Evaluation of yield stress distribution in the surface layer and fatigue properties of the stainless steel modified by cavitation peening

Masaaki Nishikawa, Osamu Takakuwa, Hitoshi Soyama

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Abstract

The present study evaluated the yield stress distribution in the surface layer and the fatigue properties of a steel SUS316L modified by cavitation peening (CP). The yield stress was evaluated based on micro-indentation tests using a spherical indenter. Especially, a technique of inverse analysis using elastic-plastic finite element analyses was utilized to determine the yield stress from the results of indentation tests, at which the effect of compressive residual stress introduced by CP was excluded. The identified results revealed that the surface with 50 μm in thickness was remarkably work-hardened by CP, and that the yield stress was increased within 500 urn in depth from the surface. Moreover, the plane bending fatigue tests demonstrated that the fatigue limit of the specimen was increased from 277 MPa to 362 MPa by C.P. Therefore, we can conclude that CP is effective for introducing a high yield stress on the metal surface, which suppresses the initiation of surface crack during fatigue cycles.

Original languageEnglish
Pages (from-to)1367-1372
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume76
Issue number770
DOIs
Publication statusPublished - Oct 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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