SU Zaichun, ZHANG Jiahui, ZHANG Pei, et al.Effect of Solution Treatment on Properties of 254SMo Steel Welded Joint[J].Electric Welding Machine, 2022, 52(3): 78-83.
SU Zaichun, ZHANG Jiahui, ZHANG Pei, et al.Effect of Solution Treatment on Properties of 254SMo Steel Welded Joint[J].Electric Welding Machine, 2022, 52(3): 78-83. DOI: 10.7512/j.issn.1001-2303.2022.03.11.
Effect of Solution Treatment on Properties of 254SMo Steel Welded Joint
Austenitic stainless steel 254SMo is widely used in chemical industry and other industries because of its good resistance to pitting corrosion and intergranular corrosion. In this paper, in view of the reduced mechanical properties and corrosion resistance of austenitic stainless steel 254SMo welded joints, it is proposed to use 1 150 ℃ solution treatment method improves the properties of welded joints. The super austenitic stainless steel 254SMo was welded by GTAW welding, and the mechanical properties, impact toughness and corrosion resistance of the welded joints in the as-welded and solution-treated states were compared through experiments. The experimental results show that: after solution treatment at 1 150 ℃, the coarse columnar crystal structure in the weld zone disappears, and the equiaxed crystal structure in the heat affected zone appears larger twin crystal structure; the hardness of the weld seam, the heat affected zone and the base metal after solution treatment The value is significantly reduced, the average hardness of the heat affected zone is reduced by 12%, and the average hardness of the weld is reduced by 24%. The tensile strength of the welded joints decreased slightly, while the impact toughness at -196 ℃ increased significantly. The weld increased from 132 J to 161 J, and the heat-affected zone increased from 102 J to 164 J; solution treatment eliminated the grain boundaries of the heat-affected zone. The precipitation phase relieves the intergranular Cr depletion, thereby significantly improving the corrosion resistance of the welded joint.
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