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ISOTHERMAL OXIDATION BEHAVIOR OF A CAST Ni-BASE SUPERALLOY K447

Zhao Yue, Yang Gong-xian

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Abstract

The oxidation behavior of a cast Ni-base superalloy K447 in air ina temperature range of 700 to 950℃ for period up 100h has been studied.The results indicate that oxidation kinetics obey parabolic law,there with the grade of oxidation resistance of the alloy has been given.The oxide scales were examined by SEM,X-ray diffraction and ESA.The results show that oxide scales are composed of a loose top layer consisted of oxides of Ti and Cr,compact intermediate layer Cr_2O_3,as well as discrete internal oxide layer of Al_2O_3.

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What this paper is about

The oxidation behavior of a cast Ni-base superalloy K447 in air ina temperature range of 700 to 950℃ for period up 100h has been studied.The results indicate that oxidation kinetics obey parabolic law,there with the grade of oxidation resistance of the alloy has been given.The oxide scales were examined by SEM,X-ray diffraction and ESA.The results show that oxide scales are composed of a loose top layer consisted of oxides of Ti and Cr,compact intermediate layer Cr_2O_3,as well as discrete internal oxide layer of Al_2O_3.

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Available abstract

The oxidation behavior of a cast Ni-base superalloy K447 in air ina temperature range of 700 to 950℃ for period up 100h has been studied.The results indicate that oxidation kinetics obey parabolic law,there with the grade of oxidation resistance of the alloy has been given.The oxide scales were examined by SEM,X-ray diffraction and ESA.The results show that oxide scales are composed of a loose top layer consisted of oxides of Ti and Cr,compact intermediate layer Cr_2O_3,as well as discrete internal oxide layer of Al_2O_3.

Key concepts: Superalloy, Materials science, Isothermal process, Oxide, Alloy, Layer (electronics), Metallurgy, Corrosion

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