针对传统强化方式（弥散强化、固溶强化和加工硬化等）往往以牺牲塑韧性为代价来提高金属材料强度的缺点，本项目综合纳米有序析出相和纳米孪晶增强，多层复合界面和共格界面增韧的设计理念，选择具有低屈服强度和屈强比、超高塑性的TWIP钢和具有超高屈服强度、屈强比的马氏体时效钢，以材料计算学及热力学为基础进行成分、结构设计，并利用真空热轧和累积叠轧方式制备Maraging/TWIP纳米多层复合钢，阐明不同轧制和热处理条件下显微组织、界面结构、纳米孪晶和共格有序纳米析出相的形成规律以及对力学性能的影响规律，揭示系列多层复合钢的裂纹萌生、扩展路径和断裂机理，从而实现层状界面、共格有序相和纳米孪晶的协同强韧化目标。

For the conventional strengthening technology (such as solution strengthening, precipitation strengthening and work hardening), the disadvantage is that the plasticity and toughness of metal materials decrease with the increasing strength. Base on the design concept of strengthening by nano scale ordered phase and nano twins and toughening by multi-layer interface and coherent interface, TWIP steel with low yield strength, yield ratio and ultra high plasticity and maraging steel with high yield strength, yield ratio will be adopted in this study. The Maraging/TWIP nano multi-layer composite steel will design by computational materials science and thermodynamics, and then prepare by vacuum hot rolling and accumulative roll bonding technology. The effect of different process parameters on microstructure, interface structure, nano twins, coherent ordered nano precipitates and mechanical properties will be studied. The crack initiation, crack propagation path and fracture mechanism of multi-layer composite steel will be discussed, the purpose of which is to achieve the synergistic effect of strengthening and toughening by layer interface, coherent ordered phase and nano twins.