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 HV0.1, 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.
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2018, Vol. 23 
