About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
High Performance Steels
|
Presentation Title |
Designing the Precipitation Sequence in Triple Nano-precipitate Strengthened Austenitic Steel |
Author(s) |
Colin A. Stewart, Richard W. Fonda, Keith E. Knipling, Patrick G. Callahan, 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 estimated yield strengths over 180 ksi through the formation of three nano-scale precipitate phases: (i) insoluble FCC Cu particles, (ii) ordered intermetallic NiAl precipitates, and (iii) VC precipitates. These precipitate distributions form through ageing treatments without any prior mechanical deformation. The age hardenability was evaluated by microindentation, and the precipitation sequences were assessed by atom-probe tomography across a range of ageing time steps, temperatures, and alloy compositions. 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 also 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, Characterization |