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Enhancement of thermally activated dislocation motion by solute hydrogen (H) has been envisaged in Fe–Cr–Ni austenitic steel through accelerated stress relaxation and a prolonged creep duration. Nevertheless, differences in the imposed stress/strain between the compared non- and H-charged samples at the starts of these mechanical transients, as well as involvements of other obstacles (e.g., alloying elements and forest dislocations), mask the essential effects of H. We performed stress relaxation and strain rate jump tests at multiple stress/strain for Type310S austenitic steel with ∼7600 at ppm H at 296 K. The measured strain rate sensitivity (SRS) was evaluated via a methodology so-called Haasen plot. By screening the latent factors above, primary role of H was revisited: they work as short-range obstacles, hindering the dislocation movement. Multiple H atoms potentially participate in each thermal activation event, giving rise to a stress-equivalent activation volume and a proportionality between H concentration and yield strength.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Austenitic steel, Hydrogen, Dislocation mobility, Thermal activation, Solute strengthening

刊行年月日: 2024-06-14

出版者: Elsevier BV

掲載誌:

• International Journal of Hydrogen Energy (ISSN: 03603199) vol. 74 p. 170-182

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.2024.06.113

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更新時刻: 2024-08-09 08:30:10 +0900

MDRでの公開時刻: 2024-08-09 08:30:10 +0900