Department of Metallurgical and Materials Engineering
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Browsing Department of Metallurgical and Materials Engineering by Author "Konca, Erkan"
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Item INVESTIGATION OF THE HIGH TEMPERATURE OXIDATION BEHAVIOR OF CVD ALUMINIZED INCONEL 718 AND INCONEL 738LC SUPERALLOYS(2022-03-09) Telbakiroğlu, Yusuf Burak; Konca, ErkanThis study was undertaken to investigate and compare the high temperature oxidation behavior of aluminized Inconel 718 and Inconel 738LC nickel based superalloys. Bare and high activity chemical vapor deposition (CVD) aluminized Inconel 718 and Inconel 738LC samples were oxidized in air at 925, 1000 and 1050°C for 200 hours. Detailed cross-sectional examinations, elemental analyses, weight change measurements, and x-ray diffraction studies were performed in order to investigate and evaluate the oxidation mechanisms of the samples. It was observed that the oxidation resistances of both 718 and 738LC alloys were significantly improved by the protective Al2O3 layer formed on the NiAl phase that was created on the surfaces of the samples during aluminizing. The beneficial effect of aluminizing was found to be more evident in the case of 738LC alloy samples which showed lower oxidation rates at all test temperatures. It is suggested that the higher aluminum content of the 738LC alloy substrate slows down the diffusion flux of Al away from the NiAl phase and hence this is the main reason for its superior oxidation resistance.