| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
New Frontiers in Physical Metallurgy of Steels
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| Presentation Title |
Microstructural Modeling and Design in Triple Nano-precipitate Strengthened Austenitic Steel |
| Author(s) |
Colin A. Stewart, Richard W. Fonda, Keith E. Knipling, Patrick G. Callahan |
| On-Site Speaker (Planned) |
Colin A. Stewart |
| Abstract Scope |
A new family of precipitate-strengthened FCC Austenitic steels stabilized by Mn additions has been developed with an integrated computational materials engineering (ICME) approach, achieving impressive hardness values over 500 HV, for an estimated yield strength of ~170 KSI. This system exhibits precipitation of 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. This nano-structure is observed directly by atom probe tomography (APT) across a variety of compositions and ageing times, and is modeled with ICME tools, Thermo-Calc and TC-PRISMA. This presentation will discuss the effects of composition and applied heat treatment on the observed material microstructures, and how they can be rapidly predicted by ICME tools. The microstructures will also be correlated with strengthening models, which will be compared with estimated yield strengths from experimental hardness measurements. |