Processing of high carbon Fe3Al based intermetallic alloy |
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Authors: | R. G. Baligidad U. Prakash A. Radhakrishna |
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Affiliation: | Defence Metallurgical Research Laboratory, Hyderabad-500 058, India |
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Abstract: | A melting procedure for air induction melting (AIM) of an Fe3Al based intermetallic alloy Fe-15.38 wt%Al-1.1 wt%C is described. Use of an appropriate slag cover during AIM results in elimination of hydrogen gas porosity in cast AIM ingots. Criteria for slag selection and slag to metal ratio are discussed. Refining by slag-metal reactions results in significant reduction in impurity levels (S, O, N) during AIM. Consequently, low cost raw materials such as mild steel scrap and commercial aluminium were used for melting the alloy. The AIM ingot exhibited excellent tensile properties. The ductility and hot workability of the ingot may be further improved by subsequent processing through electroslag remelting. It is also argued that the presence of carbon may be necessary to get AIM castings with desirable mechanical properties. |
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Keywords: | A. iron aluminides based on Fe3Al B. mechanical properties at ambient temperature C. casting melting D. microstructure |
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