SMA490BW耐候钢焊接与焊后热处理残余应力的数值模拟  

Numerical Simulation Analysis of Residual Stress in SMA490BW Welding and Post-Weld Heat Treatment

作　　者：户迎灿 王秋影 邱培现 许骏 廖子文 HU Yingcan;WANG Qiuying;QIU Peixian;XU Jun;LIAO Ziwen(CRRC Qingdao Sifang Locomotive and Rolling Stock Co.,Ltd.,Qingdao 266311,China;Institute of welding,School of materials science and engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,山东青岛266311 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《电焊机》2024年第2期77-82,共6页Electric Welding Machine

摘　　要：SMA490BW耐候钢焊接过程中会产生较大的残余应力,常使用去应力退火的热处理方式消除残余应力。建立了SMA490BW耐候钢的焊接过程和焊后热处理过程中的有限元模型,对焊接以及焊后热处理的残余应力场进行了有限元模拟和验证。通过引入材料的CREEP本构模型,利用Norton-Bailey指数方程模拟计算了焊后热处理时材料的蠕变行为,得到热处理对的焊接残余应力的影响。研究结果表明:使用CREEP本构模型,引入材料的蠕变行为可以较好地模拟焊接工件的焊后热处理过程中的应力应变变化,计算得到的残余应力值与实测值有较好的一致性。这为工业上优化SMA490BW耐候钢的焊接工艺、降低残余应力提供了理论支持。SMA490BW weathering steel is usually joined by welding.Residual stress will be generated during the welding process,which has a great impact on engineering application.In industry,annealing heat treatment is often used to reduce residual stress.This paper establishes a finite element model of the welding process and post-weld heat treatment process of SMA490BW,the finite element simulation of the residual stress field of welding and post-weld heat treatment were carried out,and it was proven correct through test.By introducing the CREEP constitutive model of the material,the Norton-Bailey exponential equation is used to simulate the creep behavior of the material during post-weld heat treatment,and the effect of heat treatment on the welding residual stress is obtained.The research results show that:using the CREEP constitutive model,introducing the creep behavior of material can better simulate the stress and strain changes during the post-weld heat treatment of the welded workpiece,and the simulated residual stress values are in good agreement with the measured values.

关 键 词：SMA490BW耐候钢 热处理 残余应力 数值模拟 

分 类 号：TG441.8[金属学及工艺—焊接]