TY - GEN
T1 - Interaction of the precipitation kinetics of δ and γ' phases in nickel-base superalloy ATI Allvac® 718Plus™
AU - Radis, Rene
AU - Zickler, Gerald A.
AU - Stockinger, Martin
AU - Sommitsch, Christof
AU - Kozeschnik, Ernst
PY - 2010/2/9
Y1 - 2010/2/9
N2 - In this paper, the precipitation behaviour of δ (Ni 3(Nb,Al)) and γ' (Ni3(Al,Ti,Nb)) phases in the nickel-base superalloy ATI Allvac® 718Plus™, 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 δ as well as γ' precipitates are presented. Using these modified interfacial energies, the calculated results show excellent agreement with the experimental measurements.
AB - In this paper, the precipitation behaviour of δ (Ni 3(Nb,Al)) and γ' (Ni3(Al,Ti,Nb)) phases in the nickel-base superalloy ATI Allvac® 718Plus™, 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 δ as well as γ' precipitates are presented. Using these modified interfacial energies, the calculated results show excellent agreement with the experimental measurements.
KW - ATI Allvac® 718Plus™
KW - Delta
KW - Gamma prime
KW - Precipitation kinetics
KW - Superalloy
UR - http://www.scopus.com/inward/record.url?scp=75849154501&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.638-642.2712
DO - 10.4028/www.scientific.net/MSF.638-642.2712
M3 - Conference paper
AN - SCOPUS:75849154501
SN - 0878492941
SN - 9780878492947
T3 - Materials Science Forum
SP - 2712
EP - 2717
BT - THERMEC 2009
T2 - 6th International Conference on Processing and Manufacturing of Advanced Materials
Y2 - 25 August 2009 through 29 August 2009
ER -