摘要
采用钻孔应变法测试了不同焊后热处理状态下L360管道环焊接头的残余应力,并对各状态下环焊接头进行了拉伸试验、硬度测试试验及微观组织分析。结果表明:550~670℃范围内的热处理可以显著改善环焊接头的残余应力,当热处理温度为610℃时,轴向及环向应力明显下降,环向残余拉应力相比焊态降低74.5%;热处理后L360环焊接头显微硬度相比焊态虽略有下降,但硬度分布更加均匀,且热影响区的软化问题得到改善;热处理会使得L360环焊接头抗拉强度有小幅下降,但不会影响原有接头的强度匹配关系。
The residual stress of the girth welded joints of L360 pipeline under different post-weld heat treatment conditions was measured by hole drilling strain-gauge method,and the tensile test,hardness test and microstructure analysis were carried out for the girth welded joints under different conditions.The results show that the residual stress of the girth welded joint can be significantly improved by heat treatment in 550-670℃.The axial and circumferential stresses decrease significantly,and the circumferential residual tensile stress decreases by 74.5%compared with that of the welded joint.After heat treatment,the hardness of L360 girth welded joint decreases slightly,but the hardness distribution is more uniform and the softening problem of heat affected zone is improved.The heat treatment can reduce the tensile strength of L360 girth welded joint slightly,but it will not affect the original strength match relationship.
作者
魏可嘉
宋卫臣
邢金涛
程俊
宏岩
宋之皓
王鹏
牛靖
WEI Kejia;SONG Weichen;XING Jintao;CHENG Jun;HONG Yan;SONG Zhihao;WANG Peng;NIU Jing(State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China;SINOPEC Petroleum Engineering Design Company,Dongying 257000,China;Technical Monitoring Center of PetroChina Changqing Oilfield Company,Xi'an 710018,China;CNPC Tubular Goods Research Institute,Xi'an 710077,China)
出处
《热加工工艺》
北大核心
2026年第2期46-50,58,共6页
Hot Working Technology
基金
国家重点研发计划专项项目(2023YFB3408200)。
关键词
L360管线钢
钻孔应变法
残余应力
焊后热处理
L360 pipeline steel
hole drilling strain-gauge method
residual stress
post-weld heat treatment
