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Research Article

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

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  • Received: 29 July 2020Revised: 13 November 2020Accepted: 16 November 2020Available online: 17 November 2020
  • In this work, a numerical study of the stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions were conducted with finite element modeling simulations under different assumptions. Fatigue mechanisms were also analyzed accordingly. The results show 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 of the inclusion is larger than the steel matrix, the stress will concentrate inside the inclusion; otherwise, the stress will concentrate in the steel matrix. If there are voids in the interface between inclusions and steel matrix, their effects on the fatigue process differ with their positions relative to inclusions. The void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of the inclusion on fatigue behavior and lead to a sharper stress concentration. The void on the top of inclusion alone the fatigue loading will accelerate the debonding between inclusion and steel matrix.
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In-depth analysis of the fatigue mechanism induced by inclusions for high-strength bearing steels

  • Corresponding author:

    Chao Gu    E-mail: guchao@ustb.edu.cn

  • 1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Department of Mechanical Engineering, Aalto University, Puumiehenkuja 3, 02150 Espoo, Finland

Abstract: In this work, a numerical study of the stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions were conducted with finite element modeling simulations under different assumptions. Fatigue mechanisms were also analyzed accordingly. The results show 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 of the inclusion is larger than the steel matrix, the stress will concentrate inside the inclusion; otherwise, the stress will concentrate in the steel matrix. If there are voids in the interface between inclusions and steel matrix, their effects on the fatigue process differ with their positions relative to inclusions. The void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of the inclusion on fatigue behavior and lead to a sharper stress concentration. The void on the top of inclusion alone the fatigue loading will accelerate the debonding between inclusion and steel matrix.

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