Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effects of Heat Treatment Temperature on Microstructure and Mechanical Properties of M2 High-Speed Steel Selective Laser Melting Samples

Version 1 : Received: 13 May 2020 / Approved: 15 May 2020 / Online: 15 May 2020 (03:42:17 CEST)

How to cite: Ding, H.; Xiang, X.; Liu, R.; Xu, J. Effects of Heat Treatment Temperature on Microstructure and Mechanical Properties of M2 High-Speed Steel Selective Laser Melting Samples. Preprints 2020, 2020050246 (doi: 10.20944/preprints202005.0246.v1). Ding, H.; Xiang, X.; Liu, R.; Xu, J. Effects of Heat Treatment Temperature on Microstructure and Mechanical Properties of M2 High-Speed Steel Selective Laser Melting Samples. Preprints 2020, 2020050246 (doi: 10.20944/preprints202005.0246.v1).

Abstract

At different heat treatment temperatures, the hardness and flexural strength of M2 high-speed steel selective laser melting (SLM) parts show mixed trends. When the heat treatment temperature is 260°C, the hardness and flexural strength of the M2 high-speed steel SLM part are decreased, but the hardness difference between the upper and lower surfaces of the M2 high-speed steel SLM part is also reduced. When the heat treatment temperature is 560°C, the hardness and flexural strength of the M2 high-speed steel SLM part are almost close to that of the original M2 high-speed steel SLM part, and the performance gradient in the sample is improved, and the overall structure is uniform. When the subsequent heat treatment temperature is 860 °C, the hardness of the SLM parts reaches a minimum, with an average value of 24 HRC. However, the flexural strength exceeds that of the original SLM parts. Moreover, the microstructure of the sample is uniform, which significantly improves the anisotropy of performance.

Subject Areas

high-speed steel (HSS); selective laser melting (SLM); annealing; microstructure; hardness; flexural strength

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