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説明:

This study investigated the effect of cyclic heat treatment on the resistance of tempered martensitic steels to hydrogen embrittlement. The cyclic heat treatment not only refined the prior austenite grain sizes from approximately 30 to 5 μm but also reduced the initial dislocation density. The change in microstructure by the cyclic heat treatment did not result in obvious differences in the mechanical properties compared with those of simple quenched and tempered steel when hydrogen was not introduced into the specimens. Hydrogen charging caused intergranular and quasi-cleavage cracking, and both cracking modes were restricted by cyclic heat treatment. An important feature observed in the steel subjected to cyclic heat treatment was frequent crack deflection and crack tip blunting, which occurred at block and prior austenite grain boundaries (triple junctions). Therefore, grain refinement increased the probability of crack deflection and crack tip blunting. In addition, the relatively low dislocation density in cyclically heat-treated steel is believed to contribute to the suppression of plasticity-related damage nucleation, which is critically important for quasi-cleavage cracking.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Hydrogen embrittlement, Martensitic steel, Grain size

刊行年月日: 2024-05-24

出版者: Elsevier BV

掲載誌:

• International Journal of Hydrogen Energy (ISSN: 03603199) vol. 136 p. 731-741

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.ijhydene.2024.05.327

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更新時刻: 2025-05-29 16:30:11 +0900

MDRでの公開時刻: 2025-05-29 16:19:48 +0900