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首页> 外文会议>Applications of research reactors towards research on materials for nuclear fusion technology >EVALUATION OF MICROSTRUCTURAL STABILITY OF RAFM ODS-EUROFER STEEL
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EVALUATION OF MICROSTRUCTURAL STABILITY OF RAFM ODS-EUROFER STEEL

机译：RAFM ODS-EUROFER钢的微观结构稳定性评估

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Oxide dispersion strengthened ferritic-martensitic steels are candidates for applications in future fusion power plants. High creep resistance, good oxidation resistance, reduced neutron activation and microstructural long term stability at temperatures of about 650℃ are required in this scenario. Samples of reduced activation ferritic-martensitic 9%Cr ODS-EUROFER steel were cold rolled to 80% reduction in thickness and further annealed in vacuum at 800℃ at exposure times varying from 5 min up to 4320 h (6 months). These conditions were chosen to simulate accelerated service conditions with emphasis on the likely softening mechanisms responsible for changing microstructure and properties: recovery, recrystallization and Ostwald ripening of Y-based particles. Nevertheless, these experimental conditions are far from those expected during service life in fusion reactors where a unique combination of high energy, high intensity fast neutron fluxes and high temperatures is present. The preliminary microstructural characterization of annealed samples was performed using scanning electron microscopy and Vickers microhardness testing. Further testing of deformed samples under neutron irradiation is a necessary step to understand how defects created by neutron irradiation interact with already existing dislocations and interfaces in the deformed material.
机译：氧化物弥散强化的铁素体-马氏体钢是未来聚变电站中应用的候选材料。在这种情况下，要求具有较高的抗蠕变性，良好的抗氧化性，降低的中子活化作用以及在约650℃的温度下的微观结构长期稳定性。将还原活化的铁素体-马氏体9％Cr ODS-EUROFER钢样品冷轧至厚度减小80％，然后在800℃的真空下进一步退火，暴露时间从5分钟到4320小时（6个月）不等。选择这些条件是为了模拟加速的服务条件，重点是负责改变微观结构和性质的可能的软化机制：Y基颗粒的恢复，重结晶和奥斯特瓦尔德熟化。然而，这些实验条件与聚变反应堆使用寿命期间的预期条件相去甚远，在聚变反应堆中，存在着高能量，高强度快速中子通量和高温的独特结合。使用扫描电子显微镜和维氏显微硬度测试对退火后的样品进行初步的微观结构表征。在中子辐照下对变形样品进行进一步测试是了解中子辐照产生的缺陷如何与变形材料中已经存在的位错和界面相互作用的必要步骤。

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