高强薄钢板喷淬过程传热系数的测定和分析

Determination and analysis of heat transfer coefficient of high-strength steel sheet during jet quenching

为了控制高强薄钢板喷水冷却过程的畸变,提高有限元模拟的精确度,设计了一套喷水淬火冷却试验装置,用于测量淬火时钢板温度随时间的变化曲线。使用DEFORM软件中的Inverse Heat Transfer反传热模块求解出高强薄钢板在喷水压力分别为0.05、0.1、0.2和0.3 MPa时钢板表面综合换热系数。试验结果表明,喷水冷却能提高水的对流换热,从而显著提高水在400℃以上高温段的冷却能力,对水在低温段的冷却能力没有明显提高。

An experimental device of spray quenching to measure the temperature curve of steel sheet changing with quenching time was designed in order to control the distortion of high strength steel sheet during spray cooling process and improve the accuracy of finite element simulation. The surface heat transfer coefficients of high strength steel sheet were calculated using the Inverse Heat Transfer module of the DEFORM software when the quenching pressure was 0.05 MPa, 0.1 MPa, 0.2 MPa, 0.3 MPa, respectively. The experimental results show that the water spray cooling can increase the convective heat transfer of water, and thus significantly improve the water cooling capacity in the high temperature period above 400 ℃, but not be suited to the low temperature period.