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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Interaction of the Precipitation Kinetics of δ And...

Interaction of the Precipitation Kinetics of δ And γ’ Phases in Nickel-Base Superalloy ATI Allvac® 718Plus^TM

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Abstract:

In this paper, the precipitation behaviour of  (Ni3(Nb,Al)) and ’ (Ni3(Al,Ti,Nb)) phases in the nickel-base superalloy ATI Allvac® 718PlusTM, as well as their kinetic interactions are discussed. Important parameters such as volume fraction, mean radius and number density of precipitates are experimentally determined and numerically simulated as a function of the heat treatment parameters time and temperature. To match the experimentally observed kinetics, the predicted interfacial energy of the precipitates, as calculated for a sharp, planar phase boundary, is adjusted to take into account the interfacial curvature and entropic effects of a diffuse interface. Correction functions for the interfacial energies of  as well as ’ precipitates are presented. Using these modified interfacial energies, the calculated results show excellent agreement with the experimental measurements.

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THERMEC 2009

Info:

Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

2712-2717

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.2712

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Cite this paper

Online since:

January 2010

Authors:

Rene Radis, Gerald A. Zickler, Martin Stockinger, Christof Sommitsch, Ernst Kozeschnik

Keywords:

ATI Allvac® 718Plus^TM, Delta, Gamma Prime, Precipitation Kinetics, Superalloy

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