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Prediction of Hardness for Partially Quenched Boron Steel Using Quench Factor Analysis

机译：用淬火因子分析预测部分淬火硼钢的硬度

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The mechanical properties of hot stamped boron steel have been generally predicted by many empirical models based on the Kirkaldy's equation. Although predicting previous models are well-developed for prediction of mechanical properties, use of those models is still limitary in case of partial quenching process for tailored properties of component. Therefore, this study predicted the mechanical property of partially quenched boron steel by heated tools using the FE-simulation coupled with quench factor analysis (QFA). The dilatometry test of boron steel is performed at various ranges of cooling rates from 0.5 to 70℃ /s of which results are used to determine the material constants (K_(1)~K_(8)) of QFA and the time-temperature-property (TTP) diagram of boron steel. And then, FE-simulation of partial quenching is carried out to obtain the cooling curves according to heating temperatures of tool. The extracted results from FE-simulation are combined with the QFA to calculate the hardness distribution of partially quenched parts. Finally, experiment of partial quenching is performed to verify the predicted results and to examine the effect of tool temperatures on the hardness of formed part. The predicted hardnesses of U-channel parts are in good agreement with the measured ones within a maximum error of 7.4%.
机译：基于柯克迪方程的许多经验模型通常可以预测出热冲压硼钢的力学性能。尽管预测先​​前的模型对于预测机械性能已经得到了很好的发展，但是在针对组件的定制性能进行部分淬火的过程中，使用这些模型仍然是有限的。因此，本研究使用有限元模拟和淬火因子分析（QFA），通过加热工具预测了部分淬火硼钢的力学性能。在0.5至70℃/ s的各种冷却速率下进行硼钢的膨胀试验，其结果用于确定QFA的材料常数（K_（1）〜K_（8））和时间-温度。的性能（TTP）图。然后，进行局部淬火的有限元模拟，以根据工具的加热温度获得冷却曲线。从有限元模拟中提取的结果与QFA相结合，以计算部分淬火零件的硬度分布。最后，进行部分淬火实验以验证预测结果并检查工具温度对成型零件硬度的影响。 U形通道部件的预测硬度与实测硬度非常吻合，最大误差为7.4％。

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