低活化铁素体/马氏体（RAFM）钢是聚变反应堆的首选抗辐照结构材料，高能14MeV聚变中子辐照将在材料内部引起辐照缺陷及氢氦嬗变元素，使材料力学性能退化，服役寿命降低和风险增加，辐照损伤研究成为RAFM钢研究热点。影响聚变中子辐照损伤因素复杂，国际上做了大量研究并分析了辐照损伤一些规律，但材料辐照损伤机理尤其是辐照后氦效应的研究不够深入，氦与辐照缺陷相互作用机制尚不明确，因此，低活化钢的辐照后氦效应及抗辐照微结构分析是辐照损伤机理研究的热点及难点。本项目拟对中国低活化马氏体（CLAM）钢等低活化钢，通过测试辐照前后的力学性能和微观结构，分析中子辐照后氦影响的剂量效应、温度效应和微结构对氦效应影响机制，同时结合分子动力学模拟研究，可为提高CLAM钢抗辐照性能及优化制备工艺提供实验依据和理论指导。本研究对聚变堆结构材料的早期应用和长期服役具有重要意义。

Reduced Activation Ferritic/Martensitic steels (RAFMs) are presently considered as the primary candidate structure material for future fusion reactors. The structure materials will undergo high displacement damage and transmutation helium by intense flux of high energy neutrons. So irradiation experiments on candidate structure material were widely carried out to investigate the irradiation effects. Many factors affect the fusion neutron irradiation damage and it's difficult to get the anti-irradiation damage mechanisms of material microstructure. In this study, heliumn effects on China Low Activation Martensitic (CLAM)steel will be investigated using fission reactor and spallation neutron source. In order to improve the irradiation properties of RAFM steel and get the influencing factors, microstructure examine before and after irradiation will be done to analysis the irradiation-induced changes in mechanical properties and microstructure. To investigate the mechanism of irradiation damage and microstructure on mechanical properties, simulation will be done using molecular dynamics tools. This study will make a significant cotribution to development of CLAM steel and is very important for application of fusion structure materials.