Ultrahigh-strength steel BR1500HS was chosen as the research object. The parameters of insert hot stamping die’s cooling system in the synchronous quenching process were calculated, and the cooling system was designed based on the temperature distribution of formed part. Then, by combining FEM simulation and thermal-mechanical coupling theory of synchronous quenching process of hot stamping, the cooling system was optimized. After that, the punch and die were optimally designed based on the simulation of temperature field of formed part as well as dies, and their temperature decreased by 15°C and 12°C, respectively. Next, the microstructural evolution in austenization and synchronous quenching processes was analyzed. By adopting a synchronous cooling system in hot stamping, by optimizing the parameters and control strategies, and by controlling the water velocity in various inserts, the homogeneity of martensitic phase transitions was improved. The results of the application test show that martensitic phase transitions of major parts are uniform under given working conditions, and hardness difference of each part was small.

中文翻译：

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插入式热冲压模具冷却系统的优化设计和同步淬火过程中马氏体相变的组织均匀性控制研究

选择了超高强度钢BR1500HS作为研究对象。计算了同步淬火过程中嵌件热冲压模具的冷却系统参数，并根据成型件的温度分布设计了冷却系统。然后，结合有限元模拟和热冲压同步淬火过程的热力耦合理论，对冷却系统进行了优化。此后，根据成形零件和模具的温度场模拟对冲头和模具进行了优化设计，它们的温度分别降低了15°C和12°C。接下来，分析了奥氏体化和同步淬火过程中的组织演变。在热冲压中采用同步冷却系统，通过优化参数和控制策略，通过控制不同插入物中的水速，改善了马氏体相变的均匀性。应用试验的结果表明，在给定的工作条件下，主要零件的马氏体相变是均匀的，并且每个零件的硬度差很小。