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A multicomponent diffusion model for prediction of microstructural evolution in coated Ni based superalloy systems

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journal contribution
posted on 26.07.2016 by Mudith Karunaratne, Sarah L. Ogden, Steven Kenny, Rachel Thomson
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.

Funding

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.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Materials Science and Technology

Volume

25

Issue

(2)

Pages

287 - 299

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

Publisher

Maney (© Institute of Materials, Minerals and Mining)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2009

Notes

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

ISSN

0267-0836

eISSN

1743-2847

Language

en

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