广义帕累托分布在轴承钢夹杂物评价方面的应用

doi:10.13228/j.boyuan.issn1006-9356.20200629

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Abstract The non-metallic inclusions in four batches of ultra-clean GCr15 bearing steels produced in both China and Japan were scanned and measured by ASPEX and then classified into three categories, i.e. TiN, oxides and the sulfur-oxygen composite. And the inclusions were also analyzed by the Generalized Pareto Distribution (GPD) probability model. It was found that the maximum inclusion limit sizes of TiN in all four batches can be calculated by the GPD model. However, they could not be calculated for both oxide and sulfur-oxygen composite inclusions in some cases due to a small number of extreme values far greater than the average value. This was because oxide inclusions may grow to an extremely large size due to accidental collisions and aggregation during the floating process after generation, and sulfides are easy to encapsulate oxides to form large sulfur-oxygen composite inclusions. Different from these two types of inclusions, TiN inclusions were mostly precipitated during the solidification of molten steel, and the possibility of aggregation and growth was small. In addition, the GPD calculation results indicated that the maximum oxide inclusion limit sizes in the BOF process was smaller than that in the EAF process, suggesting that the former was better for controlling oxides. However, the relationship between the size of sulfur-oxygen composite inclusions and the smelting process was more complex and had no obvious regularity.

Key words： bearing steel inclusion Generalized Pareto Distribution maximum size estimated size

Received: 05 November 2020

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	XU Lin-hong
	LUO Hai-wen

Cite this article:

XU Lin-hong,LUO Hai-wen. Application of Generalized Pareto Distribution in evaluation of inclusions in bearing steels[J]. China Metallurgy, 2021, 31(6): 19-25.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20200629 OR http://www.zgyj.ac.cn/EN/Y2021/V31/I6/19

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