|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels V
||Phase Evolution of Triple Nano-precipitate Strengthened Mn-stabilized Austenitic Steel
||Colin A. Stewart, Richard W Fonda, Keith E Knipling, Patrick G Callahan
|On-Site Speaker (Planned)
||Colin A. Stewart
Precipitation of nano-scale phases upon ageing is a desireable strengthening mechanism in FCC austenitic steels due to the lack of significant solid solution strengthening. An ICME approach has been used to engineer a cost-effective Mn-stabilized austenitic steel that demonstrates precipitation of three nano-scale phases: (i) insoluble Cu (FCC) particles; (ii) ordered intermetallic β-NiAl (B2) precipitates; and (iii) carbides. Atom probe tomography (APT) in combination with transmission electron microscopy (TEM) have been used to assess the evolution of precipitate composition, morphology, and distribution over a variety of ageing times. This characterization is used to determine the potential mechanisms of particle formation, and can be used to refine computational models for an efficient ICME alloy design approach.