PMO对高速钢枝晶组织及碳化物的影响

doi:10.13228/j.boyuan.issn0449-749x.20230374

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Abstract In order to solve the problems of developed dendrite structure,uneven distribution of carbide network and eutectic carbides in high-speed tool steel on natural cooling conditions. The Center for Advanced Solidification Technology of Shanghai University used a unique dual-power vacuum induction melting device,applying Pulse Magneto-oscillation (PMO) for external field intervention during the natural solidification of high-speed steel. The results show that with PMO treatment,the developed dendrites in the as-cast microstructure of high-speed steel are transformed into equiaxed grains. PMO technology can effectively optimize the as-cast microstructure and morphology of high-speed steel,refine the size of carbide network and eutectic carbide,and improve the uniformity of carbide distribution. PMO has a significant refinement effect on the size of the eutectic carbide network intersection of high-speed steel. Taking the refinement of the eutectic carbide network intersection size of M2 high-speed steel as an example,the average size of the carbide intersection at 1/8D,1/4D,and 1/2D (where D is the radial diameter of the casting bille)is reduced by 48.5%,47.1%,and 43.4%,respectively,compared to the ingots without PMO treatment. Meanwhile,PMO can further refine the size of eutectic carbide particles. Taking M2Al high-speed steel as an example,the average size of eutectic carbide particles at 1/8D,1/4D,and 1/2D decreases by 49.1%,54.5%,and 40.2%,respectively. It provides a new idea and method to solve the cracking phenomenon in the process of high-speed steel pressure machining with large deformation and improve its yield. It also provides a new direction for improving the problems encountered during high-speed steel continuous casting,such as the aggregation of carbides in the center and coarse carbides.

Key words： PMO high-speed steel solidification as-cast structure dendritic structure eutectic carbide

Received: 02 July 2023

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	LIU Haining
	CHEN Yangmin
	CHEN Xiangru
	LI Lijuan
	ZHAI Qijie

Cite this article:

LIU Haining,CHEN Yangmin,CHEN Xiangru等. Effect of PMO on dendritic structure and carbide of high-speed steel[J]. Iron and Steel, 2024, 59(2): 119-128.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230374 OR http://www.chinamet.cn/Jweb_gt/EN/Y2024/V59/I2/119

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