焊后热处理对150 mm厚容器钢板残余应力影响的数值模拟  

Numerical simulation on influence of post-weld heat treatment on residual stress in 150 mm thick vessel steel plate

作　　者：石红昌 黄安明 刘兴 强斌[2] Shi Hongchang;Huang Anming;Liu Xing;Qiang Bin(Deyang Tengen Heavy Industry Co.,Ltd.,Deyang Sichuan 618000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]德阳天元重工股份有限公司,四川德阳618000 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《金属热处理》2024年第5期62-67,共6页Heat Treatment of Metals

基　　金：四川省自然科学基金(2022NSFSC1017);四川省科技计划(2021YJ0052)。

摘　　要：焊后热处理可以有效消减钢结构焊接接头中的残余应力。以150 mm厚容器钢平板对接焊接头为研究对象,基于有限元方法对焊接接头热处理前、后的残余应力场进行了仿真模拟,系统分析了焊后热处理过程中残余应力的演化规律,并对相关焊后热处理工艺参数下残余应力消除效果进行了对比分析。结果表明:焊后热处理可以显著减小纵、横向焊接残余应力峰值,但对残余应力的分布形式影响较小;热处理过程中焊接残余应力释放主要发生在升温阶段,而在保温阶段和冷却阶段,释放量较小甚至有所回弹。通过工艺参数分析可知,残余应力释放量随着保温时间和热处理温度的改变呈非线性演化,因此,在实际焊后热处理时需综合考虑影响因素的组合效应,以优化残余应力消除效果和成本。Post-weld heat treatment(PWHT)can effectively reduce residual stress in welded joint.The residual stress field before and after PWHT for 150 mm thick vessel steel butt-welded joint was simulated by using finite element analysis.The evolution of residual stress during PWHT was systematically analyzed,and a comparative analysis was conducted on the residual stress relief effect of relevant PWHT process parameters.The results indicate that the PWHT significantly reduces the peak values of longitudinal and transverse residual stresses,but the impact on the distribution pattern of residual stress is relatively small.Stress relief primarily occurs during the heating stage of the treatment,with minimal relief or even rebound during the soaking and cooling stages.The analysis of process parameters reveals a nonlinear evolution of stress relief with changes in soaking time and heating temperature.Therefore,practical PWHT should consider the combined effects of influencing factors to optimize stress relief effectiveness and cost.

关 键 词：焊后热处理 焊接残余应力 蠕变 数值模拟 

分 类 号：TG441.8[金属学及工艺—焊接]