采用放电等离子烧结技术制备M42粉末高速钢,研究不同烧结工艺对M42粉末高速钢性能的影响.结果表明:M42粉末高速钢经970℃×10 min×70 MPa SPS烧结后,其显微组织细小均匀、无碳化物偏析,致密度达到96.53%;经1 180℃×5 min+550℃×1h热处理后的硬度达到67.36HRC,与普通M42高速钢相比提高1～2HRC.
Powder metallurgy M42 high speed steel materials were prepared by the spark plasma sintering (SPS) technique. The effects of different sintering process on mechanical properties were studied. The results show that the optimum parameters for the production of M42 high speed steel were as following: sintering temperature of 970℃, holding time of 10 minutes and pressure of 70 Mpa.The best properties of SPSed P/M HSS we obtained are hardness value of 67.36HRC, relative density value of 96.53% after quenching at 1 180℃ and ternary multitempering at 550℃ for 1 hour.
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