激光熔覆无碳Fe-Co-Mo高速钢涂层的组织结构与性能

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Abstract Carbon-free high-speed steel coatings were prepared on 40Cr substrates by synchronous powder-feeding laser cladding technology with water atomized alloy powder as raw material. The microhardness, red hardness and tempering resistance of the coating were tested and analyzed. The effects of process parameters on the morphology and hardness of the coating were studied. The results show that, under suitable parameters, a carbon-free high-speed steel coating without macro cracks and pores was obtained on the surface of the substrate. The coating has high density and low dilution rate, and exhibits a good metallurgical bond with the substrate. The microhardness (HV_0.2) of the coating in the cladding state is 700, and the coating hardness (HV_0.2) is significantly increased to 900 after aging at 600 ℃ for 1 h. After aging at 600 ℃for 1 h for 4 times, the coating hardness (HV_0.2) remains at 800. In addition, after a long time tempering at 600 ℃ for 30 h, the coating can still maintain a hardness (HV_0.2) of 750, which has better tempering resistance than conventional high-speed steel ASP2030 and hot work die steel H13.

Key words： laser cladding carbon-free high speed steel microstructure tempering resistance coating

Received: 16 December 2020 Published: 22 March 2021

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TG142.1

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	XIONG Guo
	XIE Fengwei
	YUAN Ziren
	KANG Xiyue
	HE Yuehui

Cite this article:

XIONG Guo,XIE Fengwei,YUAN Ziren, et al. Microstructure and properties of carbon-free Fe-Co-Mo high speed steel coating prepared by laser cladding[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 84-90.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I1/84

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