Development of nuclear grade E309L-16 austenitic stainless steel electrode

核级E309L-16奥氏体不锈钢焊条的研制 Development of nuclear grade E309L-16 austenitic stainless steel electrode 王猛 WANG Meng 1 2 first-author 邹小平 ZOU Xiaoping 3 陈波 CHEN Bo 1 2 陈佩寅 CHEN Peiyin 1 2 张学刚 ZHANG Xuegang 1 2 哈尔滨威尔焊接有限责任公司 哈尔滨威尔焊接有限责任公司 Harbin Well Welding Co.,Ltd. Harbin Well Welding Co.,Ltd. 哈尔滨焊接研究院有限公司 哈尔滨焊接研究院有限公司 Harbin Welding Institute Limited Company Harbin Welding Institute Limited Company 中广核工程有限公司 中广核工程有限公司 China Nuclear Power Engineering Co.,Ltd. China Nuclear Power Engineering Co.,Ltd. 核岛主设备核心部件使用的E309L-16奥氏体不锈钢焊条长期依赖进口,严重制约中国核电事业的发展。研究了焊态铁素体含量对熔敷金属经608℃×40 h热处理后断后伸长率的影响,对焊态铁素体含量大于12%的热处理态熔敷金属微观组织进行分析,并研究了热输入和热处理保温时间对熔敷金属拉伸性能的影响,试验结果表明:当铁素体含量大于12%时,δ-铁素体分解很不均匀,导致熔敷金属断后伸长率波动较大,可能会出现断后伸长率小于18%;当铁素体含量增大至17.8%时,δ-铁素体大部分发生分解,并有σ相析出,是导致脆断的原因;热输入和热处理保温时间对熔敷金属的断后伸长率影响不大。 E309L-16 austenitic stainless steel electrodes for core components of nuclear island still rely on import,which severely restricts the development of nuclear power industry in China. The effect of the as-welded ferrite content on the elongation of the deposited metal after heat treatment at 608℃×40 h is studied. The microstructure of heat treated deposited metal with more than 12% as-welded ferrite is analyzed,and the effect of the heat input and heat preservation time on the tensile properties of the deposited metal is studied. The test results show that when the ferrite content is over 12%,the δ-ferrite decomposition is very uneven,which causes the elongation of the deposited metal after fracture to fluctuate greatly. The elongation may be less than 18%. When the ferrite content increases to 17.8%,most of the δ-ferrite decompose and the σ phase is precipitated,which is the cause of brittle fracture. The heat input and heat preservation time have little effect on the elongation of the deposited metal. 奥氏体不锈钢 焊条 热处理 熔敷金属拉伸性能 核电 austenitic stainless electrode heat treatment tensile properties of the deposited metal nuclear power TG422.1 2022-03-08 6 51