Effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue regime
Effect of main inclusions on crack initiation in bearing steel in the very high cycle fatigue regime
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DOI：
10.1007/s12613-018-1609-4
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
Chao Gu;Y. Bao;P. Gan;Min Wang;Jin-shan He
中科院分区：
文献类型：
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作者：
Chao Gu;Y. Bao;P. Gan;Min Wang;Jin-shan He
研究了轴承钢中主要夹杂物对超高周疲劳裂纹萌生的影响。定量分析了钢中夹杂物的大小和类型，并进行了VHCF试验。疲劳裂纹的萌生部位主要是夹杂物（Al_2O_3、MgO-Al_2 O_3）与基体之间的间隙，而疲劳裂纹的萌生部位主要是夹杂物（TiN、MnS）内部。为了解释相关的机制，计算了夹杂物和基体之间的镶嵌应力，并与基体的屈服应力进行了比较。结果表明，在VHCF条件下，夹杂物可分为两类，其中一类可视为孔洞。这项研究的结果提供了一个更好的理解夹杂物如何影响轴承钢的高周疲劳性能。
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.