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Association of Metallurgical Engineers of Serbia AMES

Scientific paper UDC: 669.245.057

EFFECT OF THE HEAT TREATMENT ON THE

MICROSTRUCTURAL EVOLUTION OF THE NICKEL BASED SUPERALLOY

Mohamed Retima*, Saida Bouyegh, Hacène Chadli

Laboratoire de Métallurgie et Génie des Matériaux Université Badji Mokhtar-Annaba, Algeria

Received 29.11.2010 Accepted 28.03.2011

Abstract

The effect of heat treatment on the microstructure of cobalt-rich nickel based supperalloy 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.

Key words: superalloy; heat treatment;, SEM and TEM; γ' particles; carbides

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