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以Q235B带钢层流冷却过程为研究对象,建立了冷却过程的数学模型。通过FLUENT仿真得到了带钢表面不同位置的对流换热系数。采用ANSYS和MATLAB软件对带钢冷却过程中的温度变化、相变和应力分布进行了仿真。结果表明:水冷过程中,带钢上下表面的温度变化成锯齿状,中心温度基本是线性降低;冷却结束后,主要成分为铁素体,上表面的铁素体含量为93.2wt%;在水冷阶段,带钢应力急剧增加且呈锯齿状,在空冷阶段应力下降,冷却结束后,上下表面和中心的应力基本相等;后段主冷模式与前段主冷模式相比,Q235B带钢上下表面和中心位置的平均应力分别降低了47.6%、29.4%、11.2%。
Taking the cooling process of laminar flow in Q235B strip as the research object, a mathematical model of cooling process was established. The convective heat transfer coefficient of different locations on the strip surface was obtained by FLUENT simulation. The temperature changes, phase transitions and stress distributions in the strip cooling process were simulated by ANSYS and MATLAB software. The results show that during the cooling process, the temperature on the upper and lower surfaces of the strip changed into jagged and the center temperature decreased linearly. After the cooling, the main component was ferrite and the ferrite content on the upper surface was 93.2wt% Stage, the strip stress increases sharply and jagged, the stress decreases in the air-cooling stage, after cooling, the stress on the upper and lower surfaces and the center are basically the same; the main cooling mode of the rear section is compared with the main cooling mode in the previous section, The average stress at the center decreased by 47.6%, 29.4% and 11.2% respectively.