About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
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Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Synergistic Nanoscale Precipitation in Austenitic Steels as Revealed by Atom-Probe Tomography |
Author(s) |
Colin A. Stewart, Richard W Fonda, Keith E Knipling, Patrick G Callaham, Paul K Lambert |
On-Site Speaker (Planned) |
Colin A. Stewart |
Abstract Scope |
A new family of precipitation-strengthened FCC Austenitic steels has been developed via an integrated computational materials engineering (ICME) approach, achieving impressive hardness values over 500 HV, for an estimated yield strength of ~180 ksi. An Austenitic Fe–17.7Mn–10.0Ni–5.0Al–4.7Cr–4.0Cu–0.48C (wt.%) alloy produces three nano-scale phases upon ageing, without prior rolling steps: (i) insoluble Cu (FCC) particles; (ii) ordered intermetallic β-NiAl (B2) precipitates; and (iii) carbides. In this series of alloys, the formation of β-NiAl particles is only observed with Cu additions, suggesting a precipitation synergy between these particles. 3D data from atom-probe tomography is used to investigate the mechanisms of particle formation and synergy. The evolution of precipitate microstructures are evaluated at various ageing time steps to assess particle size and distribution, chemical segregation, and particle co-location. The insight gained from this analysis will help inform future ICME development of other precipitation strengthened alloys. |
Proceedings Inclusion? |
Definite: Other |