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|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.
|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|
|Publisher Link: ||http://dx.doi.org/10.1179/174328408X355415|
|Appears in Collections:||Published Articles (Materials)|
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