Mechanical properties of electron beam welded dissimilar joints of TC17 and Ti60 alloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第10期
论文作者：Chao Cheng Bingbing Yu Zhiyong Chen Jianrong Liu QingjiangWang
文章页码：1859 - 1866
摘 要：Microstructure, hardness, tensile and high cycle fatigue（HCF） properties of the welded dissimilar joints of Ti60 and TC17 titanium alloys had been investigated in this study. A significant microstructural change was observed to occur after welding, with rod-like α and β phases in the fusion zone（FZ）, equiaxed αphases, fine α laths and β phases in the heat-affected zone（HAZ） of TC17 side and acicular martensiteα’ phases+ "ghost" α phases in the HAZ of Ti60 side. The microhardness across the joints exhibited an inhomogeneous distribution with the highest hardness of 404 HV in FZ and the lowest hardness of304 HV in base material（BM） of Ti60. All the joints tested in tension fractured at BM of Ti60 side.Fatigue limits of the joints at 107 cycles were 425 MPa at room temperature and 380 MPa at 400℃,respectively. Welding micropores were found to be the main source of fatigue crack initiation.
Chao Cheng1,2，Bingbing Yu1，Zhiyong Chen1,2，Jianrong Liu1,2，QingjiangWang1,2
1. Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, University of Science and Technology of China
摘 要：Microstructure, hardness, tensile and high cycle fatigue（HCF） properties of the welded dissimilar joints of Ti60 and TC17 titanium alloys had been investigated in this study. A significant microstructural change was observed to occur after welding, with rod-like α and β phases in the fusion zone（FZ）, equiaxed αphases, fine α laths and β phases in the heat-affected zone（HAZ） of TC17 side and acicular martensiteα’ phases+ "ghost" α phases in the HAZ of Ti60 side. The microhardness across the joints exhibited an inhomogeneous distribution with the highest hardness of 404 HV in FZ and the lowest hardness of304 HV in base material（BM） of Ti60. All the joints tested in tension fractured at BM of Ti60 side.Fatigue limits of the joints at 107 cycles were 425 MPa at room temperature and 380 MPa at 400℃,respectively. Welding micropores were found to be the main source of fatigue crack initiation.
关键词：
