Effects of low-temperature treatments on surface hardness, retained austenite content, residual stress condition and the resulting tooth root bending strength of case-hardened 18CrNiMo7-6 gears

D. Kratzer, F. Dobler, T. Tobie, T. Hoja, M. Steinbacher, K. Stahl

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

This paper contains parts of the research project FVA 612 and investigates the correlation between low-temperature treatments of case-hardened gears made from the material 18CrNiMo7-6 and the resulting surface hardness, retained austenite content, and residual stress condition. These parameters were further investigated with regard to the tooth root bending strength obtained with pulsating test rigs. The tested gears were subjected to various low-temperature treatments including different temperature levels before or after tempering. Other investigated parameters were the application of a shot blasting treatment and the effect of low-temperature treatments on gears with increased retained austenite content after the carburizing process.

Original languageEnglish
Pages (from-to)7350-7357
Number of pages8
JournalProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
Volume233
Issue number21-22
DOIs
StatePublished - 1 Nov 2019

Keywords

  • Gears
  • case-hardening
  • cryogenic treatment
  • low temperatures
  • material properties
  • residual stresses
  • retained austenite
  • surface hardness
  • tooth root bending strength

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