PSI - Issue 42

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 42 (2022) 1576–1583

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The Fe-Al based oxide dispersion strengthened (ODS) alloys are investigated since the 1960’s. The alloys are produced by mechanical alloying of metal and Y 2 O 3 powders followed by hot consolidation such as extrusion, rolling or rotary swaging. The oxides are dissolved during mechanical alloying in the matrix and they subsequently precipitate during the hot consolidation and thermal treatment. The processing involves several parameters which need to be carefully optimized and controlled to produce a successful alloy with excellent creep properties. The presented systematic testing and microstructure studies are necessary to identify the values of the most important parameters. The coarse-grained ferritic Fe-10Al-4Cr-4Y 2 O 3 oxide dispersion strengthened alloy exhibits top creep and oxidation resistance. Compared to commercial INCOLOY MA956 it involves twice more Al, ten times more Y 2 O 3 precipitates and exhibits twice higher creep strength at 1100-1300 °C. Moreover, the creep rate is practically immeasurable and the time to fracture reaches several thousands of hours at applied stresses of 60-70 % of the ultimate strength under the strain rate 10 -6 s -1 in the order of 120 MPa at 1100 °C and 60 MPa at 1300 °C. The paper describes decisive processing steps and characterizes the most important microstructural and mechanical properties. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: "high temperature; creep; strength; oxide; dispersion; nanocomposite" strength unde -6 -1 e n access article unde 23 European Conference on Fracture - ECF23 Processing of top creep and oxidation resistant Fe-Al based ODS alloys Petr Dymáček a *, Radim Kocich b,a , Lenka Kunčická a , Milan Jarý a , Natália Luptáková a , Jakub Holzer a , Bohuslav Mašek c , Jiří Svoboda a a Institute of Physics of Materials Czech Acasemy of Sciences, Žižkova 22, Brno, 616 62 Czech Republic b Faculty of Materials Science and Technology, VSB-TU Ostrava, 17. listopadu 15, Ostrava – Poruba, 708 00, Czech Republic c Faculty of Electrical Engineering,University of West Bohemia, Univerzitní 26, Plzeň, 306 14, Czech Republic a

* Corresponding author. Tel.: +420 532290411; fax: N/A E-mail address: pdymacek@ipm.cz

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.199