Advanced high-strength steel (AHSS) is a class of promising materials for safe and lightweight structural applications in the transportation industry due to its high energy absorption capacity during severe plastic deformation. However, some types of AHSS tend to become brittle after welding and fail during forming operations. This paper proposes a novel method of laser welding AHSS class of 22MnB5 steel by induction-heating the samples in the bainitic range, which was identified via a theoretical analysis using finite element and physical metallurgy modeling. The calculated annealing temperature was 485 °C, and the subsequent laser parameters were set at a power of 800 W and a welding speed of 2 m/min. The welds performed on such pre-heated samples showed a bainitic microstructure consisting of bainitic ferrite along with uniformly distributed ultrafine carbide precipitates, in contrast to an almost fully martensitic microstructure conducted at room temperature. The average value of microhardness in the heat-affected zone thus decreased from ~ 670 HV without pre-heating to ~ 280 HV with pre-heating. The laser welds with pre-heating exhibited not only a slightly higher yield strength and elongation, despite a slightly lower ultimate tensile strength, but also a superior drawability with an Erichsen index increase by 28% compared with the welds without pre-heating.

先进的高强度钢（AHSS）由于在严重的塑性变形过程中具有很高的能量吸收能力，因此在运输行业中用于安全轻质结构应用是一类有前途的材料。但是，某些类型的AHSS在焊接后往往会变脆，在成型操作中会失效。本文提出了一种通过在贝氏体范围内感应加热样品来激光焊接AHSS级22MnB5钢的新方法，该方法是通过有限元理论分析和物理冶金建模确定的。计算出的退火温度为485°C，随后的激光参数设置为800 W的功率和2 m / min的焊接速度。与在室温下进行的几乎完全马氏体组织相反，在这种预热的样品上进行的焊接显示出由贝氏体铁素体以及均匀分布的超细碳化物沉淀组成的贝氏体组织。因此，热影响区的显微硬度平均值从未预热的〜670 HV降低到预热的〜280 HV。经过预热的激光焊缝，尽管极限抗拉强度稍低，但不仅显示出稍高的屈服强度和伸长率，而且与未进行预热的焊缝相比，其优越的可拉伸性和埃里克森指数提高了28％。因此，热影响区的显微硬度平均值从未预热的〜670 HV降低到预热的〜280 HV。经过预热的激光焊缝，尽管极限抗拉强度稍低，但不仅显示出稍高的屈服强度和伸长率，而且与未进行预热的焊缝相比，其优越的可拉伸性和埃里克森指数提高了28％。因此，热影响区的显微硬度平均值从未预热的〜670 HV降低到预热的〜280 HV。经过预热的激光焊缝，尽管极限抗拉强度稍低，但不仅显示出稍高的屈服强度和伸长率，而且与未进行预热的焊缝相比，其优越的可拉伸性和埃里克森指数提高了28％。