The Influence of Surface Shot Peening on the Isothermal Oxidation Behavior of NiCrAlYSi Coating
LIU Guanxi, HUANG Guanghong, LUO Xuekun, SHEN Zaoyu, HE Limin(), LI Jianping, MU Rende
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
Cite this article:
LIU Guanxi, HUANG Guanghong, LUO Xuekun, SHEN Zaoyu, HE Limin, LI Jianping, MU Rende. The Influence of Surface Shot Peening on the Isothermal Oxidation Behavior of NiCrAlYSi Coating. Acta Metall Sin, 2021, 57(5): 684-692.
Thermal barrier coatings (TBCs), which mainly comprise top and bond coats, have been applied to the hot components of gas turbine engines owing to their low thermal conductivity, high-temperature oxidation resistance, gas corrosion resistance, and so on. However, a thermally grown oxide (TGO) layer, which germinates between top and bond coats, has a considerable effect on the service life of TBCs. Moreover, the microstructure optimization and growth inhibition of a TGO layer are crucial. The surface modification of bond coat in TBCs has been introduced to reduce and optimize the growth rate of a TGO layer. Among these methods, the surface shot peening of bond coat has yet to be extensively elucidated at high service temperatures. Furthermore, the influence of surface shot peening on isothermal oxidation behavior has rarely been reported in literature. In the present research, NiCrAlYSi coating was prepared using vacuum arc ion plating. The influence of the surface shot peening process on the isothermal oxidation behavior of NiCrAlYSi coating was investigated in detail, which indicated that the surface roughness of NiCrAlYSi coating reduced after the shot peeing. In this process, the compactness and smoothness of NiCrAlYSi coating improved, which could avoid the formation of an abnormal oxidation area in the coating due to the penetration and diffusion of oxygen atoms inside the coating. A uniform and low thickness deviation TGO layer could be generated at the surface. The TGO layer growth rate of NiCrAlYSi coating with 0.4 MPa and 5 min shot peening reduced by 60% compared to no shot peening, and the oxidation resistance of NiCrAlYSi coating improved.
Table 1 Nominal compositions of IC10 superalloy and NiCrAlYSi coating
Sample
Peen diameter
mm
Peen concentration
Pressure
MPa
Time
min
P-1
0.1
30%
0.2
5
P-2
0.1
30%
0.4
5
Table 2 Parameters of shot peening to NiCrAlYSi coating
Fig.1 Low (a, c, e) and high (b, d, f) magnified SEM images of NiCrAlYSi coating surfaces with different shot peening processes
Fig.2 Cross-sectional SEM images of NiCrAlYSi coating with different shot peening processes (Dash lines show the interfaces of NiCrAlYSi coating and IC10 matrix)
Sample
Mass before shot peening
Mass after shot peening
P-0
3.9422
-
P-1
3.9486
3.9480
P-2
3.9679
3.9676
Table 3 Mass changes of NiCrAlYSi coating sample after shot peening
Fig.3 Weight gain curves of 1050oC isothermal oxidation of NiCrAlYSi coating with different shot peening processes
Fig.4 Cross-sectional SEM images of NiCrAlYSi coating after 200 h (a, c, e) and 600 h (b, d, f) isothermal oxidation at 1050oC
Fig.5 SEM image and EDS mapping of NiCrAlYSi coating (sample P-1) after 200 h isothermal oxidation at 1050oC
Fig.6 Cross-sectional SEM images of NiCrAlYSi coating after 1000 h isothermal oxidation at 1050oC
Fig.7 Average thermally grown oxide (TGO) layer thicknesses as a function of oxidation time (Error bar represent the standard deviation values) (a) and parabolic fitting curves of TGO layer thickness (kp—rate constant) (b)
Fig.8 Schematic of 1050oC isothermal oxidation and TGO layer growth of NiCrAlYSi coating
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