Analysis of phase transformations in Inconel 738C alloy after regenerative heat treatment

[摘要] Study is based on the characterization of the chemical composition the phase transformations in Inconel 738C gas turbine blade after standard regenerative heat treatment. The microstructure and chemical composition were examined by scanning electron microscope and transmission electron microscope equipped with an energy dispersive X-ray spectrometer. It was found the degradation of microstructure of the blade feather. Redistribution of the chemical elements decreasing the corrosion resistance was observed inside the blade feather. The carbide transformation and sigma phase were found in the structure of the blade feather. It is found that the standard regenerative heat treatment of the IN738 operative gas turbine blade does not effect on carbides transformation, TCP σ-phase dissolution, and thus do not guarantee the full recovery of the IN738 gas turbine blade.

[发布机构] Institute of Metal Physics, Russian Academy of Sciences, Ekaterinburg, Russia^1;Ural Federal University, Ekaterinburg, Russia^2

[效力级别] 材料科学

[关键词] Carbide transformation;Carbides transformation;Chemical compositions;Energy dispersive x-ray spectrometers;Gas turbine blades;Inconel;Sigma phase