Processing of iron aluminides

Sundar, RS and Baligidad, RG and Prasad, YVRK and Sastry, DH (1998) Processing of iron aluminides. In: Materials Science and Engineering A, 258 (1-2). pp. 219-228.

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Abstract

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.

Item Type:	Journal Article
Publication:	Materials Science and Engineering A
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Intermetallics;Iron aluminides;Processing maps;Electroslag remelting;Deformation mechanism;Superplasticity
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Mar 2007
Last Modified:	19 Sep 2010 04:36
URI:	http://eprints.iisc.ac.in/id/eprint/10385

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