Extracting the operating thermal map and microstructural degradation gradient of a 25,000 h service-exposed CM88Y blade
Abstract
Abstract This study delivers the first spanwise microstructural and mechanical degradation map of a CM88Y nickel-based superalloy second-stage turbine blade after an unprecedented 25,000 h of real industrial service in a Zorya DU80 gas turbine, extending prior work limited to 18,000 h and to a single location. Four zones (Z1–Z3 airfoil, Z4 root baseline) were quantitatively compared via FESEM/EDS phase identification, ImageJ-based stereology, and Vickers microhardness mapping. Progressive MC-to-M₂₃C₆ carbide transformation and continuous grain-boundary film formation were most pronounced at Z1-LE and Z2-LE, which exhibited statistically comparable maximum carbide film thicknesses, accompanied by pronounced γ′ coarsening (182→262 nm) and volume-fraction increase (50.5%→68.1%), correlating with maximum microhardness softening (441.9→421.2 HV 0.3 ). A key methodological contribution is the reverse-engineered metal-temperature reconstruction using classical LSW theory and a volume-fraction-corrected Trans-Interface Diffusion-Controlled (TIDC) model, cross-validated through rigorous Gaussian error propagation, yielding a reconstructed surface thermal map (approximately spanning 572–693°C across the LSW and TIDC predictions with larger uncertainty in the lower-airfoil region) without embedded thermocouples. By combining multi-technique microstructural quantification, spatial interpolation, and inverse kinetic thermometry into a single diagnostic protocol, this work provides gas…
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