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Wen X.,East China University of Science and Technology | Ding X.,East China University of Science and Technology | Han X.,East China University of Science and Technology | Zhang X.,Ningbo Supervision and Inspection Institute of Product Quality | And 2 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2010

The M42 high speed steel powder with different particle size was fabricated by high energy ball milling, and then sintered by spark plasma sintering (SPS). The high energy ball milling process and SPS sintering behavior of M42 high speed steel powder were studied according to the observation of grain size and morphology of the powder and sintered specimen. The results show that with the ball milling time increasing, while the ball/powder weight ration7:1, the average particle size decrease to an extremum after 48 h then keep constant, and the reunion of the powder is increasing. Relative density of M42 PM high speed steel prepared from 48 h ball milling powder with the SPS sintering process 970°C×10 min×70 MPa is 98.99%, and hardness is 67.4 HRC after heattreatment. With the particle size decreasing, the carbide of M42 PM high speed steel is even smaller and uniform, relative density continuously decreas, while the parlicle size has little effect on its hardness due to reunion of powder. Source


Wen X.,Ningbo Institute of Engineering | Wen X.,East China University of Science and Technology | Chen S.,Ningbo Institute of Engineering | Ding X.,Ningbo Institute of Engineering | And 4 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2010

Powder metallurgy M42 high speed steels(HSS) were prepared by the spark plasma sintering(SPS) technique. The effects of sintering process, heat treatment on microstructures and properties were studied. The results show that compared with traditional powder metallurgy high speed steels, the PM M42 high speed steels prepared by SPS technique have the uniform microstructure with fine grain size and no carbide segregation. The hardness of SPSed PM M42 HSS after quenching at 1180°C and ternary multitempering at 550°C for 1 hour heat treatment could be 1~2 HRC higher than that of conventional sintered ones. Source

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