Creep behavior of plasma sprayed NiCr and NiCrAl coating-based systems

doi:10.11890/1006-7191-113-183

Abstract

Abstract: The creep behavior of the plasma sprayed NiCr and NiCrAl coating/Nickel alloy 690 substrate systems at 1033 K was investigated. Results showed that there was almost no difference in the creep lives between the NiCr and NiCrAl coated specimens at a given stress level, since the contents of Cr used in the NiCr and NiCrAl powders are almost same. The relationship between the minimum creep rate and the applied stress followed the well-known Norton's power law, ε_min=Aσⁿ, with the values of A=2.66×10^-16MPa^-n•h^-1 and n=6.48. The relation between the applied stress and time to rupture of the coated specimens can be estimated by using Larson-Miller equation. The θ projection method can be used to accurately characterize the creep behavior of the coated specimens.

Key words: Creep, Coating, θ projection method, Minimum creep strain rate

Xiancheng ZHANG, Changjun LIU, Fuzhen XUAN, Zhengdong WANG,Shan-Tung TU. Creep behavior of plasma sprayed NiCr and NiCrAl coating-based systems[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(3): 183-189.

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