期刊
MATERIALS SCIENCE AND TECHNOLOGY
卷 25, 期 2, 页码 287-299出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/174328408X355415
关键词
Superalloys; MCrAlY; Modelling; Diffusion; Oxidation; Coatings
资金
- EPSRC [GR/S86334/01]
- 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
- Siemens Industrial Turbomachinery Ltd
- NPL
- EPSRC [EP/F029748/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [GR/S86334/01, EP/F029748/1] Funding Source: researchfish
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 degrees 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.
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