A multicomponent diffusion model for prediction of microstructural evolution in coated Ni based superalloy systems
journal contributionposted on 26.07.2016 by Mudith Karunaratne, Sarah L. Ogden, Steven Kenny, Rachel Thomson
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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.
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.
- Aeronautical, Automotive, Chemical and Materials Engineering