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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)126-130
Number of pages5
JournalScripta Materialia
Volume176
DOIs
Publication statusPublished - Feb 2020

Fingerprint

austenitic stainless steels
notches
Austenitic stainless steel
phase transformations
Phase transitions
Fatigue of materials
crack initiation
Martensitic transformations
martensitic transformation
Crack initiation
plastic properties
hardening
Plasticity
Hardening
plastics
Plastics
Fatigue strength
Fatigue cracks

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Cite this

Dynamic improvement of fatigue strength via local phase transformation in a circumferentially-notched austenitic stainless steel under fully-reversed loading condition. / Nagaishi, Naoaki; Okazaki, Saburo; Ogawa, Yuhei; Matsunaga, Hisao.

In: Scripta Materialia, Vol. 176, 02.2020, p. 126-130.

Research output: Contribution to journalArticle

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