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Title: Effect of cyclic stress and exposure temperature on oxidation damage for a nickel-based superalloy
Authors: Karabela, A.
Zhao, Liguo
Tong, Jie
Simms, N.J.
Nicholls, J.R.
Hardy, M.C.
Keywords: Oxidation
Cyclic stress
Oxide scale
Nickel-based superalloy
Issue Date: 2011
Publisher: © Elsevier
Citation: KARABELA, A. ... et al., 2011. Effect of cyclic stress and exposure temperature on oxidation damage for a nickel-based superalloy. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 528 (19-20), pp. 6194 - 6202.
Abstract: Oxidation damage, combined with fatigue, is a concern for nickel-based superalloys utilised as disc rotors in high pressure compressor and turbine of aero-engines. A study has been carried out for a nickel-based alloy RR1000, which includes cyclic experiments at selected temperatures (700–800 ◦C) and microscopy examination using focused ion beam (FIB). The results suggest that the major mechanism of oxidation damage consists of the formation of surface oxide scales and internal micro-voids and oxide particles beneath the oxide scales, which become more severe with the increase of temperature. Applying a cyclic stress does not change the nature of oxidation damage but tends to enhance the extent of oxidation damage for temperatures at 750 ◦C and 800 ◦C. The influence of cyclic stress on oxidation damage appears to be insignificant at 700 ◦C, indicating a combined effect of cyclic stress and temperature. Further energydispersive X-ray spectrometry (EDXS) analyses show the enrichment of Cr and Ti, together with lower Ni and Co levels, in the surface oxide scales, suggesting the formation of brittle Cr2O3, TiO2, NiO and Co3O4 oxides on the specimen surface. Penetration of oxygen into the material and associated internal oxidation, which leads to further material embrittlement and associated failure, are evidenced from both secondary ion imaging and EDXS analyses.
Description: This article was published in the journal, Materials Science and Engineering: A [© Elsevier] and the definitive version is available at: http://dx.doi.org/10.1016/j.msea.2011.04.029
Version: Accepted for publication
DOI: 10.1016/j.msea.2011.04.029
URI: https://dspace.lboro.ac.uk/2134/10978
Publisher Link: http://dx.doi.org/10.1016/j.msea.2011.04.029
ISSN: 0921-5093
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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