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Influence of Laser Power on Microstructure and Mechanical Properties of Laser Welded Medium Manganese Transformation-Induced Plasticity Steel

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Abstract

In this study, laser welding was employed to butt-weld warm-rolled 6.86% medium Mn transformation-induced plasticity (TRIP) steel (MMS). The investigation focused on the microstructure and mechanical properties of the base metal (BM) as well as the welded joint (WJ). The BM exhibited a mixed microstructure consisting of austenite and δ-ferrite, while the fusion zone (FZ) contained martensite and δ-ferrite. In terms of hardness, the cross section of the FZ in the WJ displayed higher values compared to the BM. The heat-affected zone (HAZ) did not exhibit significant hardness reduction. Tensile testing revealed that the WJ of the MMS exhibited ductile fracture behavior, with the elongation initially increasing and then decreasing with the rise in laser power. Notably, experimental data demonstrated that a laser power of 1500 W outperformed all other power settings in terms of macro morphology and performance.

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Data Availability

All data in this study are available from the corresponding author by request.

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Acknowledgments

The authors thank you for the project support from Ministry of Science and Technology of China (No. 52204382 and 52274381), Jiangsu Province (No. BK20200985 and No. BK20220629), Postdoctoral Administration Office in China (No.2021M701717) and Changzhou (No. CQ20210102).

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Authors and Affiliations

  1. School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou, 213164, China

    Wangwang Yu, Haijun Pan, Bin Zhang, Bo Huang, **nyu Li, Yujie Zhao, **g Li, Min Ji, Ze Sun, Zhen Zhang & Lin Liu

  2. Jiangsu Key Laboratory of Green Process Equipment, Changzhou, 213164, China

    Wangwang Yu, Haijun Pan, Bin Zhang, Bo Huang & Lin Liu

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  1. Wangwang Yu
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Contributions

HP provide conceptualization, methodology, investigation, writing–review & editing, formal analysis, funding acquisition, and supervision. WY gave resources, data curation, and writing–original draft. BZ did visualization, writing–review & editing, and supervision. BH done visualization, writing–review & editing, and supervision. XL contributed visualization, writing–review & editing, and supervision. YZ performed visualization, writing–review & editing, and supervision. JL provides writing–review & editing and supervision. MJ did writing–review & editing and supervision. ZS done writing–review & editing and supervision. ZZ contributed writing–review & editing and supervision. LL performed writing–review & editing and supervision.

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Correspondence to Haijun Pan or Lin Liu.

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Yu, W., Pan, H., Zhang, B. et al. Influence of Laser Power on Microstructure and Mechanical Properties of Laser Welded Medium Manganese Transformation-Induced Plasticity Steel. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08508-x

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