激光选区熔化制备Ti-15Mo合金微观结构和力学性能的各向异性  

Anisotropy of Microstructure and Mechanical Properties of Ti-15Mo AlloyPrepared by Selective Laser Melting

作　　者：肖湘睿 陈荐 周立波 李聪[1] XIAO Xiangrui;CHEN Jian;ZHOU Libo;LI Cong(College of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410114

出　　处：《机械工程材料》2024年第3期14-22,共9页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51975061)。

摘　　要：采用激光选区熔化(SLM)技术在不同构建方向(与水平方向成0°,30°,45°,60°,90°)下制备Ti-15Mo合金,分析了其微观结构和力学性能的各向异性。结果表明:当构建方向由0°变为90°时,合金的织构取向变化为(001)→(101)→(111);0°和90°构建方向的合金中2°~10°小角度晶界的体积分数较低;0°,30°,45°,60°和90°构建方向的合金的平均晶粒尺寸分别为59.95,33.47,99.98,42.63,72.41μm,平均显微硬度分别为313.92,327.29,294.11,327.48,311.67 HV;0°,45°,60°,90°构建方向制备的合金的抗拉强度分别为866.35,898.78,1055.97,913.7 MPa,屈服强度分别为716.40,767.98,1027.45,808.83 MPa,断后伸长率分别为14.00%,18.97%,12.51%和14.29%。不同构建方向的SLM成形合金存在力学性能各向异性。Ti-15Mo alloys were prepared by laser selective melting(SLM)technique in different building directions(0°,30°,45°,60°,90°form horizontal direction)and the anisotropy of microstructure and mechanical properties were studied.The results show that the texture orientation change was(001)→(101)→(111)when the building direction changed from 0°to 90°.The volume fraction of grain boundaries at low angles of 2°-10°in the alloys in 0°and 90°building directions was low.The average grain sizes of the alloys in the building directions of 0°,30°,45°,60°and 90°were 59.95,33.47,99.98,42.63,72.41μm,respectively,and the average microhardnesses were 313.92,327.29,294.11,327.48,311.67 HV,respectively.The tensile strengths of the alloys in the building directions of 0°,45°,60°,90°were 866.35,898.78,1055.97,913.70 MPa,and the yield strengths were 716.40,767.98,1027.45,808.83 MPa,and the percentage elongations after fracture were 14.00%,18.97%,12.51%and 14.29%,respectively.The mechanical properties of SLM alloys in different building directions were anisotropic.

关 键 词：激光选区熔化 Ti-15Mo合金 各向异性 微观结构 力学性能 

分 类 号：TG115.5[金属学及工艺—物理冶金]