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In-Situ synchrotron investigation of elastic and tensile properties of oxide dispersion strengthened EUROFER97 steel for advanced fusion reactors.

Authors :
Sparks, Tay
Kuksenko, Viacheslav
Gorley, Michael
Hoffmann, Jan
Chiu, Yu-Lung
Connolley, Thomas
Rieth, Michael
Wang, Yiqiang
Cai, Biao
Source :
Acta Materialia. Jun2024, Vol. 271, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

The augmentation of mechanical properties of reduced activation ferritic martensitic steels through the introduction of creep resistant nano-oxide particles produces a class of oxide dispersion strengthened steels, which have attracted significant interest as candidates for first wall supporting structural materials in future nuclear fusion reactors. In the present work, the effect of temperature on the elastic properties and micro-mechanics of 0.3 wt% Y 2 O 3 oxide dispersion strengthened steel EUROFER97 is investigated using synchrotron high energy X-ray diffraction in-situ tensile testing at elevated temperatures, alongside the non-oxide strengthened base steel as a point of comparison. The single crystal elastic constants of both steels are experimentally determined through analysis of the diffraction peaks corresponding to specific grain families in the polycrystalline samples investigated. The effect of temperature on the evolving dislocation density and character in both materials is interrogated, providing insight into deformation mechanisms. Finally, a constitutive flow stress model is used to evaluate the factors affecting yield strength, allowing the strengthening contribution of the oxide particles to be assessed, and correlation between the thermally driven microstructural behaviour and macroscopic mechanical response to be determined. in-situ XRD tensile testing of ODS EUROFER97 steel at high temperatures. [Display omitted] [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13596454
Volume :
271
Database :
Academic Search Index
Journal :
Acta Materialia
Publication Type :
Academic Journal
Accession number :
176647544
Full Text :
https://doi.org/10.1016/j.actamat.2024.119876