F82H is the Japanese reference reduced-activation ferritic-martensitic (RAFM) steel for fusion blanket applications. The harsh environment of a fusion reactor, such as neutron irradiation and He/H damage, can result in significant degradation of F82H fracture toughness. Therefore, understanding the fracture toughness behavior of F82H in the fusion environment is critical to ensure the long-term safe operation of the fusion reactor. In this paper, we summarize seven irradiation campaigns of the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) covering five variants of F82H steels, including F82H IEA, F82H Mod3, F82H doped with 1.4% natural Ni, F82H doped with 1.4% ⁵⁸Ni, and F82H doped with 1.4% ⁶⁰Ni. The irradiation temperatures covered the range from 220 °C to 530 °C and the neutron irradiation dose spanned 4 dpa to 70 dpa. The effects of neutron irradiation temperature, dose, materials composition, Ni doping, and He production on F82H fracture toughness are discussed. Our results showed that irradiation embrittlement monotonically decreased with increasing irradiation temperature until 400 °C for F82H IEA and F82H Mod3. F82H Mod3 showed better fracture toughness than F82H IEA both before and after neutron irradiation. We determined that 1.4% Ni alloying can be applied to F82H for simulating He effect in a fission reactor without jeopardizing the fracture toughness of the material. However, more studies are needed to understand the effect of high dose (>20 dpa) and He production on F82H fracture toughness.

F82H是日本参考减活化铁素体-马氏体（RAFM）钢，用于融合毯。聚变反应堆的苛刻环境，例如中子辐照和He / H损坏，可能导致F82H断裂韧性显着降低。因此，了解F82H在聚变环境中的断裂韧性行为对于确保聚变反应堆的长期安全运行至关重要。在本文中，我们总结了橡树岭国家实验室（ORNL）的高通量同位素反应堆（HFIR）的七个辐照活动，涵盖了F82H钢的五个变体，包括F82H IEA，F82H Mod3，F82H掺杂1.4％天然镍，F82H掺杂含1.4％^58的镍和含1.4％^60的F82H你。辐照温度范围为220°C至530°C，中子辐照剂量范围为4 dpa至70 dpa。讨论了中子辐照温度，剂量，材料组成，Ni掺杂和He生成对F82H断裂韧性的影响。我们的结果表明，对于F82H IEA和F82H Mod3，辐照脆性随辐照温度的升高而单调降低，直到400°C。F82H Mod3在中子辐照前后均显示出比F82H IEA更好的断裂韧性。我们确定1.4％Ni合金化可应用于F82H，以模拟裂变反应堆中的He效应而不会损害材料的断裂韧性。然而，需要更多的研究来了解高剂量（> 20 dpa）和氦气生成对F82H断裂韧性的影响。