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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 ZouEmail author
  • Gao-feng Tian
Article
  • 24 Downloads

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°C. 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°C/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.

Keywords

quantitative relationship cooling rate secondary γ′ precipitates steady creep rate deformation mechanism 

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Notes

Acknowlegement

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

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Ye-fei Feng
    • 1
  • Xiao-ming Zhou
    • 1
  • Jin-wen Zou
    • 1
    Email author
  • Gao-feng Tian
    • 1
  1. 1.Science and Technology on Advanced High Temperature Structural Materials LaboratoryBeijing Institute of Aeronautical MaterialsBeijingChina

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