TY  - JOUR
AU  - Galiullin, T.
AU  - Chyrkin, A.
AU  - Pillai, R.
AU  - Vassen, R.
AU  - Quadakkers, W. J.
TI  - Effect of alloying elements in Ni-base substrate material on interdiffusion processes in MCrAlY-coated systems
JO  - Surface and coatings technology
VL  - 350
SN  - 0257-8972
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2018-04902
SP  - 359 - 368
PY  - 2018
AB  - The effect of alloying elements in the substrate on the interdiffusion processes between a NiCoCrAlY-coating and model Ni-base superalloys was studied. Four single-crystal substrates Ni-10Cr-8Al-X (wt%, X = 10Co, 9Ta, 6 W) were coated with a conventional NiCoCrAlY-coating and exposed to air for up to 1000 h at 1050 °C. The microstructural analyses (LOM/SEM/EDX) revealed a strong dependence of the coating degradation rate on the substrate composition. The coating applied to the ternary base Ni-10Cr-8Al alloy and to the quaternary Co-containing substrate degraded most rapidly while the Ta addition to the substrate effectively suppressed interdiffusion. The degradation phenomena such as β-NiAl depletion and propagation of the secondary reaction zone (SRZ) were interpreted in terms of a thermodynamical analysis in Thermo-Calc and by using a CALPHAD-based thermodynamic-kinetic diffusion model.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000444660500034
DO  - DOI:10.1016/j.surfcoat.2018.07.020
UR  - https://juser.fz-juelich.de/record/851202
ER  -