SNECMA EXPERIENCE WITH COST-EFFECTIVE DS AIRFOIL TECHNOLOGY APPLIED USING CM-186 LC(R) ALLOY

From a cost point of view SNECMA has found DS columnar grain manufactu ring technology to be highly attractive compared to single crystal. CM 186 LC1 alloy exhibits enhanced mechanical and environmental properti es and temperature capability compared to MAR M-2 200 Hf alloy; these properties are close to first-generation single crystal alloys lip to 982 degrees C (1800 degrees F). The alloy is shown to be amenable to v arious coating and brazing high-temperature processes. The longer term creep-rupture/phnse stability data base on the alloy has now been ext ended out to 8300 hours at 1038 degrees C (1900 degrees F). Castings f or engine test have been produced using CM 186 LC alloy.