Surface durability of powder-forged roller treated by shot peening

Masanori Seki, Masahiro Fujii, Yuji Kobayashi, Masaaki Sato, Akira Yoshida

Research output: Contribution to journalArticle

Abstract

To investigate the influence of shot peening on the surface durability of powder-forged rollers, the case-hardened powder-forged rollers with a forging density of 7.5 g/cm3 treated by the single shot peening and the double shot peening were fatigue-tested under a sliding-rolling contact condition. The surface roughness, the surface hardness and the surface compressive residual stress of the rollers were increased by the shot peening. In addition, the pores near the roller surface were deformed by the shot peening. The failure mode of all the test rollers was spalling due to subsurface cracking. The fatigue lives of all the test rollers were improved by the shot peening, and that of the test roller S08, which was shot-peened with the hardest steel shots in this experimental range, was especially improved. The surface durability of the test roller S08 was also most improved by the shot peening. Cracks became difficult to occur and propagate under the roller surface since the pores near the roller surface were deformed by the stronger shot peening. In this study, double shot peening, which generally restrains the increase in surface roughness, was not particularly effective for the improvement in the surface durability of the powder-forged rollers, because the influence of tangential force on fatigue was not always great in a case of subsurface cracking.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalJournal of Mechanical Science and Technology
Volume24
Issue number1
DOIs
Publication statusPublished - Feb 1 2010

    Fingerprint

Keywords

  • Hardness
  • Pore
  • Powder-forged material
  • Roller
  • Shot peening
  • Surface durability
  • Surface roughness

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this