汪贺模
,
蔡庆伍
,
余伟
,
苏岚
材料科学与工艺
为了确定加速冷却或直接淬火时实现预期的冷却速率所需的对流换热系数,利用MSC.MARC有限元分析软件对Q345B中厚钢板冷却过程中温度场进行了数值模拟计算.确定了实现直接淬火条件下不同厚度（〉20 mm）钢板的理论极限冷却速率所需的对流换热系数为15 000 W/（m2·℃）,并分析了冷却速率与对流换热系数、钢板厚度之间关系.研究表明,对于同一厚度、材质中厚钢板,其冷却速率随对流换热系数的增加而增大.超快速冷却或直接淬火时,带钢冷却速率随对流换热系数增加而显著增加;对流换热系数大于15 000 W/（m2·℃）时,厚度（〉30 mm）钢板的冷却速率基本不变,达到其物理极限冷却速率;换热系数增加,厚度方向上温度梯度增加.
关键词:
中厚板
,
对流换热系数
,
直接淬火
,
冷却速率
,
温度场
M.Y. Gu
,
G. Chen
,
M.C. Zhang
,
X.C. Dai
金属学报(英文版)
The mathematical model has been established for the simulation of steel coil's heat transfer during annealing thermal process in HPH (high performance hydrogen) furnace. The equivalent radial thermal conductivity is adopted by statistical analysis regression approach through the combination of a large quantity of production data collected in practice and theoretical analyses. The effect of the number of coils on circulating flow gas is considered for calculating the convection heat transfer coefficient. The temperature within the coil is predicted with the developed model during the anneling cycle including heating process and cooling process. The good consistency between the predicted results and the experimental data has demonstrated that the mathematical model established and the parameters identified by this paper are scientifically feasible and the effective method of calculation for coil equivalent radial heat transfer coefficient and circulating gas folw has been identified successfully, which largely enhances the operability and feasibility of the mathematic model. This model provides a theoretical basis and an effective means to conduct studies on the impact that foresaid factors may imposed on the steel coil＇s temperature field, to analyze the stress within coils, to realize online control and optimal production and to increase facility output by increasing heating an cooling tates of coils without producing higher thermal stress.
关键词:
HPH furnace
,
null
,
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