| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
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| Symposium
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Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales IV
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| Presentation Title |
Predicting Yield Strength in β-NiAl + Cu + VC Triple Nano-precipitate Strengthened Austenitic Steel |
| Author(s) |
Colin A. Stewart, Edwin Antillon, Richard Fonda, Keith Knipling, Patrick Callaham, Paul Lambert |
| On-Site Speaker (Planned) |
Colin A. Stewart |
| Abstract Scope |
A novel series of Mn-stabilized Austenitic steels strengthened by nano-precipitates has been developed using integrated computational materials engineering (ICME). These steels can achieve impressive hardness values over 560 HV (estimated σy ~200 ksi). An Austenitic Fe–17.7Mn–10.0Ni–5.0Al–4.7Cr–4.0Cu–1.0V–0.48C (wt.%) alloy produces three nano-scale phases upon ageing: (i) insoluble Cu; (ii) intermetallic β-NiAl; and (iii) VC. In these alloys, the microstructures as observed by atom probe tomography (APT) will vary not only on alloy composition, ageing time and temperature, but will also depend on precipitation synergies between phases (i-iii). Factors that may influence the yield strengths of these materials include the volume fractions, number densities, size distributions, and morphologies of the precipitate phases. This presentation will discuss modeling the yield strength of these alloys using microindentation, microstructural data from APT, molecular dynamics, and theoretical models. Comparisons will also be made between experimental data vs ICME tools such as TC-PRISMA. |