RT Journal Article
T1 Powder particle size effects on microstructure and mechanical properties of mechanically alloyed ODS ferritic steels
A1 Oñoro Salaices, Moisés
A1 Macías Delgado, Julio
A1 Auger, María A.
A1 Hoffmann, Jan
A1 Castro Bernal, María Vanessa de
A1 Leguey Galán, Teresa
AB Reduced activation ferritic (RAF) steels are expected to be widely used in challenging nuclear industrial applications under severe thermo-mechanical regimes and intense neutron loads. Therefore, actual research panorama is facing the strengthening strategies necessary to maximize both performance and endurance under these conditions. Oxide dispersion strengthened (ODS) RAF steels are leader candidates as structural materials in fusion energy reactors thanks to the reinforcement obtained with a fine dispersion of nanosized oxides in their matrix. In this study, the influence of the initial powder particle size and the selected processing route on the final material has been investigated. Two RAF ODS steels coming from atomized pre-alloyed powders with nominal particle powder sizes of 70 and 30 µm and composition Fe-14Cr-2W-0.4Ti-0.3Y2O3 (wt. %) were manufactured by mechanical alloying. Alloyed powders were compacted by hot isostatic pressing, hot crossed rolled, and annealed at 1273 K. Initial powder particle size differences minimize after milling. Both steels present an almost completely recrystallized material and similar grain sizes. The same type and distributions of secondary phases, Cr-W-rich, Ti-rich, and Y-Ti oxide nanoparticles, have been also characterized by transmission electron microscopy (TEM) in both alloy samples. The strengthening effect has been confirmed by tensile and Charpy impact tests. The two alloys present similar strength values with slightly better ductile brittle transition temperature (DBTT) and ductility for the steel produced with the smaller powder size.
PB MDPI
SN 2075-4701
YR 2022
FD 2022-01
LK https://hdl.handle.net/10016/33995
UL https://hdl.handle.net/10016/33995
LA eng
NO This article belongs to the Special Issue New Developments in Dispersion Strengthening of Metals and Alloys.
NO This investigation has been supported by the AEI (Agencia Estatal de Investigación) with reference AEI/10.13039/501100011033 (project PID2019-105325RB-C33); the Comunidad de Madrid (Spain) through the programs MULTIMAT (S2013/MIT-2862), Talento-CAM (2017-T1/IND-5439), and the multiannual agreement with UC3M ("Excelencia para el Profesorado Universitario"-EPUC3M14).
DS e-Archivo
RD 1 sept. 2024