能量密度对直接激光沉积Ti-6Al-4V合金组织和性能的影响  

Effect of energy density on microstructure and properties of Ti-6Al-4V alloys prepared by direct laser deposition

作　　者：张弈 李传维[1] 李克 顾剑锋[1,3] ZHANG Yi;LI Chuan-wei;LI Ke;GU Jian-feng(Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China;AECC South Industry Co Ltd,Zhuzhou 412002,China;Institute of Materials Modification and Modelling,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学上海市激光制造与材料改性重点实验室,上海200240 [2]中国航发南方工业有限公司,湖南株洲412002 [3]上海交通大学材料科学与工程学院材料改性与数值模拟研究所,上海200240

出　　处：《材料热处理学报》2023年第10期114-120,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(52171042)。

摘　　要：采用直接激光沉积(DLD)技术制备了Ti-6Al-4V合金,使用X射线衍射、扫描电镜、拉伸实验机等研究了不同能量密度(50、62.5和75 J/mm^(3))对DLD成型Ti-6Al-4V合金显微组织和力学性能的影响。结果表明:随着能量密度的升高,可以得到3种典型的显微组织:α′马氏体组织、魏氏组织、层片状(α+β)组织。在能量密度为75 J/mm^(3)时,DLD成型Ti-6Al-4V合金具有较好的强塑性匹配:屈服强度达到1199 MPa,抗拉强度达到1220 MPa,断裂伸长率为11.6%。该合金强度和塑性提升的原因可能与层片状(α+β)组织中的纳米孪晶有关。Ti-6Al-4V alloy was prepared by direct laser deposition(DLD)technology,and the effect of different energy densities(50,62.5 and 75 J/mm3)on microstructure and mechanical properties of the Ti-6Al-4V alloy was studied by means of X-ray diffraction,scanning electron microscopy and tensile testing machine.The results show that as the energy density increases,three kinds of typical microstructure can be obtained:α′martensite structure,widmanstatten structure and(α+β)lamellae structure.When the energy density is 75 J/mm3,the DLD formed Ti-6Al-4V alloy has a good strength plastic matching:the yield strength reaches 1199 MPa,the tensile strength reaches 1220 MPa,and the elongation is 11.6%.The reason for the increase in strength and plasticity of the alloy may be related to the nanotwins in the(α+β)lamellar structure.

关 键 词：TI-6AL-4V合金 直接激光沉积 能量密度 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]