Affiliation:
1. Laboratoire de Science et Génie des Matériaux Métalliques, Ecole des Mines, Nancy cédex 54042, France
Abstract
From the first forged turbine blades made of iron base alloys to the present nickel base single-grain
turbine blades and vanes manufactured by directional solidification, an enormous amount of research
has been directed to attaining the hottest possible combustion chamber temperatures in jet engines.
Temperature has been increased by about 15 K each year for the last two decades, improving the
thermodynamic efficiency of the engines. The more recent developments concern the manufacturing
of single-grain parts made of nickel base superalloys with large amount of the γ′ hardening phase.This paper first presents the directional solidification process used to produce single-grain parts, the
formation of as-cast microstructures and the defects that can arise during solidification. In the second
part the thermal treatments that are applied to the nickel base superalloys in order to enhance their
mechanical properties are detailed. The effect of crystallographic orientation and of the γ/γ′
microstructure on the mechanical properties is briefly presented, as well as the. microstructural
changes that can possibly arise during service.
Cited by
19 articles.
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