Effect of mezzo-heterogeneous microstructure and rolling on the tooth root bending fatigue properties of sintered Ni alloy steel gears

Terukazu Tokuoka, Torn Yamamoto, Kentaro Kudo, Fujio Tsumori, Hideshi Miura, Takao Nishioka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study aims at reducing costs of high load gear manufacturing, and substituting P/M gears for conventional wrought steel gears. In order to improve the fatigue strength of P/M gears, we focused on the rolling and the high performance sintered and heat treated 4600 series alloy steels with mezzo-heterogeneous microstructure which were made from the mixed elemental powders. The fatigue strength was determined by single tooth root bending fatigue test machine, and the effect of mezzo-heterogeneous microstructure and rolling on the fatigue strength was mainly investigated. The endurance limit at N=3.0× 106 of the 500 μn rolled 6%Ni alloy steel gear compact showed 950 MPa which value is about 2/3 of the case hardened wrought steel (SCM415) gears. However, the endurance limit of rolled and heat treated gear compact showed lower value (630 MPa) as compared to as-rolled gear compact. This seems to be due to the decreasing the compressive residual stress by heat treatment and unfavorable mezzo-heterogeneous microstructures.

Original languageEnglish
Pages (from-to)350-354
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume58
Issue number6
DOIs
Publication statusPublished - Jun 2011

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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