Isothermal High-Temperature Oxidation Behaviour of Nickel-Based Superalloy IN740H

Singh, R K and Paswan, S (2024) Isothermal High-Temperature Oxidation Behaviour of Nickel-Based Superalloy IN740H. Transactions of Indian Institute of Metals .

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The isothermal oxidation behavior of IN740H alloy was studied by conducting experiments in a thermogravimetric analyzer in the presence of air and synthetic flue gas in the temperature range of 760-900 degrees C. SEM/XRD/EPMA/Raman spectroscopy was used for analyzing surfaces/cross sections of oxidized/corroded specimens. The oxide layer consists of Ti-doped Cr2O3 and NiCr2O4 in air-oxidized specimens, whereas additional NiO and NiS form in the presence of flue gas at 900 degrees C. Alumina forms at the oxide/matrix interface and at 900 degrees C; it was followed by gamma ' denuded zone with dispersed (Ti, Nb)C. The kinetics of oxidation in a steady state are found to be sub-parabolic for all the conditions.

Item Type:Article
Official URL/DOI:https://10.1007/s12666-023-03233-4
Uncontrolled Keywords:IN 740H, High-temperature oxidation, advanced ultra-supercritical, cycle fatigue behavior, hot corrosion, kinetics, NIMONIC 263, alloys
Divisions:Material Science and Technology
ID Code:9497
Deposited By:HOD KRIT
Deposited On:27 Feb 2024 15:25
Last Modified:27 Feb 2024 15:25
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