Cooling Rate Dependent Morphology of the γ' Precipitates in Nickel-Base Superalloy Udimet 500

Mohammad Khalili Savadkoohi; Ahad Samadi; Rasoul Salehi

doi:10.4028/www.scientific.net/AMR.278.108

Paper Titles

A Review of the Measurement of Single Crystal Orientation Parameters of Nickel Castings
p.84

Some Deformation Micromechanisms in Ni-Based Superalloys Evidenced Using TEM In Situ Experiments
p.90

Effect of the Particle Size of γ’ Phase on the Mechanical Properties of Ni Base Superalloy
p.96

Characterization of Residual Stresses in 718 Turbine Discs by Neutron Diffraction and Finite Element Modelling
p.102

Cooling Rate Dependent Morphology of the γ' Precipitates in Nickel-Base Superalloy Udimet 500
p.108

Influence of Crystal Orientation on the Freckle Formation in Directionally Solidified Superalloys
p.114

The Microstructure Changes in IN713LC during the Creep Exposure
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Effect of Elastic Driving Force on the Evolution of Microstructures in the Secondary Creep Stage
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Change in Microstructure at Grain Boundaries with Creep Deformation of Polycrystalline Nickel-Based Superalloy IN-100 at 1273K
p.132

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 278Cooling Rate Dependent Morphology of the γ'...

Cooling Rate Dependent Morphology of the γ' Precipitates in Nickel-Base Superalloy Udimet 500

Abstract:

The morphology of the γ΄ precipitates during continues cooling of a nickel-base superalloy, Udimet 500, was studied using scanning electron microscopy and X-ray diffraction technique. The samples were full solutioned at 1200oC and then were cooled to ambient temperature under different cooling rates, 15, 1, 0.2, 0.05oC/min and air cooling. The unconstrained γ-γ΄ misfit values for each sample were calculated using the electrolytic extracted γ΄ precipitates. According to the results, by decreasing the cooling rate, not only the size, volume fraction and interparticle spaces of the  precipitates were increased, but also depending on the γ-γ΄ lattice misfits the corresponding  morphology was changed from spherical to cubic, then ﬂower-like and finally dendritic shape. The observations are discussed in view of the compositional changes of γ/γ΄ phases and elastic strain considerations of their interfaces which will be described in detail in the article.

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Periodical:

Advanced Materials Research (Volume 278)

Pages:

108-113

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.278.108

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Online since:

July 2011

Authors:

Mohammad Khalili Savadkoohi, Ahad Samadi, Rasoul Salehi

Keywords:

Constrained, Elastic Strain, Electrolytic Extraction, Morpholoy, Unconstrained, γ' Precipitation

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