铁素体/马氏体（F/M）钢是第四代堆和聚变堆重要的候选结构材料之一。F/M钢的辐照硬化及脆化所呈现出来的特性是国际上的研究热点和难点。本研究拟采用位错动力学结合分子动力学、迈氏Monte Carlo方法，在课题组前期工作的基础上研究位错环、He泡及富Cr析出物的硬化机理，探明辐照是否会导致位错环富Cr、富Cr位错环对位错运动影响机理、He泡尺寸及温度对硬化的影响、富Cr析出物的硬化机理，分析位错环、He泡及富Cr析出物对F/M钢辐照硬化影响的协同作用机理，建立F/M钢辐照硬化物理模型，为F/M钢的抗辐照性能优化提供理论依据。

Since irradiation experiments of Ferritic/Martensitic (F/M) FeCr alloys show that F/M steels develop much less swelling than austenitic steels during neutron or charged particle irradiation，in addition, it is well-known that high Chromium contents of F/M alloys provide good resistance against corrosion, so they are considered as one of the most attractive candidate materials for future nuclear facilities, such as Fusion Reactor, ADS and Generation IV reactors.The mechanisms of irradiaiton hardening and embrittlement of F/M steels are not understood right now.This proposal will focus on the hardening effects of dislocation loops (enriched or not Cr), Helium bubble and Cr precipitates studied by dislocation dynamics, Molecular dynamics and Metropolis Monte Carlo methodes. The segregation mechanism of Cr to dislocation loop, the hardening mechanism of enriched dislocation loops, Helium bubbles and Cr precipitates will be studied indetail.Then, we will investigate the synergy in the hardening due to Cr precipitates, He bubbles and dislocation loops. At last, a physical model describes the hardening of F/M steels will be developed.