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Effect of the heat treatment on the microstructural evolution of the Nickel based superlloy

Auteurs : Mohamed Retima, Bouyegh Saida, Hacène Chadli
Année : 2011
Domaine : Sciences des matériaux
Type : Publication
Revue : Metalurgija-MJom
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : superalloy; heat treatment;, SEM and TEM; γ' particles; carbides .

Résumé :

The effect of heat treatment on the microstructure of cobalt-rich nickel based superalloy was studied applying scanning electron microscopy (SEM) and transmission electron microscopy (TEM).  The aim of the present work was to investigate the formation and evolution of different phases during the heat treatment of superalloy similar to Udimet 500. The presence of a relatively high volume fraction of γ’ particles in the γ matrix suggests on inefficient cooling rate during oil quenching from 1150°C. Carbides such as MC primary carbides of the type TiC and MoC as well as secondary carbides M23C6 (Cr23C6) were found in grains and at grain boundaries.