电子束熔炼对高速钢碳化物的影响

doi:10.13228/j.boyuan.issn0449-749x.20200258

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Abstract The fine and dispersed carbides are the guarantee of the excellent performance of high-speed steel, but the complex alloy composition leads to coarse carbides and severe segregation in the as-cast high-speed steel. In order to explore the effect of electron beam melting on as-cast high-speed steel and improve the structure and carbide state of high-speed steel, electron beam melting technology to prepare M35 high-speed steel and characterize its composition and structure was used. The results show that the average dendrite spacing in EBM-M35 high-speed steel is 20 μm, the size of carbides is fine, and they are evenly distributed in the structure. The main types are MC and M₂C, and the M₂C carbides change from lamellar to fibrous. During heat treatment of as-cast EBM-M35 high-speed steel, it was found that the carbide fractured and spheroidized after being kept at 1 180 ℃ for 30 min to achieve the effect of refining the carbide and dispersing the carbide in the structure. Furthermore, the fracture and spheroidization of carbides in EBM-M35 high-speed steel can be completed at a lower temperature or shorter heat treatment time, and the microstructure optimization of as-cast high-speed steel can be completed at a lower cost. It provides a more excellent basis for the deformation and refinement of as-cast high-speed steel.

Key words： electron beam melting M35 high-speed steel carbide high temperature heat treatment complex alloy composition

Received: 14 May 2020

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	Articles by authors
	SUN Man-yi
	TAN Yi
	WANG Yi-lin
	ZHUANG Xin-peng
	ZHANG Feng
	WANG Yi-nong

Cite this article:

SUN Man-yi,TAN Yi,WANG Yi-lin等. Effect of electron beam melting on carbide of high speed steel[J]. Iron and Steel, 2021, 56(3): 103-110.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200258 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I3/103

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