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Recent Developments in Irradiation-Resistant Steels

机译:耐辐照钢的最新发展

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Advanced fission and future fusion energy will require new high-performance structural alloys with outstanding properties that are sustained under long-term service in ultrasevere environments, including neutron damage producing up to 200 atomic displacements per atom and, for fusion, 2000 appm of He. Following a brief description of irradiation damage and damage resistance, we focus on an emerging class of nanostructured fer-ritic alloys (NFAs) that show promise for meeting these challenges. NFAs contain an ultrahigh density of Y-Ti-O-enriched dispersion-strengthening nanofeatures (NFs) that, along with fine grains and high dislocation densities, provide remarkably high tensile, creep, and fatigue strength. The NFs are stable under irradiation up to 800℃ and trap He in fine-scale bubbles, suppressing void swelling and fast fracture embrittlement at lower temperatures and creep rupture embrittlement at high temperatures. The current state of the development and understanding of NFAs is described, along with some significant outstanding challenges.
机译:先进的裂变和未来的聚变能将需要具有优异性能的新型高性能结构合金,这些合金必须在超苛刻环境下长期使用才能保持下去,包括中子损坏会导致每个原子产生200个原子位移,并且对于聚变,会产生2000 appm的He。在简要描述了辐照损伤和抗损伤性之后,我们将重点介绍新兴类别的纳米结构铁素体合金(NFA),它们有望应对这些挑战。 NFA包含超高密度的Y-Ti-O富集的分散强化纳米特征(NFs),以及细晶粒和高位错密度,可提供非常高的拉伸强度,蠕变强度和疲劳强度。 NFs在高达800℃的辐射下稳定,并能将He捕获在细小气泡中,从而抑制了空隙膨胀和在较低温度下的快速脆化,以及在高温下的蠕变断裂。描述了NFA的发展和理解的当前状态,以及一些重大的挑战。

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