SINGLE-CRYSTAL SUPERALLOYS FOR TURBINE-BL ADES IN ADVANCED AEROENGINES

Authors
Citation
T. Khan, SINGLE-CRYSTAL SUPERALLOYS FOR TURBINE-BL ADES IN ADVANCED AEROENGINES, Revue de métallurgie, 90(5), 1993, pp. 659-673
Citations number
34
Categorie Soggetti
Metallurgy & Mining
Journal title
Revue de métallurgie
ISSN journal
00351563 → ACNP
Volume
90
Issue
5
Year of publication
1993
Pages
659 - 673
Database
ISI
SICI code
Abstract
Nickel-base superalloys making it possible to realize monocrystalline parts with complex shapes, molded to dimension, are already used in ce rtain advanced motors in the United States and France Several monocrys talline superalloys have already been developed in France for the spec ific needs of French motor mechanics in order to ensure their technica l and commercial independence, Some important considerations and guide lines of the development of these alloys are examined role of heat tr eatments and optimal creep resistance obtained with relatively large p recipitates (about 0.5 mum), solidification under high temperature gra dient especially useful for reducing the porosity harmful to fatigue r esistance of these alloys. The HIP treatment is an interesting techniq ue for eliminating the porosity of monocrystals produced under low gra dient in solidification installations. The effect of crystalline aniso tropy in creep with respect to the microstructure and fatigue is exami ned.