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应用有限元方法模拟分析了控制冷却过程钢板厚度方向上温度和冷却速度的分布。结果表明,钢板表面冷却速度随着冷却的进行逐渐减小,而钢板中心冷却速度逐渐增大,其余位置的冷却速度先增大然后减小。分析了冷却时间、开始冷却温度、冷却水温度和水流密度对冷却速度和钢板表面与中心冷却速度差的影响规律,结果表明,冷却速度差随冷却时间的增加、开始冷却温度的升高和冷却水温度的升高而减小,随水流密度的增大而增大。试验结果表明,由于冷却速度不同,钢板厚度方向上的组织和晶粒尺寸不同,钢板表面出现了贝氏体组织,板厚度1/4处和中心为铁素体和珠光体,晶粒尺寸从表面向中心逐渐增大。
The finite element method was used to simulate and analyze the distribution of temperature and cooling rate in the process of controlling the cooling process. The results show that the cooling rate on the steel surface decreases with the progress of cooling, while the cooling rate increases gradually at the center of the steel plate. The cooling rate of the other positions first increases and then decreases. The effects of cooling time, initial cooling temperature, cooling water temperature and water current density on the cooling rate and the difference between the steel plate surface and the center cooling rate were analyzed. The results show that the cooling rate difference started to increase and cooled with the increase of the cooling time Water temperature increases and decreases, with the increase of water flow density. The experimental results show that due to the different cooling rate, the thickness direction of the steel plate and the grain size of different sizes, the surface of bainitic steel plate appears at the plate thickness of 1/4 and the center of ferrite and pearlite, grain size from The surface gradually increased toward the center.