基板温度对选择性激光熔覆法制备M2高速钢组织与性能的影响

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Abstract M2 high-speed steels were prepared by selective laser melting (SLM) with the substrate temperature of 100, 150 and 200 ℃ respectively. The effects of substrate temperature on the microstructure and mechanical properties of the samples were studied. The results show that increasing of substrate temperature is beneficial to increase the density and uniformity of M2 high-speed steel. When the substrate temperature is 200 ℃, the microstructure of the SLM sample is more uniform and dense, the solid solution of each element and the content of carbide is high. The direction of the columnar crystals no longer grows only along the Z-axis direction. At the same time, the sample with 200 ℃ substrate temperature has the maximum microhardness of 1 150 HV_0.1, which is increased by 40% compared with the samples with 100 ℃substrate temperature. With increasing substrate temperature from 100 ℃ to 200 ℃, the tensile strength of M2 high-speed steel at room temperature printed along the Z-axis decreases from 865.23 MPa to 443.85 MPa, due to the decrease of the number of columnar grains in a single direction.

Key words： selective laser melting (SLM) high-speed steel substrate temperature density microhardness tensile strength

Received: 09 March 2018 Published: 12 July 2019

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	Articles by authors
	DING Huan
	LIU Rutie
	XIONG Xiang
	XU Jie
	CHEN Jie
	LIAO Ning

Cite this article:

DING Huan,LIU Rutie,XIONG Xiang, et al. Effects of substrate temperature on microstructure and property of M2 high-speed steel prepared by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 511-517.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/511

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