Hydrogen embrittlement behavior of oilfield-grade Inconel 718 alloy laser welded joint

doi:10.13251/j.issn.0254-6051.2020.08.011

Abstract

Abstract: The oilfield-grade Inconel 718 alloy, which was respectively heat treated by 1030 ℃×2 h solution treatment+780 ℃×8 h aging and 1030 ℃×2 h solution treatment+780 ℃×16 h aging, was welded by laser beam welding process. The hydrogen embrittlement behaviors of the base metal and welded joint of the alloy were studied during in situ hydrogen charging by analyses of microstructure, tensile properties and fracture morphologies. The results show that longer time aging induces large amount of δ phase, resulting in the hydrogen embrittlement susceptibility index of the base metal increasing from 0.27 to 0.48. The hydrogen embrittlement susceptibility of the welded joint is not affected by the heat treatment before welding, which is 0.39 and 0.38, respectively. However, the precipitation of Laves phase in welded zone induces that the hydrogen embrittlement susceptibility of the welded joints is higher than that of base metal aged for 8 h.

Key words: laser welding, Inconel 718 alloy, aging, hydrogen embrittlement

CLC Number:

TG142.1

Zeng Qiang, Wu Ying, Xiao Huijin, Zhu Shaowei. Hydrogen embrittlement behavior of oilfield-grade Inconel 718 alloy laser welded joint[J]. Heat Treatment of Metals, 2020, 45(8): 50-55.

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