文献类型：期刊文献

中文题名：Microstructure and Mechanical Properties of TC4 Titanium Alloy Joint Fabricated By Vortex Flow-Based Friction Stir Welding

作者：Xiaochao Liu[1,2];Pengyu Zhang[1];Wentao Li[1];Tao Ye[1];Chuanchao Xia[1];Tairui Zhang[1];Junmiao Shi[3];Jilin Xie[4];Zhonghua Ni[1,2]

机构：[1]School of Mechanical Engineering,Southeast University,Nanjing 211189,China;[2]Advanced Ocean Institute of Southeast University,Nantong 226010,China;[3]Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;[4]Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components,Nanchang Hangkong University,Nanchang 330063,China

年份：2024

卷号：37

期号：6

起止页码：183

中文期刊名：Chinese Journal of Mechanical Engineering

外文期刊名：中国机械工程学报(英文版)

收录：CSCD:【CSCD2023_2024】；

基金：Supported by National Natural Science Foundation of China(Grant Nos.52275316,51905437,52305149);Nantong Municipal Research Fund for Advanced Ocean Institute of Southeast University(Grant No.KP202409);Jiangxi Provincial Key Laboratory of Forming and Joining Technology for Aerospace Components(Grant No.EL202280325);State Administration for Market Regulation(Grant No.2023MK042);Jiangsu Provincial Administration for Market Regulation(Grant No.KJ2023003);Jiangsu Province Special Equipment Safety Supervision Inspection Institute(Grant Nos.KJ(Y)202429,KJ(YJ)2023001)。

语种：英文

中文关键词：FSW;Microstructure;Vortex flow;Weld formation;Mechanical performance;Titanium alloy

摘要：Tool wear is a critical challenge in titanium alloy friction stir welding(FSW).Vortex flow-based FSW(VFSW)is a potential solution for this issue because the VFSW process uses a similar material to the base metal as the tool.In this study,TC4 titanium alloy was welded by VFSW for the first time.Parameter optimization of the vortex flow formation is first done,and then the weld formation and the joints'microstructure and mechanical performance are investigated at different traversing speeds.The results prove that the plunging velocity is the dominant factor in the vortex depth.A lower plunging speed is beneficial for the formation of a deeper vortex.Full penetration is achieved at traversing speeds of 50–120 mm/min at 300 r/min.At welding speed above 130 mm/min,insufficient penetration defects occur.In the heat affected zone,grain coarsening andβ-phase volume fraction increase arise,whereas,in the weld nugget,anα+βlamellar structure emerges.Under the optimized parameters,the joint tensile strength is nearly 98%of the base material,but the elongation decreases significantly.The oxides drawn into the weld by the vortex at the junction between the vortex and the base material are the main reason for the small elongation.This study proves that the VFSW process is feasible for titanium alloys.