In-situ synchrotron investigation of the elastic and tensile properties of oxide dispersion strengthened EUROFER97 steel

DOI: 10.1016/j.actamat.2024.119876

Authors: Tay Sparks (University of Birmingham) , Slava Kuksenko (UK Atomic Energy Authority) , Michael Gorley (UK Atomic Energy Authority) , Jan Hoffmann (Karlsruhe Institute of Technology) , Yu-Lung Chiu (University of Birmingham) , Thomas Connolley (Diamond Light Source) , Michael Rieth (Karlsruhe Institute of Technology) , Yiqiang Wang (UK Atomic Energy Authority) , Biao Cai (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 45

State: Published (Approved)
Published: April 2024
Diamond Proposal Number(s): 19251

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% Y2O3 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.

Journal Keywords: ODS ferritic steel; Elastic Properties; X-ray synchrotron radiation; Tensile testing; Mechanical properties (high-temperature deformation)

Diamond Keywords: Alloys; Nuclear Fusion Reactors

Subject Areas: Materials, Engineering


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 08/04/2024 09:31

Documents:
1-s2.0-S1359645424002295-main.pdf

Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology Metallurgy

Technical Tags:

Diffraction