会议专题

Effect of Post-Weld Heat Treatment on the Fatigue Properties of Dissimilar Titanium Alloy Joints

  The purpose of this study was to characterize the microstructural change and fatigue resistance of electron beam welded (EBWed) dissimilar joints between Ti-6Al-4V and BT9 (Ti-6.5Al-3.5Mo-1.5Zr) alloys after two types of post-weld heat treatment (PWHT), namely only aging and solution treatment followed by aging (STA). It was observed that no significant microstructural change occurred in the FZ after only aging and the high hardness in the fusion zone (FZ) remained, while coarse acicular α occurred in the FZ in the STA condition, leading to a reduced hardness. Both types of post-welded joints were cyclically stable at lower strain amplitudes of 0.2-0.6%, and exhibited cyclic softening at higher strain amplitudes of 0.8%-1.2%. As the total strain amplitude increased, cyclic stress amplitude increased, while the fatigue life decreased. Fatigue crack initiation occurred from the specimen surface or near-surface defects and propagation was characterized mainly by the formation of characteristic fatigue striations.

Titanium alloy Post-weld heat treatment Microstructure evolution Strain-controlled fatigue.

S.Q. Wang J.H. Liu D.L. Chen

Department of Mechanical and Industrial Engineering,Ryerson University,Toronto,Ontario M5B 2K3,Canad State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xian 710072 Department of Mechanical and Industrial Engineering,Ryerson University,Toronto,Ontario M5B 2K3,Canad

国际会议

第13届国际断裂大会(ICF2013)

北京

英文

1-9

2013-06-16(万方平台首次上网日期,不代表论文的发表时间)