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为了利用数值模拟技术计算感应加热过程中丝杠的奥氏体化情况,利用Gleeble1500D热模拟试验机,测试了55CrMo钢试样在升温速率为0.05~-50 K/s时的膨胀曲线,得到了它的奥氏体化温度与加热速率的关系。根据相变膨胀曲线,利用杠杆定律得到了奥氏体转变量与温度的关系,并对非等温相变Johnson-Mehl-Avrami(JMA)方程中的动力学参数进行了线性回归分析,得到了JMA相变动力学模型。利用数值模拟技术,计算了丝杠在感应加热时的奥氏体化情况和淬火后的硬度曲线,并与实验结果进行对比。结果表明,模拟结果与实验结果吻合得较好,所得到的JMA方程能较好地描述55CrMo钢的奥氏体化过程。
In order to calculate the austenitizing condition of lead screw during induction heating by using numerical simulation technique, the expansion curve of 55CrMo steel sample at a heating rate of 0.05 ~ -50 K / s was tested by Gleeble1500D thermal simulation tester. Its austenitizing temperature and heating rate of the relationship. According to the phase transition expansion curve, the relationship between the amount of austenite transformation and temperature is obtained by the law of leverage. The linear regression analysis of the kinetic parameters in the non-isothermal phase transition Johnson-Mehl-Avrami (JMA) equation is obtained. The JMA Phase change kinetic model. Using numerical simulation technique, the austenitizing condition of lead screw under induction heating and the hardness curve after quenching were calculated, and compared with the experimental results. The results show that the simulation results are in good agreement with the experimental results and the JMA equation obtained can well describe the austenitization process of 55CrMo steel.