一种Si-Mn系超高强度钢板的热冲压成形试验研究

 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。

Hot Stamping Processing Experiments of a New Si-Mn Type Ultrahigh Strength Steel Sheet

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 processing parameters,acceptable quench hardening of hat-shaped parts of used Si-Mn type steel sheet can be obtained.Therefore,the resulted nearly fully fine martensitic 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 22MnB5.After hot stamping,the tensile strength of the Si-Mn type steel sheet could be improved to 300% of the original one.