管道初始状态对P92钢细晶区组织和性能的影响研究  

Effect of Original State of Pipe on Microstructure and Mechanical Properties of FGHAZ of P92 Steel

作　　者：李勇 王家庆 刘俊健 杜成超 赵晓华 LI Yong;WANG Jianqing;LIU Junjian;DU Chengchao;ZHAO Xiaohua(Datang Boiler Pressure Vessel Inspection Center Co.,Ltd.,Hefei 230088,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;East China Electric Power Test and Research Institute,China Datang Corporation Science and Technology Research Institute Co.,Ltd.,Hefei 230088,China)

机构地区：[1]大唐锅炉压力容器检验中心有限公司,安徽合肥230088 [2]江苏大学材料科学与工程学院,江苏镇江212013 [3]中国大唐集团科学技术研究总院有限公司华东电力试验研究院,安徽合肥230088

出　　处：《热加工工艺》2024年第13期75-78,84,共5页Hot Working Technology

基　　金：江苏省自然科学基金资助项目(BK20210756);江苏省博士后科研资助计划项目(2021K035A)。

摘　　要：本研究以新旧P92钢管为研究对象,基于快速热处理方法制备了细晶热影响区棒状试样,通过扫描电镜、透射电镜观察,显微硬度、蠕变实验对比了两种细晶区的显微组织和力学性能,揭示了管道初始状态对P92钢细晶区组织和性能的影响。结果表明:与P92新管细晶区相比,P92旧管细晶区的位错密度低,析出相粗大,降低了其硬度和蠕变抗力。蠕变过程中,P92旧管细晶区的Laves相析出倾向更大,促进蠕变空洞的形成,加速蠕变断裂,缩短了其蠕变寿命。Taking the new and old P92 pipes as the object,the rod samples of fine grain heat affected zone(FGHAZ)was prepared by using rapid heat treatment process.The microstructure and properties of the two FGHAZ samples were compared through observation by SEM,TEM,microhardness and creep tests,and the effect of the pipe original state on the microstructure and mechanical properties of FGHAZ of P92 steel was revealed.The results show that compared with that of the FGHAZ of new P92 pipe,the dislocation density of the FGHAZ of old P92 pipe is lower,the size of the precipitates is bigger,which decreases the hardness and creep resistance.During creep test,the FGHAZ of the old P92 pipe has higher precipitating tendency of Laves phase,which promotes the formation of creep void,accelerates the creep fracture and shortens the creep rupture life.

关 键 词：P92耐热钢 LAVES相 硬度 蠕变 断裂 

分 类 号：TG407[金属学及工艺—焊接]