SNECMA EXPERIENCE WITH
COST EFFECTIVE DS AIRFOIL TECHNOLOGY
APPLIED USING CM 186 LC® ALLOY
F. Caruel, S. Bourguignon, B.
Lallement, S. Fargeas, A. DeBussac
SNECMA
Gennevilliers and Evry, France
K. Harris, G.L. Erickson, J.B. Wahl
Cannon-Muskegon Corporation
[SPS Technologies, Inc.]
Muskegon, Michigan U.S.A.
ABSTRACT
From a cost point of view SNECMA has
found DS columnar grain manufacturing technology to be highly attractive
compared to single crystal. CM 186 LC alloy exhibits enhanced mechanical
and environmental properties and temperature capability compared to MAR
M 200 Hf alloy; these properties are close to first generation single
crystal alloys up to 982°C (1800°F). The alloy is shown to be amenable
to various coating and brazing high temperature processes. The longer
term creep-rupture/phase stability data base on the alloy has now been
extended out to 8300 hours at 1038°C (1900°F). Castings for
engine test have been produced using CM 186 LC alloy.
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