摘要
采用电子束选区熔化针对不同成形方向进行打印,利用扫描电子显微镜(SEM)和金相显微镜(OM)研究了电子束选区熔化成形Ti-6Al-4V合金的组织特征,获得了成形后Ti-6Al-4V合金力学性能,揭示了成形方向选择对力学性能的影响规律。结果表明:横向打印产品材料抗拉强度能够达到986 MPa、屈服强度能够到达880 MPa、延伸率能够到达11.2%,明显优于纵向打印产品材料的性能;横向打印材料在打印过程中冷却速度较快,β相先转化成α′马氏体,最后分解为α+β相组成的网篮组织;纵向打印材料在打印过程中材料被反复加热,最终形成魏氏组织(过热组织)。
Electron beam selective melting was used to print in different forming directions.Scanning electron microscope(SEM)and metallographic microscope(OM)were used to study the microstructure characteristics of Ti-6Al-4V alloy formed by electron beam selective melting.The mechanical properties of Ti-6Al-4V alloy after forming were obtained,and the influence of forming direction on mechanical properties of the alloy was revealed.The results show that the tensile strength,yield strength and elongation of the transverse printing products can reach 986 MPa,880 MPa and 11.2%respectively,which are obviously better than those of the vertical printing products.The materials cool down faster in the transverse printing process,and the phase is transformed fromβtoα′martensite and then decomposed into microstructure consisting ofα+βphases.The materials are heated repeatedly during the vertical printing process,resulting in Widmanstaten structure(superheated structure).
作者
孙宝福
陈家琪
张瑞
莫力林
黄星光
Sun Baofu;Chen Jiaqi;Zhang Rui;Mo Lilin;Huang Xingguang(College of Mechanical and Control Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;Guilin Shida Technology Co.,Ltd.,Guilin 541004,Guangxi,China)
出处
《钢铁钒钛》
CAS
北大核心
2021年第2期43-47,90,共6页
Iron Steel Vanadium Titanium
基金
桂林理工大学大学生创新创业训练计划项目。
