罗炯,张十庆,王宏,刘洋

• 1:重庆材料研究院有限公司
• 2:国家仪表功能材料工程技术研究中心
• 3:耐腐蚀合金重庆市重点实验室

摘要(Abstract)：

对核电接管安全端异种金属焊接接头(SA508-3-308L/309L-316L)进行拉伸、硬度试验及显微组织观察,确定接头拉伸断裂位置并研究断裂位置产生原因。结果表明:焊缝在接头具有最低强度及塑性,断裂位置为焊缝隔离层;隔离层中铁素体大部分呈板条状,因此隔离层裂纹扩展穿透两相界面相对较少,裂纹扩展阻力更小;隔离层相对于对接焊缝硬度更高,隔离层具有高的位错密度,因此残余应力大,导致硬度升高,降低隔离层临界塑性变形能力;焊缝与SA508-3钢为低强度匹配,高的三轴应力及塑性应变主要分布在隔离层内,裂纹更易萌生。

关键词(KeyWords)： 异种金属焊接;拉伸;断裂位置;核电接管安全端;308L/309L

Abstract:

Keywords:

基金项目(Foundation): 工业转型升级强基工程(TC150B5C0/20);; 重庆市重点产业共性关键技术创新专项(cstc2015zdcy-ztzx50002)

作者(Author): 罗炯,张十庆,王宏,刘洋

DOI: 10.13289/j.issn.1009-6264.2017-0462

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