| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Steel Metallurgy
|
| Presentation Title |
Triple Nano-precipitate Strengthened Austenitic Steel |
| Author(s) |
Colin A. Stewart, Richard W Fonda, Keith E Knipling |
| On-Site Speaker (Planned) |
Colin A. Stewart |
| Abstract Scope |
FCC austenitic steels lack the ability to achieve significant solid solution strengthening, thus precipitate phases may instead be employed to achieve alloy strengthening upon ageing. A cost-effective Mn-stabilized austenitic steel has been engineered via an ICME approach, which demonstrates precipitation of three nano-scale phases: (i) insoluble Cu (FCC) particles; (ii) ordered intermetallic β-NiAl (B2) precipitates; and (iii) carbides. The evolution and interaction of these precipitates has been investigated across ageing times by atom probe tomography (APT) in combination with transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). These techniques help elucidate the mechanisms of particle formation, as well as the crystallographic relationships between platelet-shaped β-NiAl odered BCC precipitates and the FCC matrix. Results are discussed in the context of refining computational models for an efficient ICME alloy design approach. |