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

N. GAYRAUD; F. MORET; X. BAILLIN; P.E. MOSSER

doi:doi:10.1051/jp4:1993743

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		https://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.