The contribution of ENEA together with Rina-CSM to the Eurofusion programme “WPMAT-Advanced Seels” deals with the development of innovative RAFM steels able to withstand the critical temperatures typical of the different operational environments foreseen for the blanket of the first DEMO reactor. The optimization of the chemical composition and the Thermo Mechanical Treatment for these materials should be done according to the blanket operating temperatures that are related to two possible working conditions: the WCLL-BB (Water Cooled Lead Lithium Breeding Blanket) or the H(D)CLL-BB (Helium (Dual) Cooled Lead Lithium Breeding Blanket). On the one hand the “water-cooling” option implies a minimum irradiation temperature for the blanket material in the range of 280–350 °C. On the other hand, the “helium-cooled” and the “dual-coolant” solutions imply an operating temperature for the blanket material in the range of 650 °C. Therefore in the first case the target is the improvement of the toughness of the martensitic alloys; whilst concerning the second scenario the target is the development of more creep resistant martensitic steels, suitable to tolerate such a high operating temperature. In both the cases the Tungsten content plays a key role, both in terms of solid solution hardening and influence on the DBTT. Two alloys aimed at fulfilling the specifications for the two DEMO operating conditions, both with increased Tungsten content respect to Eurofer, have been produced and characterized. The mechanical properties of these two alloys are hereby reported and discussed.

ENEA与Rina-CSM一起为Eurofusion计划“ WPMAT-Advanced Seels”所做的贡献涉及创新型RAFM钢的开发，该钢能够承受第一个DEMO反应堆橡皮布所预期的不同运行环境的典型临界温度。这些材料的化学成分和热机械处理的最优化应根据与两种可能的工作条件有关的毯子工作温度进行：WCLL-BB（水冷铅锂育种毯）或H（D） CLL-BB（氦气（双）冷却铅锂繁殖毯）。一方面，“水冷”选项意味着毯子材料的最低照射温度在280–350°C的范围内。另一方面，“氦冷却”和“双冷却剂”解决方案意味着毯子材料的工作温度为650°C。因此，在第一种情况下，目标是提高马氏体合金的韧性。在涉及第二种情况时，目标是开发更耐蠕变的马氏体钢，以适应如此高的工作温度。在这两种情况下，无论是固溶硬化还是对DBTT的影响，钨含量都起着关键作用。已经生产并表征了两种合金，它们旨在满足两种DEMO操作条件的规格，并且相对于Eurofer而言，钨含量都增加了。据此报道和讨论了这两种合金的机械性能。