激光快速成型TC4合金显微组织及力学性能
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摘要
采用金相显微镜、扫描电镜、电子拉伸机等,研究了激光快速成型TC4合金沉积态在平行沉积方向和垂直沉积方向的组织和力学性能.结果表明:激光快速成型TC4合金沉积态宏观组织沿沉积方向生长的粗大β柱状晶呈明暗相间的条带状结构,具备典型的魏氏组织特征;垂直沉积方向的强度比平行沉积方向的强度高,但塑性低;合金断口为韧窝状断口,垂直沉积方向的断口韧窝尺寸比平行沉积方向的小.
Microstructures and mechanical properties of laser rapid prototyping deposited TC4 alloy in the parallel and vertical directions were studied by metallographic microscope,scanning electron microscopy and electronic tensile testing machine. The results showed that the β grains growing in the deposited direction are coarse and columnar,which shows a bright and dark strip structure and is typical Widmanstatten structure. The strength vertical to deposition direction is higher than that parallel with deposition direction,but the plasticity is low. The fracture of the alloy is dimple fracture,and the size of the dimples on the fracture vertical to deposition direction is smaller than that parallel with deposition direction.
Microstructures and mechanical properties of laser rapid prototyping deposited TC4 alloy in the parallel and vertical directions were studied by metallographic microscope,scanning electron microscopy and electronic tensile testing machine. The results showed that the β grains growing in the deposited direction are coarse and columnar,which shows a bright and dark strip structure and is typical Widmanstatten structure. The strength vertical to deposition direction is higher than that parallel with deposition direction,but the plasticity is low. The fracture of the alloy is dimple fracture,and the size of the dimples on the fracture vertical to deposition direction is smaller than that parallel with deposition direction.
引文
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[2]Song J L,Li Y T,Deng Q L,et al.Rapid prototyping manufacturing of silica sand patterns based on selective laser sintering[J].Journal of Materials Processing Technology,2007,187/188:614-618.
[3]Hollander D A,von Walter M,Wirtz T,et al.Structural,mechanical and in vitro characterization of individually structured Ti-6Al-4V produced by direct laser forming[J].Biomaterials,2006,27(7):955-963.
[4]Kinemuchi Y,Mikami M,Terasaki I,et al.Rapid synthesis of thermoelectric compounds by laser melting[J].Materials&Design,2016,106:30-36.
[5]Miranda R M,Lopes G,Quintino L,et al.Rapid prototyping w ith high pow er fiber lasers[J].Materials&Design,2008,29(10):2072-2075.
[6]尚晓峰,韩冬雪,于福鑫.金属粉末激光快速成型技术及发展现状[J].机电产品开发与创新,2010,23(5):14-16.(Shang Xiao-feng,Han Dong-xue,Yu Fu-xin.Metal powder laser shaping technology and development status[J].Development&Innovation of Machinery&Electrical Products,2010,23(5):14-16.)
[7]黄秋实,李良琦,高彬彬.国外金属零部件增材制造技术发展概述[J].国防制造技术,2012(5):28-31.(Huang Qiu-shi,Li Liang-qi,Gao Bin-bin.Overview of foreign metal parts manufacturing technology development[J].Defense Manufacturing Technology,2012(5):28-31.)
[8]杨永强,王迪,吴伟辉.金属零件选区激光熔化直接成型技术研究进展[J].中国激光,2011,38(6):54-64.(Yang Yong-qiang,Wang Di,Wu Wei-hui.Research progress of direct manufacturing of metal parts by selective laser melting[J].Chinese Journal of Lasers,2011,38(6):54-64.)
[9]柳建,雷争军,顾海清,等.3D打印行业国内发展现状[J].制造技术与机床,2015(3):17-21,25.(Liu Jian,Lei Zheng-jun,Gu Hai-qing,et al.Domestic developing status of 3D printing in China[J].Manufacturing Technology&Machine Tool,2015(3):17-21,25.)
[10]Qiu C,Ravi G A,Dance C,et al.Fabrication of large Ti-6Al-4V structures by direct laser deposition[J].Journal of Alloys&Compounds,2015,629:351-361.
[11]Liu C M,Tian X J,Tang H B,et al.Microstructural characterization of laser melting deposited Ti-5Al-5M o-5V-1Cr-1Fe nearβtitanium alloy[J].Journal of Alloys&Compounds,2013,572:17-24.
[12]Carroll B E,Palmer T A,Beese A M.Anisotropic tensile behavior of Ti-6Al-4V components fabricated w ith directed energy deposition additive manufacturing[J].Acta Materialia,2015,87:309-320.
[13]Zhu Y,Tian X,Li J,et al.The anisotropy of laser melting deposition additive manufacturing Ti-6.5Al-3.5M o-1.5Zr-0.3Si titanium alloy[J].Materials&Design,2015,67:538-542.
[14]Antonysamy A A,Meyer J,Prangnell P B.Effect of build geometry on theβ-grain structure and texture in additive manufacture of Ti-6Al-4V by selective electron beam melting[J].Materials Characterization,2013,84:153-168.