Abstract High ductility after quenching has significant benefits for ultra-high strength steels, especially from the perspective of formability. Intercritical annealing was applied prior to rapid quenching (flash) to obtain heterogeneous phase (HP) units, consisting of nano-twinned martensite and retained austenite. The uniform elongation was significantly enhanced without compromising ultimate tensile strength because of nanoscale twinned martensite and retained austenite. The formation of nanoscale twinned martensite and retained austenite occurred because of micro-segregation of alloying elements (Mn and Al) by combining annealing and flash process. Thermodynamic calculations enabled us to design the alloy and heat treatment.

中文翻译：

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精制异相单元提高淬火超高强度钢的延展性

摘要 淬火后的高延展性对超高强度钢具有显着的好处，特别是从成形性的角度来看。在快速淬火（闪蒸）之前应用临界间退火以获得由纳米孪晶马氏体和残余奥氏体组成的异相 (HP) 单元。由于纳米级孪晶马氏体和残余奥氏体，在不影响极限抗拉强度的情况下显着提高了均匀伸长率。纳米级孪晶马氏体和残余奥氏体的形成是由于合金元素（Mn 和 Al）通过结合退火和闪蒸工艺的微观偏析而发生的。热力学计算使我们能够设计合金和热处理。