Effects of zonal heat treatment on residual stresses and mechanical properties of electron beam welded TC4 alloy plates

作     者：胡美娟 刘金合 

作者机构：School of Materials Science and EngineeringNorthwestern Polytechnical University 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2009年第19卷第2期

页      面：324-329页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0813[工学-建筑学] 0802[工学-机械工程] 0814[工学-土木工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

主　　题：电子束焊接 残余应力 力学性能 应力和 TC4 热处理 金板 纬向 

摘      要：Zonal heat treatment(ZHT) was conducted in situ to 14.5 mm-thick TC4 alloy plates by means of defocused electron beam after welding. The effects of ZHT on residual stresses,microstructures and mechanical properties of electron beam welded joints were investigated. Experimental results show residual stresses after welding are mostly relieved through ZHT,and the maximum values of longitudinal tensile stress and transverse compressive stress reduce by 76% and 65%,respectively. The tensile strength and ductility of welded joint after ZHT at slow scanning velocity are improved because of the reduction of residual stress and the microstructural changes of the base and weld metal. ZHT at fast scanning velocity is detrimental to the ductility of welded joint,which is resulted from insufficiently coarsened alpha phase in the fusion zone and the appearance of martensite in the base metal.