Abstract
Phase transformations in an Fe-7.8Al-29.5Mn-l.5Si-1.05C alloy have been investigated by means of optical microscopy and transmission electron microscopy. In the as-quenched condition, a high density of fine (Fe,Mn)3AlC carbides could be observed within the austenite matrix. When the as-quenched alloy was aged at temperatures ranging from 550 °C to 825 °C, a γ → coarse (Fe,Mn)3AlC carbide + DO3 reaction occurred by a cellular precipitation on the γ/γ grain boundaries and twin boundaries. Both of the observations are quite different from those observed by other workers in Fe-Al-Mn-C alloys. In their studies, it was found that the as-quenched microstructure was austenite phase (γ), and (Fe,Mn)3AlC carbides could only be observed within the austenite matrix in the aged alloys. In addition, a γ →α (ferrite) + coarse (Fe,Mn)3AlC carbide reaction or a γ →α + coarse (Fe,Mn)3AlC carbide +β-Mn reaction was found to occur on the γ/γ grain boundary in the aged Fe-Al-Mn-C alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 1957-1963 |
| Number of pages | 7 |
| Journal | Metallurgical Transactions A |
| Volume | 24 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 1993 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys