Evolution of residual stress distribution and microstructure in a platinum-aluminide coating

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Abstract

In the present paper, we consider the evolution of residual stress and the corresponding
microstructure in the thermally grown oxide (TGO) formed on a type of platinum-aluminide
coating, RT22, on a single crystal superalloy CMSX4. Eight coated specimens were oxidised in a
simulated gas turbine environment at 850, 950 and 1050uC for periods of time extended up to
10 000 h. Photostimulated luminescence piezo-spectroscopy (PLPS) was used to measure the
residual stress in the TGO in order to provide a detailed evaluation of the stress developed at
each temperature. The stress variation was evaluated using a random measurement approach,
which demonstrated that up to 100 measurements provide data that allows the stress distributions
to be determined with high confidence. Scanning electron microscope (SEM) and energy
dispersive X-ray (EDX) microanalysis have been adopted to investigate microstructural and
compositional changes in the TGO and the coating as a function of time and temperature. The
results are discussed with respect to the correlation between the statistically analysed stress
distribution, degradation of the TGO and coating overall integrity.
Original languageEnglish
Pages (from-to)797-803
Number of pages7
JournalMaterials Science and Technology
Volume29
Issue number7
DOIs
Publication statusPublished - 2013

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