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首页> 外文期刊>Journal of Materials Engineering and Performance >Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints
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Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints

机译：激光焊接双相钢接头的拉伸性能和加工硬化行为

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摘要

The aim of this investigation was to evaluate the microstructural change after laser welding and its effect on the tensile properties and strain hardening behavior of DP600 and DP980 dual-phase steels. Laser welding led to the formation of martensite and significant hardness rise in the fusion zone because of the fast cooling, but the presence of a soft zone in the heat-affected zone was caused by partial vanishing and tempering of the pre-existing martensite. The extent of softening was much larger in the DP980-welded joints than in the DP600-welded joints. Despite the reduction in ductility, the ultimate tensile strength (UTS) remained almost unchanged, and the yield strength (YS) indeed increased stemming from the appearance of yield point phenomena after welding in the DP600 steel. The DP980-welded joints showed lower YS and UTS than the base metal owing to the appearance of severe soft zone. The YS, UTS, and strain hardening exponent increased slightly with increasing strain rate. While the base metals had multi-stage strain hardening, the welded joints showed only stage III hardening. All the welded joints failed in the soft zone, and the fracture surfaces exhibited characteristic dimple fracture.
机译：这项研究的目的是评估激光焊接后的显微组织变化及其对DP600和DP980双相钢的拉伸性能和应变硬化行为的影响。由于快速冷却，激光焊接导致了马氏体的形成，并在熔合区显着提高了硬度，但热影响区中存在软区是由于预先存在的马氏体的部分消失和回火所致。 DP980焊接接头的软化程度远大于DP600焊接接头的软化程度。尽管延展性降低，但极限抗拉强度（UTS）几乎保持不变，而屈服强度（YS）确实由于DP600钢焊接后出现屈服点现象而增加。由于出现严重的软区，DP980焊接接头的YS和UTS低于母材。 YS，UTS和应变硬化指数随应变率的增加而略有增加。尽管贱金属具有多阶段应变硬化，但焊接接头仅显示III期硬化。所有的焊接接头都在软区破裂，并且断裂表面表现出特征性的凹痕断裂。

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