连铸中间包焊接残余应力数值模拟

使用有限元法模拟了中间包焊接残余应力分布,结果表明,中间包焊接后在焊缝位置形成了较大的残余应力,残余应力峰值约672 MPa,已经达到材料屈服极限;在中间包吊耳和背部应力集中较为明显,说明在这些位置焊接裂纹倾向较大;在中间包背部,焊接残余应力关于中间包中面近似成对称分布,在中部和两侧焊缝残余应力最高,等效应力可达约40...

Numerical Simulation of Welding Residual Stresses in Continuous Casting Tundishes

The welding residual stress of continuous casting tundishes was simulated by the finite element method. The simulation results show that a larger residual stresses is generated on the welding seam after welding continuous casting tundishes, with the peak stress up to about 672 MPa, which has reached the yield limit of the material. It is obvious that stress concentration is formed in the lifting lugs and backside of the tundishe, which indicates strong tendency of cracking in those locations. It is found the welding residual stresses are symmetrically distributed on the backside of the tundishe, with higher stresses on the center and both flanks of weld, and the equivalent stress can reach to about 400 MPa. The residual stress in the rest part of welds is lower, with equivalent value about 300 MPa. Significant stress concentration is generated in the welds between lifting lugs and the body of tundish, with the maximum equivalent stress up to about 450 MPa.