Transient oxide phases and scale strain in MCrAlY: a light scattering study.

摘要

We have used Raman 'fingerprinting' to investigate the temperature dependence of the transient oxide phases in the scale formed on MCrAl and MCrAlY (M=Ni,Co) in the temperature range 300 to 1200 C. In particular, by extending our Raman spectra to include second order scattering, we are able to track the evolution of NiO in the scales. We find that the inclusion of Y, while improving scale adhesion, inhibits the formation of Co oxide. We have also exploited the strain dependence of ruby fluorescence to extract the residual strain in the oxide scale.