热轧中厚板超快速冷却过程温度场数值模拟  

Numerical simulation of temperature field in ultra-fast cooling process of hot rolled plate

作　　者：孙明翰 郑义 曲春涛 金世哲 许志强 杜凤山 SUN Ming-han;ZHENG Yi;QU Chun-tao;JIN Shi-zhe;XU Zhi-qiang;DU Feng-shan(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《钢铁》2020年第3期50-57,共8页Iron and Steel

基　　金：国家自然科学基金重点资助项目(U1560206)。

摘　　要：超快速冷却工艺作为热轧钢板生产的核心技术,对改善板材产品组织形态、提升产品性能具有重要意义。在中厚钢板的超快速冷却过程中,心部与表面之间的冷却速度差异使得钢板在厚度方向上形成内外温度差,而超快速冷却中钢板表面的换热机制较为复杂,两者综合提升了中厚板冷却机制的界定难度。为提升中厚板超快冷模型计算精度,完善其换热体系,建立了中厚钢板轧后超快速冷却过程中等效换热系数反求法的数学模型。该模型依托离散解析法,基于导热微分方程及物体正规阶段的状态特点,将求得的超越方程根转化为等效换热系数,并将此作为超快冷温度场模型的边界条件。在此基础上,构建了超快速冷却温度场仿真模型,验证了20mm钢板超快速冷却机制下的温度场。结果表明,等效换热系数反求法的数学模型能够适用于中厚钢板的超快冷工艺。The ultra-rapid cooling process is the core technology for the production of hot-rolled steel sheets,which is of great significance for improving the structure of the plate products and improving the performance of the products.In the ultra-rapid cooling process of medium-thick steel plates,the difference in cooling speed between the core and the surface causes the steel plate to form an internal and external temperature difference in the thickness direction,but the heat transfer mechanism of the steel plate surface in the ultra-rapid cooling is complicated.Therefore,all of them increase the difficulty of defining the cooling mechanism of the plate.In order to improve the calculation accuracy of the ultra-fast cooling model of medium and heavy plates and improve its heat exchange system,this article establishes a mathematical model for the inverse method of equivalent heat transfer coefficient in the ultra-rapid cooling process of medium-thick steel plates after rolling.The model relies on the discrete analytical method,the thermal differential equation and the state characteristics of the normal phase of the object.The model transforms the obtained transcendental equation root into the equivalent heat transfer coefficient,and the result is used as the boundary condition of the ultra-fast cold temperature field model.On this basis,a super-fast cooling temperature field simulation model was constructed to verify the temperature field under the ultra-fast cooling mechanism of 20 mm steel plates.The results showed that the mathematical model of the inverse heat transfer coefficient inverse method could be applied to the ultra-fast cooling process of medium-thick steel plates.

关 键 词：热轧钢板 超快速冷却 等效换热系数 反求法 

分 类 号：TG335.11[金属学及工艺—金属压力加工]