Effects of Post-weld Heat Treatment on Microstructure, Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

作     者：Deng-Kui Zhang Guo-Qing Wang Ai-Ping Wu Ji-Guo Shan Yue Zhao Tian-Yi Zhao Dan-Yang Meng Jian-Ling Song Zhong-Ping Zhang 

作者机构：Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China China Academy of Launch Vehicle TechnologyBeijing 100076China State Key Laboratory of TribologyTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing TechnologyMinistry of EducationTsinghua UniversityBeijing 100084China Tianjin Long March Launch Vehicle Manufacturing Co.Ltd.Tianjin 300462China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2019年第32卷第6期

页      面：684-694页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Joint Funds of the National Natural Science Foundation of China (Grant No. U1637601) 

主　　题：2219 Aluminum alloy Tungsten inert gas arc welding Post-weld heat treatment Weld reinforcement Digital image correlation technique 

摘      要：In as-welded state,each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second *** the post-weld heat treatment,both the amount and the size of the eutectic structure orθphases ***,both the Cu content inα-Al matrix and the microhardness increased to a similar level in each region of the joint,and the tensile strength of the entire joint was greatly ***-weld heat treatment played the role of solid solution strengthening and aging *** the post-weld heat treatment,the weld performance became similar to other regions,but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff *** joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties,and the specimens randomly crack in the weld zone.