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- Title
A multicomponent diffusion model for prediction of microstructural evolution in coated Ni based superalloy systems.
- Authors
Karunaratne, M. S. A.; Ogden, S. L.; Kenny, S. D.; Thomson, R. C.
- 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.
- Subjects
MICROSTRUCTURE; HEAT resistant alloys; ALLOYS; OXIDATION; THERMODYNAMICS
- Publication
Materials Science & Technology, 2009, Vol 25, Issue 2, p287
- ISSN
0267-0836
- Publication type
Article
- DOI
10.1179/174328408X355415