4.7 Article

Ultrafine intralath precipitation of V(C,N) in 12Cr-1MoWV (wt.%) ferritic/martensitic steel

Journal

SCRIPTA MATERIALIA
Volume 197, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113787

Keywords

Ferritic steels; Precipitation; Nitrides; Scanning; transmission electron microscopy; (STEM); Tension test

Funding

  1. U.S. Department of Energy (DOE) Office of Nuclear Energy's Nuclear Energy University Programs (NEUP) [DE-FOA-0001515]
  2. Advanced Steel Processing and Products Research Center (ASPPRC) at Colorado School of Mines

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Ultrafine scale intralath V(C,N) precipitates were found in 12Cr-1MoWV steel, with significant impact on strength depending on nitrogen content. Finer precipitates may have implications for irradiated behavior.
12Cr-1MoWV (wt.%) ferritic/martensitic (F/M) steel is a candidate material for fuel cladding in advanced nuclear reactors. As such, understanding the relationship between microstructure and mechanical properties in the context of irradiation environments for these steels is critical. Here we reveal the presence of ultrafine scale (2-5 nm), intralath V(C,N) precipitates in conventionally heat treated 12Cr-1MoWV steel for the first time. Lower N content results in finer intralath precipitates, whereas higher N content results in larger, elongated disks or needles. N content significantly alters the strength, but not the strain hardening behavior, by its impact on precipitate characteristics. Finer precipitates could have an impact on irradiated behavior, specifically their capacity as defect sinks. The presence of ultrafine scale V(C,N) precipitates in conventionally heat treated 12Cr-1MoWV steel, controlled by N variations, provides a new means for tailoring the strength and irradiation response of F/M steels for nuclear applications. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )

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