Effects of different process parameters on mechanical properties and microstructures of hot stamping boron steel
Effects of different process parameters on mechanical properties and microstructures of hot stamping boron steel
复制标题
不同工艺参数对热冲压硼钢力学性能和显微组织的影响
DOI：
10.1007/s00170-021-06736-w
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发表时间：
2021-03-24
影响因子：
3.4
通讯作者：
Liu, Bo
中科院分区：
文献类型：
--
作者：
Chen, Wei;Zhu, Yitao;Liu, Bo
热冲压工艺已越来越多地用于生产具有超高强度性能的汽车零部件。这样可以在提高新一代汽车耐撞性的同时减轻车身重量。本文以B1500 HS硼钢板为研究对象，建立了一套能够真实的实时监测板料和模具温度的热冲压实验装置。在连续热冲压的条件下，考察了模具温度达到动态稳定时，热冲压过程中的初始成形温度、接触压力和保压时间。以冲压坯的显微组织和力学性能（抗拉强度、延伸率和硬度）作为质量评价指标。对于厚度为1.2 mm的B1500 HS硼钢板，热冲压成形的最佳工艺参数组合为：初始成形温度为800 °C，接触压力为20 MPa，保压时间为10 s。在抗拉强度为1495 MPa，延伸率为7%，硬度为510 HV的条件下，最终可获得马氏体相致密的高质量热冲压件。
Hot stamping process has been increasingly used to produce automotive parts with ultra-high-strength property. Thus, increasing the crashworthiness of new generation vehicles and reducing car body weight could be simultaneously obtained. Taking boron steel B1500HS as the research object, this paper built a set of hot stamping experiment equipment that could monitor the temperature of sheet metal and die in real time. The initial forming temperature, contacting pressure, and pressure holding time in hot stamping process were examined under the condition of continuous hot stamping when the die temperature got into dynamic stability. The microstructures and mechanical properties including tensile strength, elongation, and hardness of stamped blank were used as quality evaluation indexes. For B1500HS boron steel sheets with the thickness of 1.2 mm, the optimal process parameter combination of hot stamping process comes true when the initial forming temperature is 800 °C, the contacting pressure is 20 MPa, and the pressure holding time is 10 s. The high-quality hot stamping parts with compact martensite phase could be finally obtained at the tensile strength of 1495 MPa, elongation of 7%, and hardness of 510 HV.