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Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints

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Abstract

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.

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Notes

  1. Bead-on-plate means a butt weld with full penetration on the blanks of uniform thickness.

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Acknowledgments

The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC), and Initiative for Automotive Innovation (Ontario Research Fund—Research Excellence) for providing financial support. N. F. thanks Ryerson School of Graduate Studies (SGS) for his SGS scholarship. D. L. C. is also grateful for the financial support by the Premier’s Research Excellence Award (PREA), Canada Foundation for Innovation (CFI), and Ryerson Research Chair (RRC) program. The authors would also like to thank J. Li (University of Waterloo) for providing the welded joints. and Messrs. A. Machin, Q. Li, J. Amankrah, D. Ostrom, and R. Churaman (Ryerson University) for their assistance in the experiments.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada

    N. Farabi & D. L. Chen

  2. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada

    Y. Zhou

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Correspondence to D. L. Chen.

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Farabi, N., Chen, D.L. & Zhou, Y. Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints. J. of Materi Eng and Perform 21, 222–230 (2012). https://doi.org/10.1007/s11665-011-9865-8

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