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应用非线性三维瞬态温度场与相变耦合的有限元算法，对45钢淬火冷却过程进行计算机模拟，得到直观的三维图象．计算结果与实测值比较接近。本义采用的TTT曲线数值化方法，不仅便于计算机存贮和调用，也便于将现有的TTT图进行处理．得出与工件实际成分相对应的TTT曲线，从而提高相变计算的精度。文中讨论了相变量计算值与实测值出现偏差的原因，并指出用Avrami公式计算等温转变能得到合理的结果．但在应用它计算连续冷却过程的转变量方面．尚存在一些有待解决的问题。
The nonlinear three-dimensional transient temperature field and the phase change coupled finite element method are used to simulate the 45 steel quenching and cooling process to obtain an intuitive three-dimensional image. The calculated result is close to the measured value. The original meaning of the TTT curve numerical method, not only easy for computer storage and transfer, but also easy to deal with the existing TTT chart. Get the TTT curve corresponding to the actual composition of the workpiece, so as to improve the accuracy of the phase change calculation. In this paper, the reason why the calculated value of the phase change deviates from the measured value is discussed. It is pointed out that the Avrami formula can be used to calculate the isothermal transformation to get a reasonable result. But in applying it to calculate the amount of change in the continuous cooling process. There are still some problems to be solved.