超高强度热成形钢研究进展及展望

Research progress and prospect of ultra-high strength hot-formed steel

在“双碳”战略的大背景下,环保、节能等问题越来越受到重视,由此对汽车用钢轻量化提出了更高的要求,超高强热成形钢作为汽车用钢的重要组成部分,有着广阔的研究前景。概述了国内外热成形钢研究现状,从成分设计、组织特征、工艺调控等多个角度出发,总结出了微合金化和残余奥氏体组织调控对超高强热成形钢强塑化机制的影响规律;阐述了铝硅镀层、锌基镀层热成形钢及新型无镀层高抗氧化性热成形钢的研究进展;论述了超高强热成形钢微观组织与氢致延迟开裂行为之间的相互作用。对超高强热成形钢的进一步优化控制提出了建议,为实现高强塑性及优异服役性能的超高强热成形钢的研发与产业化应用提供了参考。

Under the background of the"double carbon"strategy,environmental protection,energy saving,and other issues have been valued,which put forward higher light weight requirements for automotive steel.As an essential part of automotive steel,ultra-high strength hot-formed steel has broad research prospects.The research status of hot-formed steel at home and abroad is summarized,and the influence of microalloying and residual austenitic structure control on the robust plasticizing mechanism of ultra-high strength hot-formed steel is also summarized from composition design,microstructure characteristics and process control.The research progress of aluminum-silicon coated and zinc-based coated hot-formed steels and new non-coated hot-formed steels with high oxidation resistance is described.The interaction between microstructure and hydrogen-induced delayed cracking behavior of ultra-high strength hot-formed steel is discussed.At the same time,suggestions for further optimization control of ultra-high strength hot-formed steel are put forward,providing a reference for developing and industrial application of ultra-high strength hot-formed steel with high strength plasticity and excellent service performance.