In-depth analysis of the fatigue mechanism induced by inclusions for high-strength bearing steels

Chao Gu, Wen qi Liu, Jun he Lian, Yan ping Bao*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A numerical study of stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions was conducted with finite element modeling simulations under different assumptions. Fatigue mechanisms were also analyzed accordingly. The results showed that the effects of inclusions on fatigue life will distinctly decrease if the mechanical properties are close to those of the steel matrix. For the inclusions, which are tightly bonded with the steel matrix, when the Young’s modulus is larger than that of the steel matrix, the stress will concentrate inside the inclusion; otherwise, the stress will concentrate in the steel matrix. If voids exist on the interface between inclusions and the steel matrix, their effects on the fatigue process differ with their positions relative to the inclusions. The void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of inclusions on fatigue behavior and lead to a sharp stress concentration. The void on the top of inclusion along the fatigue loading direction will accelerate the debonding between the inclusion and steel matrix.

Original languageEnglish
Number of pages9
JournalInternational Journal of Minerals, Metallurgy and Materials
DOIs
Publication statusPublished - 10 Feb 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • fatigue
  • high-strength bearing steel
  • inclusion
  • numerical study
  • stress distribution

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