| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Engineering Yield Strength by Tailoring the Nano-Precipitation Sequence in
Novel Mn-Stabilized Austenitic Steel
|
| Author(s) |
Colin A. Stewart, Edwin A Antillon, Keith E Knipling, Patrick G Callahan, David J Rowenhorst, Paul K Lambert |
| On-Site Speaker (Planned) |
Colin A. Stewart |
| Abstract Scope |
Using integrated computational materials engineering (ICME), we have developed a novel series of FCC Austenitic steels with the potential to achieve yield strengths over 180 ksi through the formation of three nano-scale precipitate phases upon ageing: (i) insoluble FCC Cu particles, (ii) ordered intermetallic NiAl precipitates, and (iii) VC precipitates. The age hardenability was rapidly evaluated by microindentation, and the precipitation sequences were assessed by atom-probe tomography across a range of ageing time steps, temperatures, and alloy compositions. Tensile specimens were then machined to evaluate the macroscopic mechanical properties of select alloy conditions. This presentation will discuss the interaction mechanisms among the different precipitate phases and how those relationships change across the design space. In particular, we will discuss leveraging this fundamental understanding of the precipitation sequences to engineer more favorable nano-scale particle distributions through modifications in the alloy composition and heat treatment, guided by ICME. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, ICME, Mechanical Properties |