现代汽车制造中越来越多地应用硼钢板热冲压技术来减轻车身重量并提高碰撞安全性，淬火时间对该过程中板料热力学行为和组织转变有重要作用。以汽车热冲压件的典型特征结构———U 形梁为对象，将马氏体相变动力学模型嵌入硼钢板热冲压全过程热力耦合三维有限元模型中，实现了对该过程中板料热力学行为和马氏体相变的有效预测，预测结果与实验结果吻合良好。揭示了淬火时间对硼钢板热冲压的影响，结果表明，随淬火时间的延长，板料温度和温降速率均降低，温度分布越均匀；马氏体转化率增加，分布趋于均匀，但淬火时间超过22 s后，马氏体转化率的大小和分布不再发生变化；最大回弹值减小。
Hot forming of boron steel sheet (BSS)is increasingly used to reduce weight and improve crash safety of automobile in automobile body manufacturing.Quenching time plays an important role on thermo-mechanical behaviors and structural transformation of sheet in the process.Taking the feature structure of automobile hot stamped parts—U-shaped part as the obj ect,martensite transformation kinetics model was implemented into the coupled thermo-mechanical 3D-FE model of the whole process of hot forming of BSS,so the thermo-me-chanical behaviors and martensite transformation of sheet can be effectively predicted,with the predictive and experimental results being in good agreement.Effects of quenching time on hot forming of BSS are revealed and the results obtained show that as the quenching time increases,both temperature and temperature reducing ve-locity decrease,and the temperature distribution becomes more uniform;martensite transformation rate increa-ses and its distribution tends to be more uniform,but when the quenching time was greater than 22 s,martens-ite transformation rate does not change any more;the peak value of springback decreases.
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