2004•Unpublished venueRequires access

Oxidation Kinetics of Cast Ni-Base Superalloy K44

Long Fang, Chao Yuan

Abstract

The oxidation kinetics of a cast Ni-base superalloy K44 at 800 ℃ has been studied by TGA method .The results indicated that oxidation kinetics obeyed parabolic law. The oxidation resistance of the alloy is in the grade 1. The oxide scale was analyzed by X-ray diffraction, scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis(EDX). The results showed that oxide scale was consisted of Cr_2O_3 mainly with a certain amount of NiCr_2O_4 and TiO·TiO_2. During oxidation at 800 ℃, it was found that the internal oxidation of superalloy K44 occurred.

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Key concepts: Superalloy, Kinetics, Scanning electron microscope, Materials science, Oxide, Alloy, Metallurgy, Nichrome