SS400钢焊接温度场分布规律模拟与验证

Numerical simulation and verification of welding temperature distribution of SS400 steel

应用ANSYS软件对低碳钢SS400单道次焊接过程进行三维有限元模拟,将得到焊接温度场与焊接CCT曲线结合,对热影响区宽度和组织、硬度分布进行预测,通过焊接试验进行验证.结果表明,模拟计算的熔合区宽度为0.7~1.6 mm,过热粗晶区为1.3~2 mm,相变重结晶区和不完全重结晶区各为1 mm左右,热影响区整体宽度为3~4 mm,预测过热粗晶区硬度为180~195 HV,组织为铁素体、贝氏体和珠光体,模拟预测与试验结果较为吻合,因此计算模型和预测方法可靠,可为焊接热影响区组织和性能预报的进一步工作提供依据.

A single pass welding process on low carbon steel SS400 was simulated by 3D finite element method using ANSYS. Combined with the SH-CCT diagram,the width,microstructure and hardness of heat affected zone( HAZ) were predicted by the temperature field attained by numerical simulation.The welding experiment was implemented to validate the simulation results. The calculated results show that the width of fusion zone is 0. 7 ~ 1. 6 mm,and the width of coarse grain zone is 1. 3~ 2 mm,and the width of the complete recrystallization zone and partial recrystallization zone are approximately 1 mm respectively. Hence the whole width of HAZ is about 3 ~ 4 mm. The prediction of the hardness on coarse grain zone is 180 ~ 195 HV.The prediction on microstructure is composed of ferrite,bainite and pearlite. All the prediction results are in good agreement with verification experiments. Consequently,the calculated model and prediction method are reliable for the prediction of HAZ microstructure and its property.