Torsional fatigue strength of newly developed case hardening TRIP-aided steel

Koh Ichi Sugimoto, Tomohiko Hojo, Yuta Mizuno

Research output: Contribution to journalArticle

1 Citation (Scopus)


The torsional fatigue strength of newly developed case hardening steel, i.e., transformation-induced plasticity-aided martensitic steel subjected to vacuum carburizing followed by fine particle peening, was investigated for the fabrication of downsized precision gears with high torque capacity and wear resistance. The surface-hardened layer properties—i.e., high Vickers hardness, high compressive residual stress, and a large amount of retained austenite—considerably increased the torsional fatigue limits of vacuum-carburized and fine particle peened TM and JIS-SNCM420 steels, although the notch-sensitivity to fatigue was increased. The relation between torsional and rotational bending fatigue limits for the smooth specimens was found to be between the maximum principal stress and the minimum shear strain energy criterions. On the other hand, this relation for the notched specimens was represented through the maximum principal stress criterion.

Original languageEnglish
Article number375
Issue number9
Publication statusPublished - 2017 Sep 15


  • Case hardening steel
  • Fine particle peening
  • TRIP-aided steel
  • Torsional fatigue
  • Vacuum carburization

ASJC Scopus subject areas

  • Materials Science(all)

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