Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-271 - C7-276
DOI http://dx.doi.org/10.1051/jp4:1993743
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-271-C7-276

DOI: 10.1051/jp4:1993743

Precipitation kinetics in N18 P/M superalloy : experimental study and numerical modelling

N. GAYRAUD1, F. MORET1, X. BAILLIN1 and P.E. MOSSER2

1  CEREM/Laboratoire de Génie des Matériaux, CENG - 85X 38041 Grenoble cedex, France
2  SNECMA, 291 av. d'Argenteuil, 92230 Gennevilliers, France


Abstract
Heat treatments of aeronautical turbine disks produced by powder metallurgy include γ' solutionning, quenching and subsequent annealing. In the present work, the intragranular γ' precipitation kinetics during the quench has been followed by dilatometry and transmission electron microscopy. The precipitation steps are studied on specimens "hyperquenched" from selected temperatures during a simulated industrial quench. Experimental results are compared with a pseudo-binary model based on classical homogeneous nucleation and coarsening theories. While the precipitate volume fraction is lower than 20%, a good quantitative agreement is observed.



© EDP Sciences 1993