGATA 王文红 马朝利 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2244-2250,共7页
To investigate the effects of Al-Ti-B-RE grain refiner on microstructure and mechanical properties of Al-7.0Si-0.55Mg (A357) alloy, some novel Al-7.0Si-0.55Mg alloys added with different amount of Al-STi-1B-RE grain... To investigate the effects of Al-Ti-B-RE grain refiner on microstructure and mechanical properties of Al-7.0Si-0.55Mg (A357) alloy, some novel Al-7.0Si-0.55Mg alloys added with different amount of Al-STi-1B-RE grain refiner with different RE composition were prepared by vacuum-melting. The microstructure and fracture behavior of the AI-7.0Si-0.55Mg alloys with the grain refiners were observed by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), and the mechanical properties of the alloys were tested in mechanical testing machine at room temperature. The observation of AI-Ti-B-RE morphology and internal structure of the particles reveals that it exhibits a TiAl3/Ti2Al20RE core-shell structure via heterogeneous TiB2 nuclei. The tensile strength of Al-7.0Si-0.55Mg alloys with Al-5Ti-1B-3.0RE grain refiner reaches the peak value at the same addition (0.2%) of grain refiner. 展开更多
关键词 A357 alloy Al-5ti-1B grain refiner rare earth FRACTURE refining effect tensile strength
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Process parameters optimization of Ti-6Al-4V alloy sheet during hot stretch-creep forming 被引量:3
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作者 肖军杰 李东升 +4 位作者 李小强 丁盼 赵凯 黄烜昭 续明进 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期420-428,共9页
Hot stretch-creep forming (SCF) is a novel technique to produce hard-to-form thin-walled metal components. Comprehensively considering the analysis results of the springback angle, yield strength and microstructure,... Hot stretch-creep forming (SCF) is a novel technique to produce hard-to-form thin-walled metal components. Comprehensively considering the analysis results of the springback angle, yield strength and microstructure, four hot SCF process parameters including temperature, stretch velocity, post stretch percentage and dwelling time of a Ti-6Al-4V alloy sheet were optimized using an orthogonal experiment. The results reveal that temperature is the most important factor on springback angle. The yield strength of the deformed material in 0° direction increases, while those in directions of 45° and 90° fluctuate around the original value. After hot SCF, the shape of some a phases changes from short thin grains to long slender ones, and the microhardness changes very little. The optimized parameters with temperature of 700 ℃, stretch velocity of 5 mm/min, post stretch percentage of 2% and dwelling time of 8 min are achieved finally. 展开更多
关键词 ti-6Al-4V alloy hot stretch-creep forming SPRINGBACK orthogonal experiment OPTIMIZATION
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Ti-6242合金的热力学参数研究 被引量:5
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作者 刘瑞民 李四清 《热加工工艺》 CSCD 北大核心 2005年第12期18-19,23,共3页
利用Gleeble试验机研究了加热温度、应变速率对Ti-6242合金的变形抗力和塑性的影响;采用光学显微镜测试了在不同加热温度、变形量和退火温度条件下Ti-6242合金的琢晶粒度。结果表明:锻造或退火的加热温度超过α+β相区时,加热温度升高,... 利用Gleeble试验机研究了加热温度、应变速率对Ti-6242合金的变形抗力和塑性的影响;采用光学显微镜测试了在不同加热温度、变形量和退火温度条件下Ti-6242合金的琢晶粒度。结果表明:锻造或退火的加热温度超过α+β相区时,加热温度升高,晶粒长大非常迅速。 展开更多
关键词 ti-6242合金 热力学参数
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Influence of hydrogen content on room temperature compressive properties of Ti-6Al-4V alloy at high strain rate 被引量:6
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作者 袁宝国 于海平 李春峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2943-2951,共9页
Electromagnetic forming tests were done at room temperature to reveal the influence of hydrogen content on the compressive properties of Ti-6Al-4V alloy at high strain rate. Microstructure was observed to reveal the m... Electromagnetic forming tests were done at room temperature to reveal the influence of hydrogen content on the compressive properties of Ti-6Al-4V alloy at high strain rate. Microstructure was observed to reveal the mechanism of hydrogen-enhanced compressive properties. The experimental results indicate that hydrogen has favorable effects on the compressive properties of Ti-6Al-4V alloy at high strain rate. Compression of Ti-6Al-4V alloy first increases up to a maximum and then decreases with the increase of hydrogen content at the same discharge energy under EMF tests. The compression increases by 47.0% when 0.2% (mass fraction) hydrogen is introduced into Ti-6Al-4V alloy. The optimal hydrogen content for cold formation of Ti–6Al–4V alloy under EMF was determined. The reasons for the hydrogen-induced compressive properties were discussed. 展开更多
关键词 ti-6Al-4V alloy hydrogen content electromagnetic forming compressive property thermohydrogen processing
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热处理对Ti-6242S合金显微组织和性能的影响 被引量:5
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作者 脱祥明 岳耀峰 彭益群 《稀有金属》 EI CAS CSCD 北大核心 2001年第4期315-319,共5页
研究了简单退火、双重退火、固溶时效和形变热处理对Ti 6 2 42S合金显微组织和性能的影响 ,选择出双重退火热处理工艺 ,即在 90 0~ 980℃ ,1h ,空冷 +5 93℃ ,8h ,空冷处理的棒材 ,显微组织为等轴α +β转 。
关键词 热处理 显微组织 性能 钛合金 航空发动机
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Dynamic fracture of Ti-6Al-4V alloy in Taylor impact test 被引量:4
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作者 任宇 谭成文 +1 位作者 张静 王富耻 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第2期223-235,共13页
The dynamic fracture behaviors of Ti-6Al-4V alloy at high strain rate loading were investigated systemically through Taylor impact test, over the range of impact velocities from 145 m/s to 306 m/s. The critical impact... The dynamic fracture behaviors of Ti-6Al-4V alloy at high strain rate loading were investigated systemically through Taylor impact test, over the range of impact velocities from 145 m/s to 306 m/s. The critical impact velocity of fracture ranges from 217 m/s to 236 m/s. Smooth surfaces and ductile dimple areas were observed on the fracture surfaces. As the impact velocity reached 260 m/s, the serious melting regions were also observed on the fracture surfaces. Self-organization of cracks emerges when the impact velocity reaches 260 m/s, while some special cracks whose "tips" are not sharp but arc and smooth, and without any evidence of deformation or adiabatic shear band were also observed on the impact end surfaces. Examination of the sections of these special cracks reveals that the cracks expand along the two maximum shear stress directions respectively, and finally intersect as a tridimensional "stagger ridge" structure. 展开更多
关键词 ti-6Al-4V alloy dynamic fracture behavior adiabatic shear band Taylor impact test
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Wrinkling prediction in rubber forming of Ti-15-3 alloy 被引量:4
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作者 孙永娜 万敏 吴向东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期3002-3010,共9页
Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. Th... Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. The ABAQUS/Explicit code was utilized to predict the wrinkling behavior in the sheet metal forming of Ti-15-3 alloy sheets. In terms of the comparison of wrinkling behavior between the simulation and experiment of the Fukui's conical cup tests at room temperature, the sensitivities of wrinkling simulation to various input parameters were evaluated comprehensively and quantitatively. Prediction of wrinkling and influence of rubber hardness on the winkling behavior in the rubber forming of convex flange were investigated quantitatively and validated by the rubber forming experiments. The excellent agreements between the simulations and the experiments conIirmed the accuracy of the prediction. 展开更多
关键词 ti-15-3 alloy WRINKLING convex flange rubber forming quantitative analysis
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