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Open AccessArticle

Development of New 14 Cr ODS Steels by Using New Oxides Formers and B as an Inhibitor of the Grain Growth

1
Department Materials Science and Engineering, IABB, Universidad Carlos III de Madrid (UC3M), Av. de la Universidad 30, 28911 Leganés, Madrid, Spain
2
IMDEA Materials Institute, C/ Eric Kandel 2, 28906 Getafe, Madrid, Spain
3
Centro de Investigación en Nanomateriales Y Nanotecnologia (CINN-CSIC-UNIOVI-PA), Grupo de Materiales Nanocompuetos y Bioinspirados, Av. de la Vega, 4-6, 33940 El Entrego, Spain
4
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany
5
Materials for Energy Interest Division, CIEMAT, Av. de la Complutense 40, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Metals 2020, 10(10), 1344; https://doi.org/10.3390/met10101344
Received: 4 September 2020 / Revised: 25 September 2020 / Accepted: 2 October 2020 / Published: 8 October 2020
(This article belongs to the Special Issue Spark Plasma Sintering of Metals and Metal Matrix Nanocomposites)
In this work, new oxide dispersion strengthened (ODS) ferritic steels have been produced by powder metallurgy using an alternative processing route and characterized afterwards by comparing them with a base ODS steel with Y2O3 and Ti additions. Different alloying elements like boron (B), which is known as an inhibitor of grain growth obtained by pinning grain boundaries, and complex oxide compounds (Y-Ti-Zr-O) have been introduced to the 14Cr prealloyed powder by using mechanical alloying (MA) and were further consolidated by spark employing plasma sintering (SPS). Techniques such as x-ray diffraction (XRD), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were used to study the obtained microstructures. Micro-tensile tests and microhardness measurements were carried out at room temperature to analyze the mechanical properties of the differently developed microstructures, which was considered to result in a better strength in the ODS steels containing the complex oxide Y-Ti-Zr-O. In addition, small punch (SP) tests were performed to evaluate the response of the material under high temperatures conditions, under which promising mechanical properties were attained by the materials containing Y-Ti-Zr-O (14Al-X-ODS and 14Al-X-ODS-B) in comparison with the other commercial steel, GETMAT. The differences in mechanical strength can be attributed to the precipitate’s density, nature, size, and to the density of dislocations in each ODS steel. View Full-Text
Keywords: ODS steel; mechanical alloying; spark plasma sintering; boron; complex oxides; small punch tests (SP) ODS steel; mechanical alloying; spark plasma sintering; boron; complex oxides; small punch tests (SP)
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Meza, A.; Macía, E.; García-Junceda, A.; Díaz, L.A.; Chekhonin, P.; Altstadt, E.; Serrano, M.; Rabanal, M.E.; Campos, M. Development of New 14 Cr ODS Steels by Using New Oxides Formers and B as an Inhibitor of the Grain Growth. Metals 2020, 10, 1344.

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