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采用SLX-80深冷处理系统对T15M粉末高速钢进行深冷处理,采用综合物理测试系统的振动样品磁强计选件(PPMS-VSM)测试样品的室温磁性和热磁性。结果表明:T15M钢在843 K×1 h的回火过程中,在保温和降温阶段出现残留奥氏体向马氏体的转变。在300～10 K之间深冷处理过程中,降温时在110～10 K温度段磁性随温度下降而下降,升温时在40～230 K温度段磁性随温度上升而上升,分别对应于马氏体中碳化物的析出和残留奥氏体向马氏体的转变。深冷处理提前了残留奥氏体向马氏体的转变,抑制了残留奥氏体中碳化物的析出,促进了马氏体中细小碳化物的析出。在第1次回火前或后增加1次深冷处理,可使第3次回火后钢的硬度分别提高2.0 HRC和1.4 HRC。
The cryogenic treatment of T15M powder HSS with SLX-80 cryogenic treatment system was carried out, and the room temperature magnetic and thermomagnetic properties of the samples were tested by PPMS-VSM with integrated physical test system. The results show that during the tempering process of T15M steel at 843 K × 1 h, the transformation from retained austenite to martensite occurs during the holding and cooling phases. During the cryogenic treatment between 300 K and 10 K, the magnetic properties decrease with the decrease of temperature in the temperature range of 110 K to 10 K, and the magnetic properties increase with the increase of temperature at the temperature range of 40 K to 230 K at the temperature rising, corresponding to martensite Precipitation of Carbides and Transformation of Residual Austenite to Martensite. Cryogenic treatment advanced the transformation of retained austenite to martensite, inhibited the precipitation of retained austenite carbides, and promoted the precipitation of fine carbides in martensite. In the first tempering before or after 1 additional cryogenic treatment, the hardness of the steel after the third tempering were increased 2.0 HRC and 1.4 HRC.