激光选区熔化成形TC4钛合金激光焊接头组织与力学性能  

Microstructure and Mechanical Properties of Laser Welded Joints of SLM TC4 Alloys

作　　者：田天 崔丽[1] 贺定勇[1] 吴旭[1] 郭星晔 Tian Tian;Cui Li;He Dingyong;Wu Xu;Guo Xingye(Institute of Welding and Surface Engineering Technology,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学焊接与表面工程技术研究所,北京100124

出　　处：《航空科学技术》2022年第4期102-107,共6页Aeronautical Science & Technology

基　　金：航空科学基金(20200042075001)。

摘　　要：对3mm厚激光选区熔化成形(SLM)TC4钛合金对接接头进行了激光焊接工艺试验,研究了80J/mm和100J/mm两种能量输入对接头焊缝成形、微观组织及接头力学性能的影响。结果表明,在两种不同焊接能量输入条件下,激光焊接SLM成形TC4钛合金获得良好的焊缝成形,焊缝区的平均显微硬度分别为388.7HV及403.3HV,高于SLM成形TC4钛合金母材(370.6HV),接头的抗拉强度分别为1027MPa及1018MPa,略低于母材(1201MPa)。Laser welding of TC4 alloys prepared by selective laser melting(SLM) is carried out on butt joints of 3mm thickness. This paper studies the influences of two energy inputs of 80J/mm and 100J/mm on the weld appearance,microstructures and mechanical properties of the welded joints. The results show that the laser welding of SLM TC4 alloys achieves sound welded shape under the conditions of two welding energy inputs. The average microhardness value of the weld metal are 388.7HV and 403.3HV, respectively, which are both higher than that of BM. The ultimate tensile strength of the welded joints is 1027MPa and 1018MPa, respectively, which are a little lower than that of BM(1201MPa).

关 键 词：激光选区熔化 TC4钛合金 激光焊接 接头组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]