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19-02-2019 | Issue 3/2019

Journal of Materials Engineering and Performance 3/2019

Effect of Martensite Content on Failure Behavior of Laser Welded Dual-Phase Steel Joints During Deformation

Journal:
Journal of Materials Engineering and Performance > Issue 3/2019
Authors:
Peng-Cheng Huan, Xiao-Nan Wang, Lei Yang, Zhi Zheng, Zeng-Rong Hu, Min Zhang, Chang-Jun Chen
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Abstract

Laser welding was applied to three types of dual-phase (DP) steel sheets (DP590, DP780, and DP980) with different martensite contents. The microstructure of laser welded joints was observed by optical microscope and scanning electron microscope, and the hardness of welded joints was measured by a microhardness tester. The tensile testing machine and the Erichsen test machine were employed to measure the tensile properties and forming properties of welded joints, respectively. The microstructure model showed that the welded joints of three different materials all contained a hardened zone (HZ) that was composed of a fusion zone, a coarse-grained heat-affected zone, and fine-grained heat-affected zone. The microstructure of the HZ contained mainly martensite such that the average martensite content of welded joints was increased by 1.9-9.8%, and the microhardness of the HZ was 1.2-1.9 times that of the base metal (BM). Moreover, the elongation of welded joints decreased with decreasing martensite content in the BM, and the effect was severe for the DP590 welded joint (21.8%) compared to the other two welded joints. During the Erichsen test, deformation failure varied among the welded joints with different martensite contents, and it was determined by the HZ and softened zone. The fracture occurred in the softened zone and ran parallel along the zone for DP980 welded joints, whereas the fracture occurred in the HZ and ran perpendicular to this zone for the other two welded joints. The Erichsen values of the DP590, DP780, and DP980 welded joints were 81.1, 91.7, and 85.0% of the BM, respectively.

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