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作者机构:State Key Lab of Hydraulic Engineering Simulation and SafetySchool of Materials Science & EngineeringTianjin University Tianjin Key Laboratory of Advanced Joining TechnologySchool of Materials Science and EngineeringTianjin University
出 版 物:《Journal of Materials Science & Technology》 (材料科学技术(英文版))
年 卷 期:2018年第34卷第5期
页 面:756-766页
核心收录:
学科分类:080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
基 金:financially supported by the National Natural Science Foundation of China (Grant Nos.51325401 and U1660201) the National Magnetic Confinement Fusion Energy Research Project (Grant No.2015GB119001)
主 题:Friction stir welding Reduced activation ferritic/martensitic steel Microstructure evolution Impact toughness
摘 要:In this study,the microstructures and mechanical properties of 9%Cr reduced activation ferritic/martensitic(RAFM) steel friction stir welded joints were *** a W-Re tool is used,the recommended welding parameters are 300 rpm rotational speed,60 mm/min welding speed and10 kn axial *** stir zone(SZ),austenite dynamic recrystallization induced by plastic deformation and the high cooling rates lead to an obvious refinement of prior austenite grains and martensite *** microstructure in SZ contains lath martensite with high dislocation density,a lot of nano-sized MX and M3C phase particles,but almost no M23C6 *** thermal mechanically affect zone(TMAZ)and heat affect zone(HAZ),refinement of prior austenite and martensitic laths and partial dissolution of M(23)C6 precipitates are obtained at relatively low rotational ***,with the increase of heat input,coarsening of martensitic laths,prior austenite grains,and complete dissolution of M23C6 precipitates are *** toughness of SZ at-20℃ is slightly lower than that of base material(BM),and exhibits a decreasing trend with the increase of rotational speed.