| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Mechanical Behavior of Nuclear Reactor Materials and Components IV
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| Presentation Title |
A Density Functional Study of Mechanical Properties for the High-Hardness Intermetallic π-Ferrosilicide Phase |
| Author(s) |
Robert Annewandter, Tessa Davey, Simon Middleburgh, Alexander Knowles |
| On-Site Speaker (Planned) |
Robert Annewandter |
| Abstract Scope |
Structural components such as pumps or valves can be coated with hard-facing materials made from wear-resistant, strong and corrosion-resistant materials like Co-based alloys. However, when irradiated they can form Co-60, a high-intensity gamma-ray emitter (around 1.3 MeV) with a relatively long half-life of 5.27 y, posing a health hazard when exposed to nuclear power plant personnel, and therefore creating a need for cobalt-free replacements.
The highly alloyed, complex Fe-based alloy RR2450 developed by Rolls Royce is designed to replace the Stellite alloy family. Its microstructure consists of a triplex matrix of γ, δ-ferrite and π-ferrosilicide, alongside a dispersion of (Nb,Ti) carbonitrides and M7C3 precipitates.
This work presents an ab-initio density functional theory study of the carbon-rich ((Fe,Ni,Cr)4.18Si0.82) and carbon deficient ((Fe,Ni,Cr)3.92Si1.08) hard π-ferrosilicide phase, using Special Quasi-random Structures (SQS) with supercells of 240 resp 320 atoms, and presents results on alternative compositions replacing Nickel with other metal elements.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Powder Materials, Mechanical Properties |