1215易切削钢拉拔表面裂纹形成机制分析

doi:10.13228/j.boyuan.issn0449-749x.20190255

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Abstract Surface crack is a common defect of 1215 free cutting steel. In order to explore the cause of surface crack in drawing process of 1215 free cutting steel,the surface crack regions of 1215 free-cutting steel were analyzed and characterized by non-aqueous solution electrolysis,optical microscope and scanning electron microscope. The reason for the surface crack of 1215 free-cutting steel during drawing was studied. The results show that large-sized manganese sulfide inclusions were found at the end of the crack propagation of the sample cross section. There are large-sized manganese sulfide inclusions and slag particles on the inner wall of the crack. It is speculated from the results that slag particles in steel is the main cause of crack initiation, and large-sized manganese sulfide inclusions are the cause of crack propagation. According to the mechanism of crack initiation and propagation,this paper proposes to control the initiation and propagation of cracks by increasing the alkalinity and reduction of the slag and accurately controlling the oxygen content of the refining station.

Key words： free-cutting steel surface crack mold flux manganese sulfide

Received: 06 June 2019

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	Articles by authors
	AI Ke-nan
	ZHANG Pan-pan
	ZHAO Meng-hao
	LI Cheng-liang
	ZHANG Zhi-ming
	FU Jian-xun

Cite this article:

AI Ke-nan,ZHANG Pan-pan,ZHAO Meng-hao等. Analysis of formation mechanism of surface crack of 1215 free-cutting steel during drawing[J]. Iron and Steel, 2020, 55(2): 88-94.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190255 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I2/88

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