Abstract Combining the hot stamping process and a Quench and Partition (Q&P) heat treatment can improve the mechanical properties of hot stamped automotive parts. This paper investigates using a new heating device to heat or cool a part to a given temperature. Instead of performing the partitioning heat treatment in a furnace, this work proposes using a new hot air process that performs the partitioning treatment. The new device obtains a fast heating rate and a uniform temperature distribution, necessary for Q&P. The effect of partitioning time and temperature on the mechanical properties of parts were analyzed by the new processing method, which is suitable for use in the area of industrial hot stamping. The results show that the hot air partitioning device provides more control over the partitioning temperature because convection is more efficient than radiation. Control over the quench temperature and partition is critical for the Q&P process to enable the carbon diffusion to stabilize the austenite. Furthermore, the highest product of strength and elongation (1380 MPa × 13%) using the hot air process under the authors’ set-up condition is obtained when the partitioning time is 60 s and the temperature is 425 °C, thanks to the optimum ratio between martensite and austenite, which was observed through scanning electron microscopy.

中文翻译：

---

结合热冲压和 Q&P 加工与热风分区装置

摘要 将热冲压工艺与淬火分区（Q&P）热处理相结合可以提高热冲压汽车零部件的机械性能。本文研究了使用新的加热装置将零件加热或冷却到给定温度。这项工作建议使用一种新的热风工艺来执行分配处理，而不是在炉中进行分区热处理。新设备获得快速加热速度和均匀的温度分布，这是 Q&P 所必需的。采用新的加工方法分析了分区时间和温度对零件力学性能的影响，适用于工业热冲压领域。结果表明，由于对流比辐射更有效，因此热空气分隔装置可以更好地控制分隔温度。控制淬火温度和分配对于 Q&P 过程至关重要，以便使碳扩散稳定奥氏体。此外，当分配时间为 60 s 和温度为 425 °C 时，在作者设置的条件下使用热风工艺获得了最高的强度和伸长率乘积（1380 MPa × 13%），这要归功于最优马氏体与奥氏体的比例，通过扫描电子显微镜观察。