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The high-cycle fatigue strength of 22Cr-12Ni austenitic stainless steel was evaluated at 77 K for three types of materials with partially recrystallized (PR), finely recrystallized (FR), and solution-treated (ST) microstructures. Subsurface crack initiation was detected at the lower stress level and/or higher cycles in the materials, such that the fatigue crack initiation sites were shifted from the specimen surface to the interior of the specimen with increasing cycles. The ST showed a significant decrease in fatigue strength over 106 cycles due to subsurface crack initiation. Both PR and FR showed a significant improvement in their high-cycle fatigue strength in the high-cycle regime, although the increase in fatigue strength in the low-cycle regime was approximately equal to the increase in tensile strength.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: austenitic stainless steel, high-cycle fatigue property, cryogenic temperature

Date published: 2024-05-01

Publisher: IOP Publishing

Journal:

• IOP Conference Series: Materials Science and Engineering (ISSN: 17578981) vol. 1302 issue. 1 012001

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5162

First published URL: https://doi.org/10.1088/1757-899x/1302/1/012001

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Updated at: 2024-12-17 16:30:37 +0900

Published on MDR: 2024-12-17 16:30:37 +0900