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

被引：0
作者：
Chao Gu
Yan-ping Bao
Peng Gan
Min Wang
Jin-shan He
机构：
[1] University of Science and Technology Beijing,State Key Laboratory of Advanced Metallurgy
[2] RWTH Aachen University,Steel Institute
来源：
International Journal of Minerals, Metallurgy, and Materials | 2018年 / 25卷
关键词：
very high cycle fatigue; bearing steel; inclusions; tessellated stress; crack initiation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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页码：623 / 629
页数：6
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