Effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue regime

Chao Gu; Yan-ping Bao; Peng Gan; Min Wang; Jin-shan He

doi:10.1007/s12613-018-1609-4

Volume 25 Issue 6

Jun. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(6): 623-629

Chao Gu, Yan-ping Bao, Peng Gan, Min Wang, and Jin-shan He, Effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue regime, Int. J. Miner. Metall. Mater., 25(2018), No. 6, pp. 623-629. https://doi.org/10.1007/s12613-018-1609-4

Cite this article as:

Chao Gu, Yan-ping Bao, Peng Gan, Min Wang, and Jin-shan He, Effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue regime, Int. J. Miner. Metall. Mater., 25(2018), No. 6, pp. 623-629. https://doi.org/10.1007/s12613-018-1609-4

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Research Article

Effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue regime

+ Author Affiliations

Corresponding author:
Yan-ping Bao E-mail: baoyp@ustb.edu.cn
Received: 6 September 2017; Revised: 4 December 2017; Accepted: 27 December 2017

Abstract

Abstract

This work aims to investigate the effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue (VHCF) regime. The size and type of inclusions in the steel were quantitatively analyzed, and VHCF tests were performed. Some fatigue cracks were found to be initiated in the gaps between inclusions (Al₂O₃, MgO-Al₂O₃) and the matrix, while other cracks originated from the interior of inclusions (TiN, MnS). To explain the related mechanism, the tessellated stresses between inclusions and the matrix were calculated and compared with the yield stress of the matrix. Results revealed that the inclusions could be classified into two types under VHCF; of these two, only one type could be regarded as holes. Findings in this research provide a better understanding of how inclusions affect the high cycle fatigue properties of bearing steel.
- very high cycle fatigue;
- bearing steel;
- inclusions;
- tessellated stress;
- crack initiation

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