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研究了外加纵向磁场对SUS316L奥氏体不锈钢激光-稀有气体保护复合焊接接头成形特点、微观组织及显微硬度分布的影响。实验结果表明,在外加纵向磁场的作用下,接头的余高减小,熔宽增大,成形系数增大,截面宽而深。外加磁场改变了接头的热循环,使热影响区析出长条形δ-铁素体,抑制了晶粒的生长。外加磁场使熔池旋转,接头晶粒得到细化,结晶均匀性得到提高,显微硬度分布变得稳定。这种影响随着磁感应强度的增加而增强,随着接头深度的增大而减弱。
The effect of applied longitudinal magnetic field on the forming characteristics, microstructure and microhardness of SUS316L austenitic stainless steel laser-rare gas protection composite welding joint was studied. The experimental results show that under the action of applied longitudinal magnetic field, the residual height of the joint decreases, the melting width increases, the forming coefficient increases, and the cross section is wide and deep. The applied magnetic field changes the thermal cycle of the joint, resulting in the precipitation of the elongated δ-ferrite in the heat-affected zone and inhibiting the growth of the grains. The applied magnetic field causes the molten pool to rotate, the joint grains are refined, the crystal uniformity is improved, and the microhardness distribution becomes stable. This effect increases with increasing magnetic induction and decreases with increasing joint depth.