【摘要】 轧制差厚钢板具有连续变化的厚度特性，因此在退火工艺下不同厚度区域的温度变化路径存在显著差异。这种差异改变了轧制差厚钢板的微观组织及力学性能，进而直接影响其后续成形及服役性能。为掌握退火工艺下轧制差厚钢板具有的性能差异化特性及产生内因，需要对轧制差厚钢板热处理过程中的温度分布及规律进行系统研究。研究所用轧制差厚钢板的几何特征为：薄区、过渡区及厚区纵向长度均为50 mm;薄区厚度1 mm,厚区为1.5 mm,差厚比1.5,过渡区厚度连续变化且无突变。建立了同步考虑轧制差厚钢板厚度连续变化特性及综合传热形式的温度场非稳态理论模型，并通过实验方法验证理论模型准确性。结果表明，在预设退火温度780℃的升温历程中，以薄区达到临界温度的时间(75 s)为测温终点，各厚区最高温度为779.3℃;最高温差135.1℃,整体呈现先增后减的趋势；最大升温速率为21.9℃/s,之后各区域升温速率逐步递减且在到达37 s时各厚区升温速率的高低顺序发生转变。研究通过分析轧制差厚钢板随时间变化的温度分布态势与其内在规律，以期为轧制差厚钢板热处理后的性能差异化预测提供理论基础及有效方法。更多还原

【Abstract】 Under the annealing process, due to the continuous variation of the thickness of the tailor rolled blank, the temperature change paths in different thickness regions are significantly different, which affects the microstructure and mechanical properties of the tailor rolled blank, and more directly affects its subsequent forming and service performance. Therefore, in order to grasp the performance differentiation characteristics and internal causes of the tailor rolled blank under annealing process, it is necessary to systematically study the temperature distribution and law of the tailor rolled blank during heat treatment. The geometric characteristics of the tailor rolled blank are as follows: the longitudinal length of the thin zone, the transition zone and the thick zone is 50 mm; the thickness of the thin zone is 1 mm, the thickness of the thick zone is 1.5 mm, the difference thickness ratio is 1.5,and the thickness of the transition zone changes continuously without mutation. An unsteady theoretical model of temperature field considering the continuous variation characteristics of the thickness of the tailor rolled blank and the comprehensive heat transfer form was established, and the accuracy of the theoretical model was verified by experimental methods. The results show that in the heating process of the preset annealing temperature of 780 ℃,the time(75 s) when the thin zone reaches the critical temperature is taken as the end point of temperature measurement, and the maximum temperature of each thick zone is 779.3 ℃. The maximum temperature difference is 135.1 ℃,showing a trend of increasing first and then decreasing. The maximum heating rate is 21.9 ℃/s, and then the heating rate of each region gradually decreases and the heating rate of each thick region changes when the heating process reaches 37 s. In order to provide a theoretical basis and effective method for the prediction of performance difference after heat treatment of the tailor rolled blank, the temperature distribution trend and internal law of the tailor rolled blank with time are analyzed.更多还原