经历多次热循环的X80管线钢焊接粗晶区的组织性能研究  

Microstructure and Property of Coarse-Grained Heat Affected Zone in X80 Pipeline Steel Under Multiple Thermal Cycles

作　　者：王刚[1] 尹立孟[1] 唐丽[1] 王学军 刘锴 郑明高 王京 冯大永 WANG Gang;YIN Limeng;TANG Li;WANG Xuejun;LIU Kai;ZHENG Minggao;WANG Jing;FENG Dayong(School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;National Pipe Network Group Southwest Pipeline Co.Ltd.,Chengdu 402660,China;Sinopec Jianghan Oil Construction Engineering Co.Ltd.,Qianjiang Hubei 433100,China;PetroChina(Xinjiang)Petroleum Engineering Co.Ltd.,Karamay Xinjiang 834000,China;Liaohe Oilfield Construction Co.Ltd.,Panjin Liaoning 124010,China)

机构地区：[1]重庆科技学院冶金与材料工程学院,重庆401331 [2]国家管网集团西南管道有限责任公司,成都402660 [3]中石化江汉油建工程有限公司,湖北潜江433100 [4]中油(新疆)石油工程有限公司,新疆克拉玛依834000 [5]辽河油田建设有限公司,辽宁盘锦124010

出　　处：《重庆科技学院学报（自然科学版）》2023年第1期57-61,104,共6页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家自然科学基金面上项目“基于多次热循环的高级别管线钢焊接粗晶区的组织演变规律及增韧机理”(51674056);重庆市自然科学基金面上项目“基于焊后轧制的高级别管线钢焊接接头组织演化及增韧机理”(cstc2020jcyj-msxmX0552)。

摘　　要：采用相变仪DIL805A D模拟X80管线钢焊接的多次热循环过程,并采用OM、SEM及HV-1000获得其显微组织、M-A组元尺寸和体积分数以及原奥氏体晶粒粗化情况和显微硬度。结果表明:经历峰值温度为1350℃的快速焊接热循环作用后,母材中的PF和QF消失;随着热循环次数的增加,组织类型基本保持不变,主要为GB、BF、M-A组元,但GB体积分数逐渐减少、BF体积分数逐渐增多、BF板条宽度从1次热循环后的0.77μm增至3次热循环后的1.36μm,M-A组元的平均晶粒尺寸增大且体积分数略微减少;原奥氏体晶粒尺寸从1次热循环后的40.5μm粗化至3次热循环后的69.5μm,且表现出逐渐不均匀化。此外,X80管线钢显微硬度的上升趋势随热循环次数的增加而减缓。The multiple thermal cycle process of X80 pipeline steel welding is simulated by phase transformation instrument DIL805A D,and its microstructure,M-A component size and volume fraction,original austenite grain coarsening and microhardness are obtained by OM,SEM and HV-1000.The results show that PF and QF in base metal disappear after rapid welding thermal cycle with peak temperature of 1350℃.With the increasing of the number of thermal cycles,the structure type basically remains unchanged,mainly GB,BF,M-A components,but the content of GB gradually decreases,the number of BF gradually increases,and the lath width of BF coarsen from 0.77μm(after 1 cycle)to 1.36μm(after 3 cycles).The average grain size of M-A component increases and the volume fraction decreases slightly.The original austenite grain size increases from 40.5μm(after 1 cycle)to 69.5μm(after 3 cycles),showing a worse inhomogeneous appearance.In addition,the hardness of X80 pipeline steel shows an increasing trend with the number of thermal cycle increasing,and the trend is slowing down.

关 键 词：X80管线钢 多次热循环 粗晶区(CGHAZ) 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]