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Effects of Heat Treatment on Microstructure, Mechanical Properties, and Residual Stress of Oscillation Laser–Tungsten Inert Gas Hybrid Welded Joints for SA-738Gr.B Steel

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Abstract

This paper adopted the new process of double-sided oscillation laser autogenous backing welding and double-sided oscillation laser–TIG hybrid filling welding to achieve 80 mm thick SA-738Gr.B steel narrow gap welding in the horizontal position. The microstructure, mechanical properties, and residual stress of the welded joints in the as-welded (AW) state and in the post-weld heat treatment (PWHT) state were analyzed comparatively. The results show that because of the high-temperature tempering effect of PWHT, the microstructure of the welded joint is transformed into a high-temperature tempered microstructure with the increase in alloy carbide precipitation. The grains growth of the backing weld and the base material is obvious. The relative frequency of the high-angle grain boundary of the weld increases. Under the PWHT, the tensile strength of the welded joint decreases, and the residual stresses of the welded joint are redistributed and reduced significantly.

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Acknowledgments

Thanks to the Liao Ning Revitalization Talents Program (No. XLYC190203), National Key R and D Program of China (No.2018YFB1107900), National Natural Science Foundation of China (Nos. U1933129 and U21B2079), Key Program of the Natural Science Foundation of Tianjin (No.19JCZDJC39000 and 22YFFCYS00090), and the Open Research Fund of State Key Laboratory of High-Performance Complex Manufacturing, Central South University (Kfkt2021-13).

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  1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Manpeng Wu, Zhen Luo & Sansan Ao

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  1. Manpeng Wu
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Wu, M., Luo, Z. & Ao, S. Effects of Heat Treatment on Microstructure, Mechanical Properties, and Residual Stress of Oscillation Laser–Tungsten Inert Gas Hybrid Welded Joints for SA-738Gr.B Steel. J. of Materi Eng and Perform 33, 2694–2710 (2024). https://doi.org/10.1007/s11665-023-08202-y

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