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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure and mechanical properties of laser welded dissimilar DP600/DP980 dual-phase steel joints
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Microstructure and mechanical properties of laser welded dissimilar DP600/DP980 dual-phase steel joints

机译：激光焊接异种DP600 / DP980双相钢接头的组织和力学性能

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摘要

The use of dual phase (DP) steels in the automobile industry unavoidably involves welding and dynamic loading. The aim of this investigation was to evaluate the microstructural change and mechanical properties of laser welded dissimilar DP600/DP980 steel joints. The dissimilar joints showed a significant microstructural change from nearly full martensite in the fusion zone (FZ) to the unchanged ferrite-martensite dual-phase microstructure in the base metal. The welding resulted in a significant hardness increase in the FZ but the formation of a soft zone in the heat-affected zone (HAZ). The dissimilar welded joints were observed to exhibit a distinctive unsymmetrical hardness profile, yield-point-like phenomenon, and single-stage work hardening characteristic, with yield strength and work hardening rate lying in-between those of DP600 and DP980 base metals, and ultimate tensile strength equivalent to that of DP600 base metal. Although the welded joints showed a lower fatigue limit than the base metals, the fatigue life of the welded joints at higher stress amplitudes was almost the same as that of the DP6O0 base metal. The welded joints failed in the soft zone at the DP600 side under tensile loading and fatigue loading at the higher stress amplitudes. Fatigue crack initiation occurred from the specimen surface and crack propagation was characterized by typical fatigue striation together with secondary cracks.
机译：在汽车工业中使用双相（DP）钢不可避免地涉及焊接和动态载荷。这项研究的目的是评估激光焊接异种DP600 / DP980钢接头的显微组织变化和力学性能。不同的接头显示出显着的显微组织变化，从熔合区（FZ）的几乎全马氏体转变为母材中未改变的铁素体-马氏体双相显微组织。焊接导致FZ的硬度显着增加，但在热影响区（HAZ）中形成了软区。观察到不同的焊接接头表现出独特的不对称硬度分布，类屈服点现象和单阶段加工硬化特性，屈服强度和加工硬化率介于DP600和DP980母材之间，并且最终抗拉强度等同于DP600母材。尽管焊接接头的疲劳极限比母材低，但在较高应力振幅下的焊接接头疲劳寿命几乎与DP6O0母材相同。在较高应力振幅下，在拉伸载荷和疲劳载荷下，DP600侧软区的焊接接头失效。疲劳裂纹萌生于试样表面，裂纹扩展的特征是典型的疲劳条纹和二次裂纹。

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