Surface-hardened layer properties of newly developed casehardening steel

Koh Ichi Sugimoto, Tomohiko Hojo, Yuta Mizuno

Research output: Contribution to journalReview article

4 Citations (Scopus)

Abstract

The effects of fine-particle peening conditions on the surface-hardened layer properties of newly developed case-hardening steel, i.e., transformation-induced plasticity-aided steel with a chemical composition of 0.2% C, 1.5% Si, 1.5% Mn, 1.0% Cr, 0.2% Mo, and 0.05% Nb (mass%) were investigated for the fabrication of automotive drivetrain components. The surface roughness decreased with decreasing arc-height of fine-particle peening after vacuum carburization. A white layer developed on the surface of the steel peened at arc-heights greater than 0.41 mm (N). The maximum Vickers hardness and maximum compressive residual stress increased with increasing arc-height in the steel. These values were higher than those of commercial case-hardening steels. The increased volume fraction and expansion strain of the strain-induced martensite increased the hardness and compressive residual stress in the surface-hardened layer of the steel, although severe plastic deformation made a substantial contribution to enhancing the surface-hardened layer properties.

Original languageEnglish
Pages (from-to)727-733
Number of pages7
JournalIsij International
Volume58
Issue number4
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • Case-hardening steel
  • Fine-particle peening
  • Hardness
  • Residual stress
  • Strain-induced martensite transformation
  • TRIP-aided steel
  • Vacuum carburization

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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