Effect of residual surface stress on the fatigue behavior of a low-alloy powder metallurgy steel

J. J. Williams, X. Deng, Nikhilesh Chawla

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

In this study we have characterized the fatigue behavior of a low-alloy powder metallurgy (P/M) sintered steel, composed mainly of martensite and bainite with 10.4% porosity. After each processing step, the residual axial surface stress was measured by X-ray diffraction. Significant compressive surface stresses were generated during the machining of the fatigue specimens. A heat-treatment at 175 °C after machining had no effect on these residual stresses, but polishing the surface resulted in a 20% reduction in compressive stresses. The residual surface stresses had no apparent effect on the fatigue behavior of the sintered steel. Rather, the fatigue behavior was controlled by sub-surface defects consisting of weakly bonded particles located in regions of high porosity.

Original languageEnglish (US)
Pages (from-to)1978-1984
Number of pages7
JournalInternational Journal of Fatigue
Volume29
Issue number9-11
DOIs
StatePublished - Sep 1 2007

Keywords

  • Fatigue
  • Machining
  • Powder metallurgy
  • Residual stress
  • Steel

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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