Authors: Younes, C. M.; Allen, G. C.; Nicholson, J. A.

Source: Corrosion Engineering, Science and Technology, Volume 42, Number 1, March 2007 , pp. 80-88(9)

Publisher: Maney Publishing

Abstract:

This paper describes the oxidation behaviour of two technologically important nickel based superalloys, RR3000 and CMSX-4, used extensively in gas turbine blade applications. Oxidation tests were conducted in air at 1100°C for equal and extended periods of time, up to 100 h to compare the superalloys characteristic properties. The morphology of oxide growth in the test samples was investigated using metallography, SEM, EDX, X-ray diffraction (XRD) and Cr³⁺ photoluminescence spectroscopy. The results indicated that irrespective of the duration of exposure, alloy RR3000 develops a much thicker oxide scale than alloy CMSX-4. Examination of cross-sections revealed that the scale grown on the alloy RR3000 is porous and has a three layered structure consisting of an outer layer of (Ni, Co)O; a sublayer of CrTaO₄ rich oxide with different spinels; and an inner layer of ?-Al₂O₃. By contrast, the scale that forms on alloy CMSX-4 is compact and consists of two layers. The upper layer is primarily composed of spinels (Ni,Co)Al₂O₄ and (Ni,Cr)₂O₄, and the inner layer of ?-Al₂O₃. Residual stress measurements using luminescence spectroscopy point to a weak adhesion of the oxide scale to the substrate for alloy RR3000 and a strong adhesion for alloy CMSX-4.

Keywords: OXIDE STRUCTURE; SUPERALLOYS; OXIDATION; CHARACTERISATION; SINGLE CRYSTALS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174327807X159925

Publication date: 2007-03-01

More about this publication?

• Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.

  This journal features top 10 articles which are freely available. Please click here and click on the 'Top articles' link in the right-hand menu to view the list and start downloading.

• Editorial Board
• Information for Authors
• Subscribe to this Title
• Terms & Conditions
• Online submission site
• Top 10 Articles
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Mining & Metallurgy
• By this author: Younes, C. M. ;  Allen, G. C. ;  Nicholson, J. A.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers