Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 43A, Issue 2, Pages 774-788Publisher
SPRINGER
DOI: 10.1007/s11661-011-0897-3
Keywords
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Funding
- Energy Programme
- Research Councils UK cross-council initiative [GR/S86334/01, EP/F029748]
- NPL
- EPSRC [EP/F029748/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F029748/1] Funding Source: researchfish
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A multicomponent, one-dimensional diffusion model that was developed for simulating microstructure evolution in coated gas turbine blade systems has been used to compare the phase structures of three MCrAlY coated superalloy systems. The model is based on finite differences and incorporates oxidation and equilibrium thermodynamic computations. The superalloy substrates considered were the nickel-based superalloy CMSX-4, a high-Cr single-crystal superalloy, and a cobalt-based MAR-M509, and these were all coated with an MCrAlY bond coat of similar composition. The results predicted by the model have been compared with similar experimental systems. The model can predict many features observed experimentally and therefore can be expected to be a useful tool in lifetime prediction and microstructural assessment of turbine blade systems based on superalloys. The work also highlighted the fact that for a given coating, the phase evolution within system is dependent on the substrate material.
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