Mechanical properties and stability of precipitates of an ODS steel after thermal cycling and aging

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Show simple item record Oñoro Salaices, Moisés Macías Delgado, Julio Auger Martínez, María Angustias Castro Bernal, María Vanessa de Leguey Galán, Teresa 2021-03-24T10:04:27Z 2021-03-24T10:04:27Z 2020-08
dc.identifier.bibliographicCitation Oñoro, M., Macías-Delgado, J., Auger, M. A., de Castro, V. & Leguey, T. (2020). Mechanical properties and stability of precipitates of an ODS steel after thermal cycling and aging. Nuclear Materials and Energy, 24, 100758.
dc.identifier.issn 2352-1791
dc.description.abstract The thermal stability of an ODS RAF steel has been investigated by assessing the effects of different thermal treatments on its microstructure and mechanical behavior. The ODS steel, with nominal composition Fe-14Cr-2W-0.4Ti-0.3Y2O3 (wt. %), was manufactured by mechanical alloying, compacted by hot isostatic pressing and hot cross rolling. Following the rolling process, short thermal treatments at temperatures between 1073 and 1473 K were applied, and an optimal annealing temperature of 1273 K was selected. Afterwards, two independent thermal treatments were applied. To check the effects of thermal fatigue, a set of samples was submitted to thermal cycling between 773 and 1073 K. Finally, another batch was thermally aged at 873 K for 2000 h. A Vickers microhardness analysis shows a hardening effect with the thermal cycling and the aging treatments. The cycling treatment causes a small improvement of yield and tensile strengths at test temperatures T > 773 K, without clear ductility changes. The aging treatment slightly enhances tensile properties for tests at T > 873 K, together with loss of strength and ductility in tests at T < 873 K. Microstructural investigations show no changes in the grain structure. However, the oxide and Cr-W-rich secondary phases studied in this work present different behaviors. Ti-rich oxides appear quite stable, without significant variations in their location, composition, morphology, and size distribution. With respect to the existing Cr-W-rich precipitates, the aging treatment promoted their redistribution and diffusion along grain boundaries, together with compositional changes, which would account for the slight strengthening and loss of ductility observed.
dc.format.extent 8
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2020 The Authors.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.subject.other Ods steel
dc.subject.other Thermal treatment
dc.subject.other Tensile test
dc.subject.other Microstructure
dc.subject.other Secondary phases
dc.title Mechanical properties and stability of precipitates of an ODS steel after thermal cycling and aging
dc.type article
dc.subject.eciencia Física
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. ENE2015-70300-C3-2-R
dc.relation.projectID Comunidad de Madrid. 2017-T1/IND-5439
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 100758
dc.identifier.publicationlastpage 8
dc.identifier.publicationtitle Nuclear Materials and Energy
dc.identifier.publicationvolume 24
dc.identifier.uxxi AR/0000026462
dc.contributor.funder Ministerio de Economía y Competitividad (España)
dc.contributor.funder Comunidad de Madrid
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