The dilatometric curves of B1500HS high-strength steel at different heating rates were measured by a Gleeble-3800 thermal simulator and analyzed to investigate the effect of heating rate on austenitization. Results show that the value of starting temperature and ending temperature of austenite transformation increase with the rise of heating rates, whereas the temperature interval of austenite formation decreases. The kinetic equation of austenite transformation was solved using the Johnson-Mehl-Avrami model, and the related parameters of the equation were analyzed by the Kissinger method. For those calculations, the activation energy of austenite transformation is 1.01 × 10⁶ J/mol, and the values of kinetic parameters n and ln k₀ are 0.63 and 103.03, respectively. The relationship between the volume fraction of austenite and the heating time at different heating rates could be predicted using the kinetic equation. The predicted and experimental results were compared to verify the accuracy of the kinetic equation. The microstructure etched by different corrosive solutions was analyzed, and the reliability of kinetic equation was further verified from the microscopic perspective.

用Gleeble-3800热模拟仪测量了B1500HS高强度钢在不同加热速率下的膨胀曲线，并进行了分析，以研究加热速率对奥氏体化的影响。结果表明，随着加热速率的提高，奥氏体转变的起始温度和终止温度值均增大，而奥氏体形成的温度间隔减小。用Johnson-Mehl-Avrami模型求解奥氏体转变的动力学方程，并用Kissinger方法分析该方程的相关参数。对于这些计算，奥氏体转变的活化能为1.01×10 ⁶ J / mol，动力学参数n和ln k _0的值分别为0.63和103.03。利用动力学方程可以预测奥氏体体积分数与不同加热速率下加热时间的关系。比较了预测结果和实验结果，以验证动力学方程的准确性。分析了不同腐蚀性溶液腐蚀后的微观结构，并从微观角度进一步验证了动力学方程的可靠性。