X70管线钢在役焊接损伤演化模型与数值模拟  

Damage evolution model and numerical simulation of X70 pipeline steel of in-service welding

作　　者：谷世伟 徐良 杨海锋 张洪杰 韩涛 GU Shiwei;XU Liang;YANG Haifeng;ZHANG Hongjie;HAN Tao(HWINICHST Welding&Engineering Innovation Center(Qingdao)Co.,LTD,Qingdao,266111;College of Mechanical and Electrical Engineering,China University of Petroleum(East China),Qingdao,266580)

机构地区：[1]哈焊国创(青岛)焊接工程创新中心有限公司,青岛266111 [2]中国石油大学(华东)材料科学与工程学院,青岛266580

出　　处：《焊接学报》2022年第10期86-92,100,I0008,共9页Transactions of The China Welding Institution

摘　　要：以X70管线钢为研究对象,进行了不同温度和应变速率下的高温拉伸试验,获得了初始损伤阈值应变、临界损伤断裂应变、临界损伤值等损伤模型参数,建立了基于BONARO模型的损伤演化方程;模拟在役焊接损伤演化过程,并与在役焊接试验结果对比,研究介质压力、壁厚对在役焊接损伤演化行为的影响规律,研究发现在役焊接过程中,熔池下方内壁处最大熔深处后方1~2 mm区域为失效高风险区,损伤值在壁厚方向上由熔合线向内壁递减,管内介质压力的减小、壁厚的增大都会在一定程度上减小在役焊接过程中熔池下方的损伤值,从而减小烧穿失效的风险.In this paper,X70 pipeline steel was taken as the research object.High temperature tensile tests were carried out at different temperatures and strain rates.Damage model parameters such as the threshold strain,critical damage strain and critical damage were obtained,and damage evolution equations based on BONARO model was established.The damage evolution process of in-service welding was simulated and compared with the experimental results of in-service welding.The influence rules of medium pressure and wall thickness on the damage evolution behavior of in-service welding were studied.It was found that:during the in-service welding process,molten pool below the maximum damage value of the inner wall is located in the largest fusion deep behind the 1 mm to 2 mm area,damage value in thickness direction decreases from the fusion line to the inner wall;decreasing inner medium pressure and increasing the wall thickness can reduce the damage at the bottom of molten pool,thus reduce the risk of burn through.

关 键 词：在役焊接 烧穿失效 损伤 

分 类 号：TG404[金属学及工艺—焊接]