Influence of Non-Metallic Inclusions on Very High-Cycle Fatigue Performance of High-Strength Steels and Interpretation via Crystal Plasticity Finite Element Method

Author:

Zhao Yingxin1ORCID,Ren Guoqiang1,Chen Liming1,Gu Guoqing2ORCID,Zhu Junchen3,Zhao Aiguo3

Affiliation:

1. Standards & Metrology Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100010, China

2. College of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China

3. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China

Abstract

The fatigue behaviors of high-strength bearing steel were investigated with rotating bending fatigue loading with a frequency of 52.5 Hz. It was revealed that the high-strength steel tended to initiate at interior non-metallic inclusions in a very high-cycle fatigue regime. During fractography observation, it was also seen that the inclusion acting as a failure-originating site was seldom smaller than 10 μm. Moreover, prior austenite grains could also act as the originating source of failure when inclusion was absent. The crystal plasticity finite element method (CPFEM) was adopted to simulate the residual stress distribution around non-metallic inclusions of different sizes under different loading amplitudes. The accumulated plastic strain around the inclusion suggested that the existence of inclusion may reduce material strength and lead to more fatigue damage. The value of accumulated plastic strain around different inclusion sizes also resembled the crack nucleation or propagation of the materials. The simulation results also indicated that inclusions smaller than 5 μm had little influence on fatigue lifetimes, while inclusions larger than 10 μm had a significant influence on fatigue lifetimes.

Funder

China Academy of Railway Sciences Corporation Limited

China Railway Co. Ltd.

Publisher

MDPI AG

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