| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
ICME Design of β-NiAl + Cu + VC Triple Nano-precipitate Strengthened Austenitic Steel |
| Author(s) |
Colin A. Stewart, Paul K. Lambert, Richard W. Fonda, Keith E. Knipling, Patrick G. Callahan |
| On-Site Speaker (Planned) |
Colin A. Stewart |
| Abstract Scope |
A novel series of precipitate-strengthened FCC Austenitic steels stabilized by Mn additions has been developed via an integrated computational materials engineering (ICME) approach, achieving impressive hardness values over 500 HV, for an estimated yield strength of ~170 KSI. Investigation of this system has identified three nano-scale phases upon ageing, without prior rolling steps: (i) insoluble Cu (FCC) particles; (ii) ordered intermetallic β-NiAl (B2) precipitates; and small amounts of (iii) M23C6. Additional compositional modifications guided by ICME have been undertaken to stabilize nano-scale VC particles at a higher phase fraction, and in place of, M23C6. These VC particles have enabled an expanded range of age hardening heat treatments, as well as multiple possible interactions between β-NiAl + Cu + VC phases in this new alloy. The ability to tailor precipitate interactions though multi-step heat treatments, as characterized via microindentation and atom probe tomography (APT), will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, ICME, Other |