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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/22115

Title: A multicomponent diffusion model for prediction of microstructural evolution in coated Ni based superalloy systems
Authors: Karunaratne, M.
Ogden, Sarah L.
Kenny, Steven D.
Thomson, Rachel C.
Keywords: Superalloys
Issue Date: 2009
Publisher: Maney (© Institute of Materials, Minerals and Mining)
Citation: KARUNARATNE, M. ... et al., 2009. A multicomponent diffusion model for prediction of microstructural evolution in coated Ni based superalloy systems. Materials Science and Technology, 25 (2), pp.287-299
Abstract: A multicomponent model which can simulate the microstructural evolution of a coated Ni based superalloy system has been developed. The model consists of a one-dimensional finite difference diffusion solver to calculate the component distribution, a power law based model for predicting surface oxidation and a thermodynamic calculation routine for determining the phase evolution. Apart from forecasting concentration and phase profiles after a given thermal history, the model can estimate the losses due to oxidation and the remaining life of a coating based on a concentration and/or phase fraction dependent failure criteria. The phase constitution and concentration profiles predicted by the model have been compared with an experimental NiCoCrAlY coated CMSX-4 system, aged for times up to 10 000 h between 850 and 1050°C, and many experimental features can be predicted successfully by the model. The model is expected to be useful for assessing microstructural evolution of coated turbine blade systems.
Description: This is an Accepted Manuscript of an article published by Taylor & Francis in Materials Science and Technology on 19/07/2013, available online: http://dx.doi.org/10.1179/174328408X355415
Sponsor: The authors would like to acknowledge the support of EPSRC through the Supergen 2 programme (GR/ S86334/01) and the following companies: Alstom Power Ltd, Chromalloy UK, E.ON UK, Alcoa Howmet Ltd, Doosan Babcock Energy Ltd, National Physical Laboratory (NPL), QinetiQ, Rolls-Royce plc, RWE npower, Sermatech Ltd and Siemens Industrial Turbomachinery Ltd for their valuable contributions to the project.
Version: Accepted for publication
DOI: 10.1179/174328408X355415
URI: https://dspace.lboro.ac.uk/2134/22115
Publisher Link: http://dx.doi.org/10.1179/174328408X355415
ISSN: 0267-0836
Appears in Collections:Published Articles (Materials)

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