The Influence of Surface Shot Peening on the Isothermal Oxidation Behavior of NiCrAlYSi Coating

doi:10.11900/0412.1961.2020.00353

Acta Metall Sin

2021, Vol. 57

Issue (5): 684-692 DOI: 10.11900/0412.1961.2020.00353

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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.

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Abstract

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.

Key words: NiCrAlYSi coating vacuum arc ion plating shot peening isothermal oxidation thermally grown oxide (TGO) layer

Received: 08 September 2020

ZTFLH:

TG174.44

Fund: Young Elite Scientists Sponsorship Program of China Association for Science and Technology(2019-2021QNRC001)

About author: HE Limin, professor, Tel: (010)62497266, E-mail: he_limin@sohu.com

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	Guanxi LIU
	Guanghong HUANG
	Xuekun LUO
	Zaoyu SHEN
	Limin HE
	Jianping LI
	Rende MU

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00353 OR https://www.ams.org.cn/EN/Y2021/V57/I5/684

Table 1 Nominal compositions of IC10 superalloy and NiCrAlYSi coating

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)

Table 3 Mass changes of NiCrAlYSi coating sample after shot peening

Fig.3 Weight gain curves of 1050^oC 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 1050^oC

Fig.5 SEM image and EDS mapping of NiCrAlYSi coating (sample P-1) after 200 h isothermal oxidation at 1050^oC

Fig.6 Cross-sectional SEM images of NiCrAlYSi coating after 1000 h isothermal oxidation at 1050^oC

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 (k_p—rate constant) (b)

Fig.8 Schematic of 1050^oC isothermal oxidation and TGO layer growth of NiCrAlYSi coating

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