N18, powder metallurgy superalloy for disks: Development and applications

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Journal of Materials Engineering and Performance; (United States)

DOI:https://doi.org/10.1007/BF02661740· OSTI ID:5448858

Guedou, J Y; Lautridou, J C; Honnorat, Y ^[1]

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1. SNECMA, Evry (France). Materials and Processes Dept.

The preliminary industrial development of a powder metallurgy (PM) superalloy, designated N18, for disk applications has been completed. This alloy exhibits good overall mechanical properties after appropriate processing of the material. These properties have been measured on both isothermally forged and extruded billets, as well as on specimens cut from actual parts. The temperature capability of the alloy is about 700 C for long-term applications and approximately 750 C for short-term use because of microstructural instability. Further improvements in creep and crack propagation properties, without significant reduction in tensile strength, are possible through appropriate thermomechanical processing, which results in a large controlled grain size. Spin pit tests on subscale disks have confirmed that the N18 alloy has a higher resistance than PM Astrology and is therefore an excellent alloy for modern turbine disk applications.

• OSTI ID: 5448858
• Journal Information: Journal of Materials Engineering and Performance; (United States), Vol. 2:4; ISSN 1059-9495
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HEAT RESISTING ALLOYS
FABRICATION
MECHANICAL PROPERTIES
MICROSTRUCTURE
AEROSPACE INDUSTRY
PRECIPITATION HARDENING
RESEARCH PROGRAMS
ALLOYS
HARDENING
HEAT RESISTANT MATERIALS
INDUSTRY
MATERIALS
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties