从非等温动力学理论出发，应用扫描量热法，研究了稀土对高碳钢回火过程及马氏体和残余奥氏体分解动力学的影响。结果表明：稀土使马氏体和残余奥氏体分解温度升高，热效应值降低，激活能升高，相变机制发生变化． Based on the theory of non-isothermal kinetics, the effect of rare earth on the tempering process of high carbon steel and the kinetics of martensite and retained austenite decomposition was studied by scanning calorimetry. The results show that the rare earth increases the decomposition temperature of martensite and retained austenite, the thermal effect decreases, the activation energy increases and the phase transformation mechanism changes.