焊后热处理对309L不锈钢焊缝金属性能的影响  

Influence of Post-Weld Heat Treatment on Mechanical Properties in 309L Stainless Steel Weld Metals

作　　者：顾佳磊 张文杨 丁阳 GU Jia - lei ZHANG Wen - yang DING Yang(Shanghai Electric Nuclear Power Equipment Co. , Ltd. , Shanghai 201306, China Shanghai Engineering Research Center of Nuclear Power Equipment Welding and Examination ,Shanghai 201306, China)

机构地区：[1]上海电气核电设备有限公司,上海201306 [2]上海核电装备焊接及检测工程技术研究中心,上海201306

出　　处：《压力容器》2017年第7期5-10,共6页Pressure Vessel Technology

摘　　要：研究焊后热处理(PWHT)对309L焊缝金属的力学性能及显微组织的影响。结果表明,焊后热处理的保温时间对309L焊缝金属的力学性能影响很大,特别是韧性和延性;随着焊后热处理的保温时间的增加,其显微组织中的σ相含量逐渐增加,铁素体的含量逐渐减少;本试验条件下,焊后热处理保温时间在24 h之内时,对309L熔敷金属的断后伸长率没有明显的影响。The effects of post-weld heat treatment（PWHT） on the mechanical properties and microstruc- ture in 309L weld metals were studied. The results show that：The heat preservation time of PWHT has great influence on the mechanical properties of 309L weld metals, especially for toughness and ductility; The content of σ phase in the microstructure increases with the increasing of the heat preservation time after heat treatment;Under this experiment condition, PWHT within 24 hours has no obvious effect on the elongation of the tensile test in 309L weld metals.

关 键 词：309L焊缝金属 焊后热处理 Σ相 

分 类 号：TH49[机械工程—机械制造及自动化] TH142[一般工业技术—材料科学与工程]