Microstructure and mechanical properties of friction stir welding joint during post weld heat treatment with different zigzag lines

作     者：Zhi-Li Hu Qiu Pang Ming-Liang Dai 

作者机构：Hubei Key Laboratory of Advanced Technology of Automobile ComponentsWuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components TechnologyWuhan University of TechnologyWuhan 430070China School of Mechanical and Electrical EngineeringWuhan Donghu UniversityWuhan 430212China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2019年第38卷第11期

页      面：1070-1077页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51775397 and 51405358) the China Automobile Industry Innovation and Development Joint Fund(No.U1564202) the Program of the Ministry of Education of China for Introducing Talents of Discipline to Universities(No.B17034) the Open Fund of Shanghai Key Laboratory of Digital Manufacture for Thin-Walled Structures(No.2017002) 

主　　题：Friction stir welding Post weld heat treatment Zigzag line Mechanical properties 

摘      要：Zigzag line is a common defect in friction stir welding(FSW) *** formation mechanism of the zigzag line in Al-Cu alloy FSW joint and its influence on the microstructure and mechanical properties during post weld heat treatment(PWHT) were studied by scanning electron microscopy(SEM),microhardness and tensile *** is found that the occurrence of zigzag line for PWHT joint is determined by PWHT process which in nature depends on residual stress and thermal stress of FSW *** optimization of PWHT process to reduce the residual and thermal stress can trigger for the deterioration of mechanical properties of PWHT joints with zigzag *** obvious decrease of tensile properties is observed for T6-450 and T6-495 joints although zigzag line appears in the *** determines the sizes of zigzag line cracks and consequently determines the fracture location and characteristics of FSW joint.