Phase transformations in an Fe-7. 8Al-29. 5Mn-1. 5Si-1. 05C alloy

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02666330· OSTI ID:6269570

Chao, C Y ^[1]; Liu, T F ^[2]

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1. National Chiao Tung Univ., Hsinchu (Taiwan, Province of China). Inst. of Mechanical Engineering
2. National Chiao Tung Univ., Hsinchu (Taiwan, Province of China). Inst. of Materials Science and Engineering

Phase transformations in an Fe-7.8Al-29.5Mn-1.5Si-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)[sub 3]AlC 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 [gamma] [r arrow] coarse (Fe,Mn)[sub 3]AlC carbide + DO[sub 3] reaction occurred by a cellular precipitation on the [gamma]/[gamma] 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 ([gamma]), and (Fe,Mn)[sub 3]AlC carbides could only be observed within the austenite matrix in the aged alloys. In addition, a [gamma] [r arrow] [alpha] (ferrite) + coarse (Fe,Mn)[sub 3]AlC carbide reaction or a [gamma][r arrow] [alpha] + coarse (Fe,Mn)[sub 3]AlC carbide + [beta]-Mn reaction was found to occur on the [gamma]/[gamma] grain boundary in the aged Fe-Al-Mn-C alloys.

• OSTI ID: 6269570
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24:9; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
AGING
ALLOYS
ALUMINIUM ALLOYS
AUSTENITE
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
CARBON STEELS
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FERRITE
GRAIN BOUNDARIES
HEAT TREATMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MICROSCOPY
MICROSTRUCTURE
NUMERICAL DATA
OPTICAL MICROSCOPY
PHASE TRANSFORMATIONS
QUENCHING
SILICON ALLOYS
STEELS
TRANSMISSION ELECTRON MICROSCOPY