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利用导磁率所测得的一种 CrMoVA 结构钢经930℃奥氏体化后,在不同温度等温冷却的条件下的转变动力学数据,可用来进行数值模拟。得到 x(t)=1-exp(at~b+ct~d)的数学表达式来描述扩散性相变的生核及其长大的动力学过程,并进行仿真计算。据此计算出钢的等温冷却转变图(TTT 图)。经过误差分析后,获得模拟计算方差小于0.3的结果。证实这种方程适用于对钢过冷奥氏体的扩散型相变进行仿真计算,并可通过不同等温区域内钢的模拟相变激活能数值的变化规律来研究等温相变的机制;为研究钢的相规律提供一种解析计算的方法。
The kinetic data of the transformation of CrMoVA structural steel measured by magnetic permeability after being austenitized at 930 ℃ under isothermal cooling at different temperatures can be used for numerical simulation. The mathematical expressions of x (t) = 1-exp (at ~ b + ct ~ d) are obtained to describe the nucleation and growth kinetics of diffusive phase transitions and to simulate them. Based on this calculation, the isothermal cooling transformation diagram (TTT chart) of the steel was calculated. After the error analysis, the result of simulated calculation is less than 0.3. It is proved that this equation is suitable for the simulation calculation of diffusion-type phase transformation of undercooled austenite and the mechanism of isothermal transformation can be studied by the variation law of numerical values of phase transition activation energy of steel in different isothermal regions. The law of steel provides a method of analytical calculation.