中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 10 October 2016 |
（1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan 030024, China;
3. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China）
Abstract:Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechanism of heat generation was discussed. Fatigue limit of the welded joint was predicted and the fatigue damage was also assessed based on the evolution of the temperature and hotspot zone on the specimen surface during fatigue tests. The presented results show that infrared thermography can not only quickly predict the fatigue behavior of the welded joint, but also qualitatively identify the evolution of fatigue damage in real time. It is found that the predicted fatigue limit agrees well with the conventional S-N experimental results. The evolution of the temperature and hotspot zone on the specimen surface can be an effective fatigue damage indicator for effective evaluation of magnesium alloy electron beam welded joint.
Key words: magnesium alloy; electron beam welded joint; fatigue behavior; infrared thermography
