激光沉积与热轧复合制造TC4钛合金组织性能的研究  

Study on Microstructure and Properties of TC4 Titanium Alloy Fabri‐cated by Laser Additive Manufacturing and Hot Rolling

作　　者：刘祥宇 王辰阳 井志成 高飞 徐国建[3] 邢飞 LIU Xiangyu;WANG Chenyang;JING Zhicheng;GAO Fei;XU Guojian;XING Fei(Liaoning additive manufacturing industry technology Research Institute Co.,Ltd.,Shenyang 110200,China;Shenyang Zhongke Raycham Science and Technology Co.,Ltd.,Shenyang 110200,China;School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Nanjing Zhongke Raycham Laser Technology Co.,Ltd.,Nanjing 210038,China)

机构地区：[1]辽宁增材制造产业技术研究院有限公司,辽宁沈阳110200 [2]沈阳中科煜宸科技有限公司,辽宁沈阳110200 [3]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [4]南京中科煜宸激光技术有限公司,江苏南京210038

出　　处：《电焊机》2022年第5期99-105,共7页Electric Welding Machine

基　　金：科技部“科技助力经济2020”重点专项(2020YFB1108500ZL)。

摘　　要：采用激光沉积与热轧复合制造钛合金零部件,可在有效提高原材料利用率的同时,提高整体零部件的生产效率。基于激光同轴送粉技术在TC4热轧态板材上沉积制造TC4钛合金零部件,通过体视显微镜、光学显微镜、扫描电子显微镜、维氏硬度测试仪以及万能试验机对TC4试件进行微观组织观察与力学性能分析。结果表明,复合制造的TC4试件中存在热轧板材区、结合区域以及沉积制造区域,其中热轧板材区与结合区域主要由等轴晶组成,沉积制造区域则由外延生长的柱状晶构成。结合区域的维氏硬度约为375 HV,略高于热轧板材区(340 HV)与沉积制造区(355 HV)。复合制造拉伸试件在垂直沉积方向的抗拉性能(1029 MPa)优于平行沉积方向(955 MPa),而平行沉积方向的延伸率(19.8%)优于垂直沉积方向(12.0%)。Laser additive manufacturing and hot rolling composite manufacturing of titanium alloy parts can effectively im‐prove the utilization rate of raw materials and improve the production efficiency of the whole parts.In this paper,TC4 was deposited on TC4 hot-rolled sheet by laser coaxial powder feeding technology,and the microstructure and properties of TC4 samples were analyzed by stereo microscope,optical microscope,scanning electron microscope,Vickers hardness tester and universal testing machine.The results show that there are hot rolled plate region,bonding region and deposition manufactur‐ing region in the composite fabricated TC4 samples.The hot rolled plate region and bonding region are mainly composed of equiaxed grains,while the deposition manufacturing region is composed of epitaxial columnar grains.The Vickers hardness of bonded area is about 375 HV,which is slightly higher than that of hot rolled area(340 HV)and deposited area(355 HV).The tensile properties of composite fabricated specimens in vertical deposition direction(1029.0 MPa)are better than those in parallel deposition direction(955.0 MPa),and the elongation in parallel deposition direction(19.8%)is better than that in vertical deposition direction(12.0%).

关 键 词：TC4钛合金 激光沉积制造 热轧复合制造 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]