硫化物改质对20MnCr5齿轮钢夹杂物和切削性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20210714

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Abstract Gear steel is widely used in automobile, machinery and other drive systems. Free cutting is one of the main ways to improve gear processing efficiency and reduce manufacturing cost. Increasing sulfur content in steel is an effective way to improve the cutting performance of gear steel. However, excessive sulfur will form strip MnS during rolling, which will increase the anisotropy of steel. Therefore, it is necessary to modify the sulfide. 20MnCr5 gear steel was employed and modified with sulfide by Ca treatment and Mg treatment respectively. Through the characterization of mechanical properties, microstructure, inclusion distribution and cutting performance, the influence of different modification methods on the material was compared and analyzed. The results show that the strength and plasticity of steels treated by Ca and Mg are consistent, while the grain size of the sample treated by Mg is smaller, leading to a higher toughness. The amount of MnS inclusions in Ca-treated steel is larger, and the proportion of long strip inclusions is relatively higher by comparing with Mg-treated one. However, Mg treatment can effectively reduce the number of inclusions in steel, increase the average size of inclusions and the number of small aspect ratio inclusions at the same time, however, the number of composite oxide inclusions also increases. The dry cutting tests were carried out at speed range of 240-280 m/min. The results show that both steels appear the front tool surface wear, the flank wear and the boundary wear. The tool wear of the Ca-treated sample is more serious, and the built-up edge and edge breakage phenomenon occur at the higher cutting speed. On the contrary, the sample treated with Mg has a longer tool life and a lower sensitivity to cutting speed. Based on the results obtained, there are more large-size spherical sulfide inclusions in Mg-treated steel, which improves the stress concentration effect and is more conducive to improving the free cutting performance, so the sulfide modification effect is better.

Key words： 20MnCr5 gear steel sulfide modification Aspex characterization inclusions cutting performance

Received: 22 November 2021

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	YU Wen-chao
	ZHANG Xiao-lu
	JIN Guo-zhong
	HU Fang-zhong
	HE Xiao-fei

Cite this article:

YU Wen-chao,ZHANG Xiao-lu,JIN Guo-zhong等. Influence of sulfide modification on inclusions and cutting properties of 20MnCr5 gear steel[J]. Iron and Steel, 2022, 57(5): 99-106.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210714 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I5/99

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