Study of the structure and chemical composition of the protective coating of a fist stage gas turbine blade after regenerative heat treatment

International Conference "Modern Technologies and Materials of New Generations"

Davidov, D.I.^1 ; Kazantseva, N.V.^1 ; Vinogradova, N.I.^1 ; Ezhov, I.V.^1

M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskaya Street, 18, Ekaterinburg

620137, Russia^1

关键词: Carbide transformation;    Chemical compositions;    Gas turbine blades;    Sigma phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/286/1/012007/pdf
DOI  :  10.1088/1757-899X/286/1/012007

来源: IOP

【 摘 要 】

Investigation of the structure and chemical composition of the protective coating of the first stage IN738 gas turbine blade after standard regenerative heat treatment was done. It was found the degradation of microstructure and chemical composition of both the blade feather and its protective coating. Redistribution of the chemical elements decreasing the corrosion resistance was observed inside the protective coating. Cracks on the boundary between the blade feather and the protective coating were found by scanning electron microscopy. The carbide transformation and sigma phase were found in the structure of the blade feather. Based upon the structural and chemical composition studies, it is concluded that the standard regenerative heat treatment of the IN738 operative gas turbine blade does not provide full structure regeneration.