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Effects of Laser Premelting Treatment on Microstructure and Mechanical Properties of High-Strength Steel Weld Obtained by Laser-MAG Hybrid Welding

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Abstract

Experimental research is performed on ultra-high-strength steel using a 4-kW Nd:YAG laser and a metal active gas (MAG) welding facility providing two processes, namely laser-MAG hybrid welding (LMHW) and laser premelting + laser-MAG hybrid welding (LPLMHW). The study shows that LPLMHW produces joints with a fine lath martensite and excellent mechanical properties. Additionally, there is a certain random crystallographic orientation between the martensite laths by using the LPLMHW process. The microstructure within the martensite laths is refined and many high-angle lath boundaries are formed, which contribute to the enhancement of the impact energy of the joints obtained using the LPLMHW process. This interlaced high-angle grain boundary of martensite laths can significantly improve the tensile strength and toughness of the weld. The impact energy of the welded joints by LPLMHW is higher than that obtained by LMHW. The tensile strength and impact energy of the welded joints by the LPLMHW process reach 1313 MPa and 21.2 J, respectively. The impact energy of the welded joints by LPLMHW is double than that obtained by LMHW.

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Acknowledgments

This study was supported by the Jilin province science and technology development program support project (Nos. 20180201049GX, 20200401135GX) and the Changchun science and technology development program support project (No. 17ss021). We thank Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac) for editing the English text of a draft of this manuscript.

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Li, Y., Liu, S., Zhang, Q. et al. Effects of Laser Premelting Treatment on Microstructure and Mechanical Properties of High-Strength Steel Weld Obtained by Laser-MAG Hybrid Welding. J. of Materi Eng and Perform 29, 5975–5984 (2020). https://doi.org/10.1007/s11665-020-05084-2

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  • DOI: https://doi.org/10.1007/s11665-020-05084-2

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