中文摘要：

通过显微硬度测试、单向拉伸试验、显微组织和断口形貌观察,研究了加热温度（870、900、930、960℃）和模具温度（100、200、300、400℃）对热冲压用超高强度硼钢B1500HS微观组织和力学性能的影响。结果表明：900℃及以上加热温度试样发生完全奥氏体转变,但对于板材的力学性能影响不明显;模具温度对于热冲压零件微观组织、力学性能等方面的影响较大,模具温度升高到300℃时,试样在此温度下发生奥氏体的反稳定化,导致强硬度明显升高;通过控制模具各位置的温度,可以获得具有较大力学性能梯度的热冲压零件,改善热冲压零件的综合力学性能。

英文摘要：

Effects of heating temperature（ 870,900,930,960 ℃） and mold temperature（ 100,200,300,400 ℃） on the mechanical properties and microstructure of hot stamping B1500HS boron steel plates were investigated by means of the uniaxial tensile experiment,the microstructure,fractography observation and micro-hardness tests. The results show that when the heating temperature is 900 ℃ or above,B1500HS steel can be fully austenitized. Nevertheless,variation of austenitization temperature at 900-960 ℃ has no obvious effect on the mechanical properties. The mold temperature has a significant influence on the microstructure and mechanical properties of the hot stamped samples. The anti-stability of austenization occurs at the mold temperature of 300 ℃ which results in a drastically rise in the hardness and toughness of samples. The structural components with gradient properties can be manufactured by controlling the austenization temperature and mold temperature.