通过对比通有保护气、无保护气、仿工业化热冲压的热冲压件的性能,研究了热冲压过程中冷速对硼钢22MnB5组织性能的影响规律.结果表明,在三种工艺条件下实验件的冷却速度均大于马氏转变的临界冷却速度,组织均为板条状马氏体,抗拉强度在1500MPa以上.冲压模具的温度升高,板料表面存在氧化皮,都会使板料的冷却速度减小,马氏体片层变粗,性能下降.通过降低模具温度,增加板料加热时的起保护,可使得板料冷速增加,马氏体组织细小,获得强度为1600MPa以上,强塑积接近20,000 MPa·％的热冲压硼钢件.
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