Coarsening Kinetics of Y2O3 Dispersoid in New Grade of Fe-Al-Cr-Based ODS Alloy

0555109 - ÚFM 2023 RIV CH eng J - Journal Article
Holzer, Jakub - Gamanov, Štěpán - Luptáková, Natália - Dlouhý, Antonín - Svoboda, Jiří
Coarsening Kinetics of Y2O3 Dispersoid in New Grade of Fe-Al-Cr-Based ODS Alloy.
Metals. Roč. 12, č. 2 (2022), č. článku 210. E-ISSN 2075-4701
R&D Projects: GA ČR GX21-02203X
Institutional support: RVO:68081723
Keywords : oxidation behavior * temperature * iron * microstructure * evolution * scales * oxide dispersion strengthened (ODS) alloy * dispersoid coarsening * particle size stability * microstructure
OECD category: Materials engineering
Impact factor: 2.9, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2075-4701/12/2/210

Oxide dispersion strengthened (ODS) alloys with a high content of Al are candidate materials for extreme high temperature applications such as turbine blades and other components working at temperatures significantly above 1000 degrees C. While oxidation kinetics of Fe-Al ODS steels is frequently studied, the stability and growth kinetics of strengthening oxide dispersion is a rarely studied topic. The Fe-10Al-4Cr-4Y(2)O(3) is an experimental material, fabricated at IPM by powder metallurgy route and contains much higher volume fraction of Y2O3 than similar materials. Stability and growth kinetics of Y2O3 particles of our material are studied on 24 samples aged for 0.5, 1, 2, 4, 8, 16, 32 and 72 h at 1200 degrees C, 1300 degrees C and 1400 degrees C. The sizes of at least 600 individual Y2O3 particles are measured on each sample to obtain extensive statistical analysis of the particle growth. The average particle size coarsens from 28.6 +/- 0.7 nm to 36.9 +/- 0.9 nm in 1200 degrees C series and to 81.4 +/- 5.6 nm in 1400 degrees C series. The evaluated activation energy of coarsening of Y2O3 particles is 274 +/- 65 kJ. The effects of particle coarsening on mechanical properties is demonstrated by HV measurements, which is in very good agreement with the Orowan theory.
Permanent Link: http://hdl.handle.net/11104/0330844