JEEP 2009, 00003 (2009)
DOI: 10.1051/jeep/200900003

Phase Equilibrium in the Fe-Cr-Nb Alloys

S. Mansour¹, N. Boutarek¹, H. Aid¹ and S.E. Amara<sup>2

1</sup>  Laboratoire des Sciences et Génie des Matériaux, Faculté de Génie Mécanique et Génie des Procédés
²  Laboratoire d’Electrochimie-Corrosion Métallurgie et Chimie Minérale, Faculté de Chimie, USTHB, BP 32 El Alia, 16111 Bab Ezzouar, Alger, Algérie

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Published online: 4 December 2009

Abstract
The present work is a continuation of research on alloys based on iron, aiming at understanding the solidification behaviour of Fe-Cr-Nb alloys. Ternary Fe-Cr-Nb alloys with different concentrations were arcmelted and systematically characterized by means of; differential thermal analysis, optical and scanning electron microscopy coupled to an energy dispersive X-ray microprobe analysis and X-ray diffraction. For the first time, we suspect the presence of a metastable α’-phase in Fe-rich alloy. For higher vanadium and niobium contents a competition between two eutectics, E2 and E3, is clearly shown according to the observed microstructures and the solidification sequences.

Key words: Ternary diagram -- Phase Equilibrium -- differential thermal analysis -- phase transition -- solidification sequences


© Owned by the authors, published by EDP Sciences 2009