ISOTHERMAL OXIDATION BEHAVIOR OF A SINGLE CRYSTAL NICKEL-BASED SUPERALLOY

J Chin Soc Corr Pro

2010, Vol. 30

Issue (4): 337-340 DOI:

Research Articles

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ISOTHERMAL OXIDATION BEHAVIOR OF A SINGLE CRYSTAL NICKEL-BASED SUPERALLOY

ZHANG Zehai¹, MENG Jie²

1. AVIC Shenyang Liming Aero-Engine (Group) Copporation Ltd. Shenyang 110043
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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Abstract

The oxidation behavior of a single crystal superalloy at 900℃ and 1000℃ in air was investigated by using discontinuous thermogravimetric analysis (TGA). The oxidized samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed the oxidation kinetics of the alloy at 900℃ and 1000℃ followed parabolic law basically. The oxidation resistance of the alloy at 900℃ and 1000℃ was the first grade, while the rate of oxidation at 1000℃ was higher than that at 900℃. The oxidation scales were composed of (Ni,Co)O prevalently. However, α-Al₂O₃, less Cr₂O₃ and complex oxides, such as CrTaO₄, (Ni,Co)Al₂O₄ and Co(Al,Cr)₂O₄ were found in the oxidation scales. The scales were layered with outer (Ni,Co)O layer and inner α-Al₂O₃ layer. The inner α-Al₂O₃ layer was continuous and dense and then provided good protection. Furthermore, there were nitride precipitates in the matrix of the alloy and close to the α-Al₂O₃ layer.

Key words: single crystal nickel-based superalloy isothermal oxidation

Received: 07 May 2010

ZTFLH:

TG132.3

Corresponding Authors: ZHANG Zehai E-mail: zzhhjrw@163.com

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Cite this article:

ZHANG Zehai, MENG Jie. ISOTHERMAL OXIDATION BEHAVIOR OF A SINGLE CRYSTAL NICKEL-BASED SUPERALLOY. J Chin Soc Corr Pro, 2010, 30(4): 337-340.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I4/337

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