高强度钢板热成形界面换热系数估算

Estimation of interface heat transfer coefficient of ultra high strength steels in hot forming

为评估高强度钢板热冲压成形过程中的传热强度,本文根据实验采集的温度曲线,利用热平衡的数值积分形式得到了不同压强下随温度连续变化的换热系数,求解过程中通过等效热容的方式引入了马氏体相变的影响。结果表明,换热系数的大小不仅与压强相关,而且随着材料温度变化。最后求得的换热系数被带入Abaqus仿真计算,仿真结果能和实验数据较好的吻合,从而对实验及估算方法的有效性进行了验证。

To evaluate the interface heat transfer intensity during hot stamping process of ultra high strength steel,the numerical integration form of heat balance equation was proposed to calculate the IHTC in this study on the basis of experiment measured temperature curves,and the martensitic phase transformation was taken into consideration by means of equivalent heat capacity in the process of solving.The results show that the IHTC not only depend on working pressure,but also depend on temperature of materials.Finally,effectiveness of applied experimental and estimation method is verified by bringing the calculated IHTC into FEM software,and simulation results are in good agreement with experimental data.