Effects of fine particle peening on torsional fatigue strength of a trip-aided bainitic ferrite steel

Yuta Mizuno, Tomohiko Hojo, Koh Ichi Sugimoto

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of fine particle peening (FPP) on the torsional fatigue properties were investigated in the case of a transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) steel that has potential for use in precision gears. FPP resulted in a significant increase in the torsional fatigue limit of the TBF steel, compared with that of a quenched and tempered SNCM420 steel. An increase in the torsional fatigue limit was larger than that in the rotating bending fatigue limit. In addition, the crack growth rate and the threshold stress intensity range of this steel were lower and higher, respectively, than those of its SNCM420 counterpart. These differences resulted from the TBF steel having a higher (1) Vickers hardness, (2) compressive residual stress, and (3) volume fraction of untransformed retained austenite in the surface hardened layer, which suppressed crack initiation and extension.

Original languageEnglish
Pages (from-to)853-858
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume64
Issue number11
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Fine particle peening
  • Hardness
  • Residual stress
  • Retained austenite
  • Strain-induced transformation
  • TRIP-aided bainitic ferrite steel
  • Torsion fatigue strength

ASJC Scopus subject areas

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

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