Abstract

Elaboration, high temperature oxidation test and metallographic characterization of a chromium-vanadium alloy

Author(s): A�������¯da Dieye, Elodie Conrath, Patrice Berthod

Neighbour to more common elements for superalloysÂ’ base (Co, Ni, Fe), chromium is itself a potentially very interesting element for this role thank to its elevated refractoriness and its beneficial effect on the high temperature oxidation behaviour of many metallic alloys devoted to uses in hot atmospheres. In this work a Cr-10V alloy was elaborated by casting and it was structurally characterized by electron microscopy and X-ray diffraction. Hardness at room temperature and oxidation rate at 1200°C were specified. Melting using a high frequency induction furnace under argon led to total melting and solidification of a {not melted part}-free and a {chemical segregation}-free alloy. This one was of not high hardness and easy to machine. In contrast its oxidation at 1200°C was very fast and almost linear, leading to particularly high final mass gain. In contrast no scale spallation occurred during cooling. Since the high refractoriness, the easy machinability and the absence of scale spallation at cooling are the sole qualities of this alloy, this one must be improved inn terms of high temperature mechanical and chemical properties. Carbides or intermetallic precipitates in bulk and deposition of another alloy on surface may be solutions to succeed in taking benefits of the previous qualities of such alloy.