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The objective of this study is to enhance the understanding of the mechanisms responsible for the reduced creep life in the presence of hydrogen, with the goal of ensuring the safety of advanced high-...temperature hydrogen technologies. The material used in this study was pure iron, which, due to its simple chemical composition and single-phase microstructure, is a model system for examining the role of hydrogen in accelerated creep deformation. Creep tests were conducted in hydrogen and argon gases at 873 K, with an absolute gas pressure of 0.12 MPa for both gases. The results showed that the creep strain rate in hydrogen gas was significantly accelerated, leading to a substantial reduction in creep life. The fracture surfaces and profiles exhibited dimple and double cup features, which were remarkably similar regardless of the test environment and applied stress. Analysis of the secondary creep deformation indicated that the role of hydrogen was to reduce the creep activation energy. One possible mechanism for hydrogen's acceleration of creep deformation is enhanced dislocation climb, mediated by an increased vacancy density resulting from a reduction in vacancy formation energy due to hydrogen. In addition, it was found that decarburization during creep testing has a significant effect on reducing creep life. Importantly, the creep strain rate of pre-decarburized specimens was found to be higher in hydrogen than in argon, indicating the presence of a unique hydrogen effect that accelerates creep deformation.続きを見る
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Mendeley出力
7450737_advpub