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 creeprupture/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.

Issue Section:
Manufacturing, Materials, and Metallurgy
Topics:
Airfoils, Alloys, Crystals, Brazing, Coating processes, Coatings, Databases, Engines, High temperature, Manufacturing technology, Stability, Temperature
1.
Ross, E. W., and O’Hara, K. S., “Rene´ 142: A High Strength, Oxidation Resistant DS Turbine Airfoil Alloy,” Superalloys, 1992.
2.
Cetel, A. D., and Duhl, D. N., “Second Generation Columnar Grain Nickel Base Superalloy,” Superalloys, 1992.
3.
Harris, K., Erickson, G. L., Sikkenga, S. L., Brentnall, W. D., Aurrecoechea, J. M., and Kubaryck, K. G., “Development of the Rhenium Containing Super-alloys CMSX-4 and CM 186 LC for Single Crystal Blade and Directionally Solidified Vane Application in Advanced Turbine Engines,” Superalloys, 1992.
4.
Holt, R. T., and Wallace, W., “Impurities and Trace Elements in Nickel-Base Superalloys,” International Metal Review, Mar. 1976.
5.
Harris, K., Erickson, G. L., and Schwer, R. E., “MAR M 247 Derivations—CM 247 LC DC Alloy, CMSX Single Crystal Alloys, Properties and Performance,” Proc. 5th Symposium on Superalloys, Seven Springs, 1984.
6.
Erickson, G. L., Harris, K., and Schwer, R. E., “DS CM 247 LC-Optimized Mechanical Properties Resulting From Extensive γ’ Solutioning,” ASME Paper No. 85-GT-107, 1985.
7.
Harris, K., Erickson, G. L., and Schwer, R. E., “CMSX Single Crystal, CM DS and Integral Wheel Alloys and Performance,” Proc. High Temperature Alloys for Gas Turbines and Other Applications, Lie`ge, 1986.
This content is only available via PDF.
Copyright © 1998
 by The American Society of Mechanical Engineers
You do not currently have access to this content.