利用散裂中子源模拟聚变环境辐照F82H铁素铁/马氏体钢, 辐照温度为150-450 ℃, 辐照剂量为6.1-20.2 dpa. 对不同温度和剂量辐照后样品的微观结构进行了TEM观察, 结果表明, 当辐照温度高于208 ℃, 辐照剂量高于9.5 dpa, He浓度高达680×10-6时的样品中存在尺寸约为1.6 nm的高密度 He泡. 分析了辐照剂量、温度以及嬗变He浓度对F82H钢微观结构的影响.
Low active ferritic/martensitic steel, F82H, has been developed as a candidate material for structural applications of fusion reactors because it has relatively low shifts in ductile-to-brittle transition temperature (DBTT) and excellent irradiation swell resistance. More works have been done in recent years on the microstructure and mechanical properties of F82H steel before and after irradiation, but most of the tested samples were irradiated at low temperature (<400 ℃). In this work, the microstructure of F82H steel irradiated in the Swiss spallation neutron source SINQ in a temperature range of 150-450 ℃ and a dose range of 6.1-20.2 dpa was studied. Defect clusters and He bubble were observed by TEM in the irradiated specimens. The results showed that there existed high density He bubbles with size of 1.6 nm under irradiation temperature higher than 208℃, irradiation dose higher than 9.5 dpa and He concentration 680×10-6. The effects of irradiation dose, irradiation temperature and He concentration on microstructure of F82H steel were discussed.
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