Effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96

Ye-fei Feng; Xiao-ming Zhou; Jin-wen Zou; Gao-feng Tian

doi:10.1007/s12613-019-1756-2

Volume 26 Issue 4

Apr. 2019

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International Journal of Minerals, Metallurgy and Materials > 2019 > 26(4): 493-499. > DOI: 10.1007/s12613-019-1756-2

Ye-fei Feng, Xiao-ming Zhou, Jin-wen Zou, and Gao-feng Tian, Effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96, Int. J. Miner. Metall. Mater., 26(2019), No. 4, pp.493-499. https://dx.doi.org/10.1007/s12613-019-1756-2

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Research Article

Effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96

Author Affilications

Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

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This work was financially supported by the National Material Special Program of China (No. JPPT-F2008-5-1).

Received: 06 September 2018; Revised: 19 November 2018; Accepted: 01 January 2019;

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Abstract

Abstract

The effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96 was investigated. Three groups of samples were quenched continuously with three fixed cooling rates, respectively, then subjected to a creep test under a constant load of 690 MPa at 700℃. Clear differences in size of secondary γ' precipitates, creep properties and substructure of creep-tested samples were observed. The quantitative relationship among cooling rate, the size of secondary γ' precipitates, and steady creep rate was constructed. It was found that with increasing cooling rate, the size of secondary γ' precipitates decreases gradually, showing that the relationship between the size of secondary γ' precipitates and the cooling rate obeys a power law, with an exponent of about -0.6, and the creep rate of steady state follows a good parabola relationship with cooling γ' precipitate size. For 235℃/min, FGH96 alloy exhibited very small steady creep rate. The density of dislocation was low, and the isolated stacking fault was the dominant deformation mechanism. With decreasing cooling rates, the density of dislocation increased remarkably, and deformation microtwinning was the dominant deformation process. Detailed mechanisms for different cooling rate were discussed.
- quantitative relationship,
- cooling rate,
- secondary γ' precipitates,
- steady creep rate,
- deformation mechanism

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References (17)

References

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