长期服役15Cr1Mo1V补焊细晶区组织及硬度与冷却速度的关系  

Relationship between microstructure,harduess and coding rate in the fine grained region of long term service 15Cr1Mo1V by repair welding

作　　者：肖世俊 李霄[1] 张正华 薛海洋 XIAO Shijun;LI Xiao;ZHANG Zhenghua;XUE Haiyang(College of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi pro.,China;China Railway Baoji Bridge Group Co.,Ltd.,Baoji 721006,Shaanxi pro.,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]中铁宝桥集团有限公司,陕西宝鸡721006

出　　处：《焊接技术》2025年第3期35-39,I0002,共6页Welding Technology

摘　　要：通过焊接热模拟试验对某电厂运行约1.3×10^(5) h的15Cr1Mo1V再热蒸汽管道材料进行试验。通过对其焊接细晶区微观组织与硬度的研究,建立其补焊焊接细晶区的SH-CCT曲线。结果表明:当冷却速率为0.1~0.3℃/s时,15Cr1Mo1V钢细晶区金相组织为铁素体、珠光体和少量贝氏体;当冷却速率上升至0.5℃/s时,组织为较多的贝氏体和较少量的铁素体;当冷却速率为1~5℃/s时,组织主要为粒状贝氏体;当冷却速率达到7℃/s以上时,组织中多为板条贝氏体;当冷却速率为60℃/s时,组织为板条马氏体和少量的贝氏体。随着冷却速率的不断增加,15Cr1Mo1V钢的显微维氏硬度不断上升,在冷却速率为60℃/s时,显微组织中有马氏体存在,其硬度值达到402HV0.2。The 15Cr1Mo1V reheat steam piping material of a power plant operating for about 1.3×10^(5) h was tested by welding thermal simulation tests.By studying the microstructure and hardness of its welded fine grained region,the SH-CCT curve of its repair welding fine grained region was established.The results showed that when the cooling rate was 0.1~0.3℃/s,15Cr1Mo1V steel fine grained region microstructure was mainly ferrite and pearlite and a small amount of bainite,when the cooling rate rised to 0.5℃/s,the microstructure was more bainite and less ferrite,when the cooling rate was 1~5℃/s,the microstructure was the main granular bainite,when the cooling rate reached 7℃/s above,the microstructure was mostly slaty bainite,when the cooling rate was 60℃/s,the microstructure was slaty martensite and a small amount of bainite.With the cooling rate continued increase,micro Vickers hardness of 15Cr1Mo1V steel continued to rise,when the was 60℃/s,there was martensite in the microstructure,its hardness value reached 402HV0.2.

关 键 词：长期服役 15Cr1Mo1V 细晶区 微观组织 硬度 SH-CCT曲线 

分 类 号：TG407[金属学及工艺—焊接]