在役15Cr1Mo1V钢管道焊接接头显微组织与力学性能研究  

Study on microstructure and mechanical properties of welded joints of 15Cr1Mo1V steel pipeline in service

作　　者：王艳松 刘福广[1] 米紫昊[1] 韩天鹏 张磊 杨二娟[1] 巴特尔 Wang Yansong;Liu Fuguang;Mi Zihao;Han Tianpeng;Zhang Lei;Yang Erjuan;Ba Teer(Xi'an Thermal Engineering Research Institute Co.,Ltd.,Xi'an 710054,Shaanxi,China;Yimin Power Plant of Huaneng Yimin Coal Power Co.,Ltd.,Hulunbuir 021130,Inner Mongolia,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]华能伊敏煤电有限责任公司伊敏电厂,内蒙古呼伦贝尔021130

出　　处：《钢铁钒钛》2024年第2期198-204,共7页Iron Steel Vanadium Titanium

基　　金：中国华能集团科技项目(HNKJ20-H47,TN-20-TYK09)。

摘　　要：以某电厂运行约13万h的15Cr1Mo1V钢高温再热蒸汽管道焊接接头作为研究对象,对其显微组织、硬度、拉伸、冲击和失效位置进行了研究分析。结果表明,服役管道焊接接头各区域均有多边形铁素体和析出物,组织出现一定的老化现象。焊接接头各区域硬度差异明显,焊缝中呈现多层多道焊典型的回火效应,盖面焊缝处硬度值普遍较高。焊接接头各区域拉伸和冲击结果均表明室温和高温下焊缝的强度均优于母材,但塑性和韧性均相对较差,特别是高温环境下焊缝的塑性和韧性下降较多;焊接接头拉伸和冲击断口显示母材断口中的韧窝数量多且韧窝较深,而焊缝中由于第二相的析出,尽管拉伸强度有所提高,但其均明显降低。The microstructure,hardness,tensile strength,impact and failure position of the welded joint of 15Cr1Mo1V steel for high temperature reheat steam pipeline,which has been operated for about 130000hours in a power plant,were studied and analyzed.The results show that there are the polygonal ferrite and precipitates in each micro zones of the pipeline joint in service,and the microstructure appears the certain aging phenomenon.The hardness of each micro zones of the joint is obviously different,and the typical tempering effect of multi-layer and multi pass welding appears in the weld,and the hardness of the cover weld is generally high.The tensile and impact results of each micro zones of the welded joint show that the strengths of the weld at room temperature and elevated temperature are better than those of the base metal,but the plasticity and toughness are relatively poor,especially at elevated temperature,the plasticity and toughness of the weld decrease more.The tensile and impact fracture surfaces of the welded joint show that there are many dimples and deep dimples in the fracture surface of the base metal.However,due to the precipitation of the second phase in the weld,although the tensile strength is improved,its plasticity and toughness significantly declined.

关 键 词：15Cr1Mo1V钢 高温再热蒸汽管道 焊接接头 显微组织 力学性能 

分 类 号：TF76[冶金工程—钢铁冶金] TG441.7[金属学及工艺—焊接]