About this Abstract |
Meeting |
TMS Specialty Congress 2025
|
Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
Presentation Title |
Segmenting Multi-Phase Nano-Precipitates for Yield Stress Modeling in Novel High-Strength Austenitic Steel |
Author(s) |
Colin A. Stewart, Edwin A Antillon, Keith E Knipling, Patrick G Callahan, David J Rowenhorst, Jaafar A El-Awady, Markus Sudmanns |
On-Site Speaker (Planned) |
Colin A. Stewart |
Abstract Scope |
We have developed a novel series of FCC Austenitic steels with estimated yield strengths over 180 ksi through the formation of nano-scale precipitates: (i) insoluble FCC Cu particles, (ii) ordered intermetallic NiAl precipitates, and (iii) vanadium carbide. By applying atom-probe tomography (APT), 3D reconstructions of the nanostructures in various ageing conditions were collected. The precipitation of equilibrium B2-NiAl was observed to occur via a precursor L12-NiAl phase through synergy with Cu additions, or via heterogeneous precipitation on VC nano-precipitates. Thus, a wide range of microstructures are possible in these steels, leading to vastly different mechanical properties. A yield strength modeling approach has been undertaken that incorporates this granularity in microstructure, however, APT characterization and segmentation of the nano-scale precipitates is critical. This talk will discuss the sensitivity of yield strength modeling to particle segmentation approaches, and how additional techniques such as TEM and XRD may supplement and validate these findings. |
Proceedings Inclusion? |
Undecided |