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Improvement in High Temperature Oxidation Resistance of Co-Al-W Based Superalloys

Published online by Cambridge University Press:  18 March 2015

Takahiko Ito ,
Shogo Ikeda  and
Katsushi Tanaka
Takahiko Ito
Affiliation:
Department of Mechanics, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.
Shogo Ikeda
Affiliation:
Department of Mechanics, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.
Katsushi Tanaka
Affiliation:
Department of Mechanics, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.
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Abstract

Oxidation tests of Cr containing Co-based superalloys with compositions of Co-20at.%Ni-9at.%Al-9at.%W-x at.%Cr (x = 2, 4, 6, 8 and 10) have been carried out at 1173 and 1273 K in air. Oxidation resistance is improved upon alloying with Cr not only at 1173 K but also at 1273 K. The weight gain of the 10at.%Cr alloy oxidized at 1173 K is similar to that of the 5th generation Ni-based superalloy of TMS-173. Alloying with Cr is efficient to improve oxidation resistance, however, the shape of γ’ precipitates is rounded and the alignment of the precipitates along the <100> direction becomes less pronounced upon alloying with Cr.

Keywords

Cooxidationstructural

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Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy02-02
Copyright
Copyright © Materials Research Society 2015 

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