Study on cooling capacity of steel plate during accelerated cooling and direct quenching

作者：Wang, He-Mu; Cai, Qing-Wu^*; Yu, Wei; Su, Lan

来源：Materials Science and Technology, 2012, 20(2): 12-15.

• Accelerated cooling
• Cooling Capacity
• Cooling process
• Cooling rates
• Direct-quenching
• Steel plates
• Theoretical limits
• Thickness direction

To confirm the heat transfer coefficient corresponding to cooling rates during accelerated cooling or direct quenching, the temperature field of Q345B steel plate during cooling process was simulated by MSC. MARC. When the plate thicknesses >20 mm, the heat transfer coefficient is 15000 W/(m2·°C), which realizes the theoretical limit cooling rate. The relationship of cooling rate, plate thickness and convection heat transfer coefficient was also analyzed. The results show that the cooling rate of the steel plate increases with the increasing of convection heat transfer coefficient for the same plate thickness. For a 3~6 mm steel strip, the cooling rate increases drastically faster with the increasing of convection heat transfer coefficient during accelerated cooling or direct quenching. Beyond the convection heat transfer coefficient of 15000 W/(m2·°C), the cooling rate of the steel plates (>30 mm) changes slightly, which substantially equals to the physical limit cooling rate. With the increasing of convection heat transfer coefficient, the temperature gradient along the thickness direction is increased.

• 出版日期2012-4
• 单位北京科技大学