Dynamic improvement of fatigue strength via local phase transformation in a circumferentially-notched austenitic stainless steel under fully-reversed loading condition

Naoaki Nagaishi, Saburo Okazaki, Yuhei Ogawa, Hisao Matsunaga

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

The fatigue limit of a circumferentially-notched austenitic stainless steel exhibited peculiar improvement under fully-reversed loading (R =−1), as compared with that under tension-tension loading (R = 0.1), behavior considered to be unconventional in smooth specimens of similar materials. This was attributed to the different cyclic stress-strain responses at the notch-root, where it was almost elastic at R = 0.1, whereas an elasto-plastic response continued up to later stage of the fatigue process at R =−1. Such cyclic plasticity enhanced martensitic transformation locally and resulted in hardening, thereby restricting fatigue crack initiation from the notch-root.

本文言語英語
ページ(範囲)126-130
ページ数5
ジャーナルScripta Materialia
176
DOI
出版ステータス出版済み - 2月 2020

!!!All Science Journal Classification (ASJC) codes

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 金属および合金

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