08464 High Temperature Gas Corrosion of Fe-Cr-Ni-Al-La Alloy

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Product Number: 51300-08464-SG

ISBN: 08464 2008 CP

Author: Olga Tsurtsumia, Elguja Kutelia, Boris Bulia, Omar Mikadze, and Sayavur Bakhtiyarov

Publication Date: 2008

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High-chromium (>40%) content Fe-Cr-Ni-Al-La alloy was investigated in different corrosive environment (laboratory air, N2O4, exhaust gas) at various elevated temperatures. Oxidation kinetics, as well as morphology, phase and elemental compositions of the oxide scale developed at the initial oxidation stages were of our interest. It was determined that condition of oxidized surface had defined influence on the process of oxide scale formation at high temperatures; the optimal correlation of preoxidation temperatures enables alloy’s exploitation at 1200-1300OC rather long time owing to the complex composition surface scale with modulated morphology and to its underlying, uniform, continuous alumina layer strongly adhered to metallic matrix. Here, the alumina is responsible for the blocking of ways for cation and anion counter-diffusion at high temperatures. High-chromium Fe-Cr-Ni-Al-La alloy showed rather good stability in the highly corrosive N2O4 environment at 750OC and practically kept its mechanical properties unchangeable. At the temperatures higher then 1300OC it take place a slight creep of the bulk metallic matrix, nevertheless it is still possible can be applied as a coating material for any heat-proof ones in the purpose of increasing the heat and corrosion resistance of underlying substrate making the obtained compositional system effective for utilization around 1400OC.