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Recent status and improvement of reduced-activation ferritic-martensitic steels for high-temperature service

Abstract : Reduced-activation ferritic-martensitic (RAFM) steels, candidate structural materials for fusion reactors, have achieved technological maturity after about three decades of research and development. The recent status of a few developmental aspects of current RAFM steels, such as aging resistance, plate thickness effects, fracture toughness, and fatigue, is updated in this paper, together with ongoing efforts to develop next-generation RAFM steels for superior high-temperature performance. In addition to thermomechanical treatments, including nonstandard heat treatment, alloy chemistry refinements and modifications have demonstrated some improvements in high-temperature performance. Castable nanostructured alloys (CNAs) were developed by significantly increasing the amount of nanoscale MX (M = V/Ta/Ti, X = C/N) precipitates and reducing coarse M23C6 (M = Cr). Preliminary results showed promising improvement in creep resistance and Charpy impact toughness. Limited low-dose neutron irradiation results for one of the CNAs and China low activation martensitic are presented and compared with data for F82H and Eurofer97 irradiated up to ∼70 displacements per atom at ∼300–325c.
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https://hal-cea.archives-ouvertes.fr/cea-02388601
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Submitted on : Monday, December 2, 2019 - 8:44:42 AM
Last modification on : Tuesday, April 28, 2020 - 11:28:14 AM

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L. Tan, Y. Katoh, A.-A.F. Tavassoli, J. Henry, M. Rieth, et al.. Recent status and improvement of reduced-activation ferritic-martensitic steels for high-temperature service. Journal of Nuclear Materials, Elsevier, 2016, 479, pp.515-523. ⟨10.1016/j.jnucmat.2016.07.054⟩. ⟨cea-02388601⟩

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