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为了研究高强钢激光焊接线能量对HAZ奥氏体晶粒长大的影响,运用ANSYS有限元软件模拟了激光焊接时的三维瞬态温度场,结合热循环曲线和HAZ奥氏体晶粒长大的特征,确定了高强钢激光焊接HAZ奥氏体晶粒长大的动力学方程参数,并分析了不同线能量对HAZ奥氏体晶粒长大的影响,其理论计算结果与试验结果相吻合。结果表明,激光焊接高强钢时,HAZ奥氏体晶粒长大现象明显。激光焊接线能量对HAZ奥氏体晶粒长大有直接影响,在一定范围内,随着焊接线能量的增加,HAZ奥氏体晶粒长大越显著,主要是随着焊接线能量加大,焊接热输入量增加,HAZ峰值温度及晶粒粗化温度区间持续时间长的作用。
In order to study the influence of high-strength steel laser welding line energy on the austenite grain growth of HAZ, the three-dimensional transient temperature field during laser welding was simulated by ANSYS finite element software. Combined with the thermal cycle curve and HAZ austenite grain growth The kinetic parameters of HAZ austenite grain growth were determined and the influence of different line energy on the austenite grain growth of HAZ was analyzed. The theoretical calculation results are in good agreement with the experimental results . The results show that HAZ austenite grain growth is obvious when laser welding high strength steel. The energy of laser welding wire has a direct impact on the austenite grain growth of HAZ. Within a certain range, with the increase of welding wire energy, HAZ austenite grains grow more significantly, mainly with the increase of welding wire energy, Welding heat input increased, HAZ peak temperature and grain coarsening temperature range duration of the role.