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采用放电等离子烧结技术(SPS)制备了M3∶2粉末冶金高速钢,研究了SPS烧结M3∶2粉末冶金高速钢最佳烧结温度、显微组织与性能。通过实验得到以10℃/min的速率升到1200℃时高速钢的连续升温烧结曲线,分析在此烧结实验下的烧结过程,进而确定烧结温度范围。在此范围内的不同温度下烧结试样,根据试样密度、硬度、相对密度和显微组织确定M3∶2粉末高速钢最佳烧结温度。结果表明:在烧结温度900℃、保温时间10min、压力30MPa工艺下,SPS烧结的M3∶2粉末冶金高速钢,其显微组织均匀、晶粒细小、无碳化物偏析,相对密度达98.17%,硬度达63.37 HRC。
M3: 2 powder metallurgy high speed steel was prepared by spark plasma sintering (SPS). The optimum sintering temperature, microstructure and properties of SPS sintered M3: 2 powder metallurgy high speed steel were studied. Through the experiment, the continuous temperature rising sintering curve of high speed steel was obtained when the temperature increased to 1200 ℃ at a rate of 10 ℃ / min. The sintering process under this sintering experiment was analyzed and the sintering temperature range was determined. In this range of sintered samples at different temperatures, according to the sample density, hardness, relative density and microstructure to determine the best sintering temperature of M3: 2 powder HSS. The results showed that the SPS sintered M3: 2 powder metallurgy high speed steel with the sintering temperature of 900 ℃, holding time of 10min and pressure of 30MPa has uniform microstructure and fine grain without carbide segregation, the relative density reaches 98.17% Hardness of 63.37 HRC.