本文根据在淬过火的转子上用计算确定的内应力并运用线性断裂机理试图评定转子在不同规范淬火时产生淬火裂纹的危险性。研究表明:转子不仅可以在油中淬火而且可以在水中淬火。可是零件心部贝氏体转变起始温度(550～600℃)时(P2M钢),轴向最大拉应力达900Mna;在珠光体转变的直径小于转子直径的35%时,残余拉应力达1500Mna,这些条件下不宜采 This paper attempts to assess the risk of quench cracking of the rotor during different specifications of quenching by using the calculated internal stress on the quenched rotor and applying the mechanism of linear fracture. Research shows that the rotor can not only be quenched in oil but also quenched in water. However, the maximum tensile stress in the axial direction can reach 900Mna when the starting temperature of core bainite transformation (550 ~ 600 ℃) of the part (P2M steel) and the residual tensile stress reaches 1500Mna when the diameter of pearlite transformation is less than 35% of the rotor diameter , Under these conditions should not mining