采用弯曲件热冲压成形试验研究了板料加热温度、保温时间及移送时间等工艺参数对一种Si—Mn系超高强度钢板热成形零件的力学性能及微观组织的影响规律。结果表明。通过控制热成形工艺参数，在所设计的模具上可实现Si—Mn系超高强度钢板热成形零件的有效淬火，在合适的工艺参数下，可获得细小均匀的马氏体组织，从而获得抗拉强度1700MPa以上，伸长率10％以上的性能，达到原始板料抗拉强度的3倍左右，并明显高于传统的Mn—B系超高强度钢板。
The influence of hot stamping processing parameters such as blank heating temperature, soaking time and transferring time on the mechanical properties and microstructures of the hot stamped parts of a new Si-Mn type ultrahigh strength steel sheet was analyzed. The hot stamping processing experiments were conducted by using a designed hat-shaped bending die, The results show that through suitable controlling of these hot stamping process ing parameters, acceptable quench hardening of hat-shaped parts of used Si-Mn type steel sheet can be obtained. Therefore, the resulted nearly fully fine martensitie microstructure provides tensile strength over 1 700 MPa and elongation over 10%, which is much higher than that of the currently widely used hot stamping boron steel 22MnBS. After hot stamping, the tensile strength of the Si-Mn type steel sheet could be improved to 300% of the original one.
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