Processing of iron aluminides

A processing route comprising of air induction melting (AIM) with protective cover and electroslag remelting (ESR) for production of iron aluminide (Fe 3Al) alloys has been developed. The use of protective cover during AIM results in the minimization of hydrogen gas porosity and a significant reduct...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1998-12, Vol.258 (1), p.219-228
Main Authors: Sundar, R.S., Baligidad, R.G., Prasad, Y.V.R.K., Sastry, D.H.
Format: Article
Language:English
Subjects:
Applied sciences
Deformation mechanism
Electroslag remelting
Exact sciences and technology
Intermetallics
Iron aluminides
Metals. Metallurgy
Processing maps
Production of alloys
Production of metals
Production of non ferrous metals. Process materials
Superplasticity
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Summary:A processing route comprising of air induction melting (AIM) with protective cover and electroslag remelting (ESR) for production of iron aluminide (Fe 3Al) alloys has been developed. The use of protective cover during AIM results in the minimization of hydrogen gas porosity and a significant reduction in the impurity levels (S, O and N). Attempts have been made to further improve the ductility and hot workability through ESR. The AIM melted with high carbon ingots exhibit excellent tensile properties compared to the low (< 0.074 wt.%) carbon ingots where cracks persist even after ESR. Processing maps were developed for vacuum induction melted as-cast binary and ternary (Cr and Mn) Fe 3Al alloys. Processing maps of Fe 3Al and Fe 3Al-Cr exhibit a dynamic recrystallisation domain at temperatures > 1123 K. Dynamic recrystallisation in iron aluminides is controlled by migration of interfaces. In the case of Fe 3Al-Mn, dynamic recrystallisation is suppressed due to greater resistance to the migration of interfaces. Instead, large grain superplasticity is observed.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(98)00937-X