Fatigue strength of a vacuum-carburised TRIP-aided martensitic steel

Koh ichi Sugimoto, Tomohiko Hojo, Yuta Mizuno

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Fatigue properties of a transformation-induced plasticity-aided martensitic steel subjected to vacuum carburisation under carbon potentials ranging from 0.70 to 0.80 mass% and subsequent fine-particle peening were investigated for the fabrication of precision transmission gears. The fatigue limits of smooth specimens increased by 34–41% with increasing carbon potential, compared with that of heat-treated and fine-particle peened steel. The notched fatigue limits increased to a lesser degree except in case of carbon potential of 0.70 mass%. The increased smooth fatigue limits were associated with the high Vickers hardness and compressive residual stress via severe plastic deformation and the strain-induced martensitic transformation during fine-particle peening, as well as a 50% reduction of retained austenite fraction during fatigue deformation.

Original languageEnglish
Pages (from-to)743-750
Number of pages8
JournalMaterials Science and Technology (United Kingdom)
Volume34
Issue number6
DOIs
Publication statusPublished - 2018 Apr 13

Keywords

  • Fatigue strength
  • TRIP-aided martensitic steel
  • Vickers hardness
  • carbon potential
  • fine-particle peening
  • residual stress
  • retained austenite
  • vacuum carburisation

ASJC Scopus subject areas

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

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