Isothermal Oxidation Behavior of a New Directionally Solidified Ni-Base Superalloy in Air at Different Temperature

Lei Wang; Yan Huang; Zhuo Zhao; Yang Liu; Jian Tao Wu; Ping Yan

doi:10.4028/www.scientific.net/MSF.654-656.538

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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Isothermal Oxidation Behavior of a New...

Isothermal Oxidation Behavior of a New Directionally Solidified Ni-Base Superalloy in Air at Different Temperature

Abstract:

The isothermal oxidation behaviour under static atmosphere of a new directionally solidified Ni-base superalloy was investigated. The results showed that the oxidation kinetics curves of the alloy follow parabolic law in the temperature range of 750-950°C. The diffusion activation energy Q is to be about 244.86 kJ•mol-1 and the oxidation within this temperature range is mainly controlled by Cr3+ diffusion among Cr2O3 oxidation film. The oxidation resistance grade of the alloy is perfect anti-oxidation within 750-850°C, and anti-oxidation within 900-950°C. The oxidation film can be divided into TiO2, Cr2O3+TiTaO4+NiCr2O4, Al2O3 and TiN layers, from the surface to inside. Priority oxidation and the inside oxidation of Al are considered with the oxidation of Ti and the depletion of Cr, and it is the key point for the improving of oxidation resistance.

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Materials Science Forum (Volumes 654-656)

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538-541

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https://doi.org/10.4028/www.scientific.net/MSF.654-656.538

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Online since:

June 2010

Authors:

Lei Wang, Yan Huang, Zhuo Zhao, Yang Liu, Jian Tao Wu, Ping Yan

Keywords:

Isothermal Oxidation, Ni Based Superalloy, Oxidation Kinetic, Oxidation Mechanism

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