Abstract A new 0.25C2Cr10Ni8Co2Mo2Al steel was designed and fabricated by vacuum induction melting, forging and heat treatments. Excellent mechanical properties with a combination of a 2.4 GPa ultimate tensile strength, a 2.1 GPa yield strength, a 11.4% total elongation and a 37 J/cm2 V-notch impact toughness were obtained. Such a combination of strength–ductility–toughness of the present steel is much superior than any reported conventional ultrahigh strength steel. The excellent mechanical properties of the steel can be well interpreted by synergistic strengthening of high-density dislocations, strong segregations of C, Mo and Cr on dislocations and massive nanosized NiAl precipitations.

中文翻译：

---

纳米粒子与高密度位错协同强化设计的新型2.4GPa超高强钢，具有良好的延展性和高韧性

摘要 采用真空感应熔炼、锻造和热处理工艺设计制造了一种新型0.25C2Cr10Ni8Co2Mo2Al钢。获得了具有 2.4 GPa 极限拉伸强度、2.1 GPa 屈服强度、11.4% 总伸长率和 37 J/cm2 V 型缺口冲击韧性的优异机械性能。本钢的这种强度-延展性-韧性的组合比任何报道的常规超高强度钢都要优越得多。通过高密度位错的协同强化、位错上的 C、Mo 和 Cr 的强烈偏析以及大量纳米尺寸的 NiAl 析出，可以很好地解释该钢的优异机械性能。