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以金相方法测定9XC钢的M点及下石氏体(贝茵体)转变的开始曲线。以磁性方法测定9XC钢在不同情况下奥氏体的稳定化作用。测定了残余奥氏体含量和9XC丝锥的变形量之间的关系。以φ24X2毫米铣牙丝锥进行工厂实际试验的结果证明,先淬火至160°停留1—3分钟,然后升至240°等温停留10分钟的新工艺方案,和在170°等温停留45分钟的工艺方案相比较,能缩短等温时间至1/4,其淬火后工件节径的变形量从0.11％减至0.06％(平均值)。
Metallographic method was used to determine the onset curve of M point and lower austenite (bainite) transformation of 9XC steel. Magnetic stabilization of austenite in 9XC steel under different conditions. The relationship between retained austenite content and the amount of deformation of a 9XC tap was determined. As a result of actual factory mill testing with φ24 × 2 mm tap, it was shown that the first quench to 160 ° for 1-3 minutes, then to 240 ° for isothermal hold for 10 minutes, and 170 ° for isothermal hold for 45 minutes In comparison, the isothermal time can be shortened to 1/4, and the deformation of work piece after quenching can be reduced from 0.11% to 0.06% (average value).