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Materials Science and Engineering of Powder Metallurgy  2019, Vol. 24 Issue (3): 273-281    DOI:
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Effects of carbon content on microstructure and properties of M2 high speed steel prepared by elemental powder method
WU Wendeng, XIONG Xiang, LIU Rutie, LUAN Huaizhuang, HAO Yanrong
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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Abstract  The element powder was used as the raw material, the uniformly distributed mixed powder was obtained by two steps ball-milling, and M2 high speed steel was obtained by compression molding and vacuum sintering. The effects of carbon contents on the phase composition, microstructure, density, bending strength and hardness of high speed steel were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and mechanical property testing. The results show that increasing the carbon contents can decrease the sintering temperature and achieve densification at lower temperature. The main components of the sintered samples are α-Fe, M6C carbides, MC carbides, and austenite. With the increase of carbon contents, the porosity of M2 high-speed steel decreases and the amount of granular carbides with regular shape increases, which is beneficial to the improvement of bending strength and hardness of the material. However, excessive carbon contents will lead to the precipitation and growth of carbides at grain boundaries and reduce the strength of high-speed steel.
Key wordspowder metallurgy      high speed steel      elemental powder      mechanical properties      microstructure     
Received: 03 January 2019      Published: 11 July 2019
ZTFLH:  TF124  
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WU Wendeng
XIONG Xiang
LIU Rutie
LUAN Huaizhuang
HAO Yanrong
Cite this article:   
WU Wendeng,XIONG Xiang,LIU Rutie, et al. Effects of carbon content on microstructure and properties of M2 high speed steel prepared by elemental powder method[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 273-281.
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