Yen-Ling Kuo, Koji Kakehi, Makoto Nanko, Shigenari Hayashi
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Abstract
High temperature oxidation of Ni–19Fe–19Cr–5Nb alloys (based on the chemical composition of Alloy718) with different Al contents were investigated to elucidate the effect of Al on oxidation kinetics and scale formation during exposure at 800 °C in air. The experimental results indicated that the oxidation kinetics decreased with increasing Al content. The beneficial effect of Al could be attributed to be a result of the formation of γ′-Ni3Al, which stabilizes γ′′-Ni3(Nb,Al) and kinetically prohibits the coarsening of γ′′-Ni3(Nb,Al) phases. Faster dissolution of finer γ′′-Ni3(Nb,Al) precipitates due to greater γ-matrix / γ′′-Ni3(Nb,Al) interface region in as-received Al-containing alloys could supply greater Nb flux for the formation of CrNbO4, which promotes the formation of an exclusive Cr2O3 scale at the initial stage of oxidation.
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Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.
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