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  CM 186 LC
Outstanding castibility in a DS alloy.

 

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CMSX Single Crystal Alloys

CMSX -2/3
CMSX-4
CMSX -10
CM 186 LC
CM-247 LC
CMSX-486

Product Information Sheet Contents:

bullet 
 Product Summary
bullet 
 Engineering Characteristics
bullet 
 Applications
bullet 
 Alloy Features
bullet 
 Information Request Form

Product Summary

CM 186 LC alloy, a second generation Re-containing directionally solidified (DS), columnar grain superalloy, was developed with both component producibility and economic objectives particularly in mind. As vane component design trends toward increasing complex cooling configurations -- with thin walls [.020" (.5mm)], large overhanging integral shrouds and wide chord 3-d computer design airfoils -- they can be difficult and expensive to manufacture as single crystals (SX), due to problems arising with grain and recrystalization. For this reason, many turbine designers consider high strength DS alloys a viable alternative to SX. An alloy, castibility, therefore, becomes crucial to manufacturing success. To this end, the CM 186 LC Ds castibility is confirmed to be outstanding. Since the alloy is used in the as-cast and double-aged condition, recrystalization concerns are significantly reduced as well as associated process costs.

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Engineering Characteristics

The CM 186 LC alloy from Cannon Muskegon develops DS longitudinal creep-rupture properties equivalent to first generation single crystal alloys CMSX-2® and CMSX-3® up to 1800°F (982°C). Strength at higher temperatures lies between CMSX-2/3 alloys and the solution treated DS alloy CM 247 LC®. CM 186 LC alloy can be manufactured from virgin CMSX -2, -3 or -4 alloy foundry revert blends thereby favorably impacting cost of manufacture.CM 186 LC alloy has been successfully scaled to 8000 lb. (3630 kg) production size heats.

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Applications

The alloy is in field application for DS turbine blades for the EGT (Alstrom) industrial engine. The alloy is also in flight engine service as both DS and single crystal vane segments.

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Alloy Features

bulletDensity 0.314 lbs./cu in (8.70 kg/dm3).
bulletExcellent DS Castibility. Above average resistance to grain boundary cracking in complex cored, thin wall turbine airfoils.
bullet Oxidation, Type 1 hot corrosion (sulphidation) and coating performance as measured through cyclic burner rig testing, is similar to MAR M 247 alloy.
bulletGood DS transverse stress-rupture ductility is maintained through all temperature extremes, even in the normal ductility trough region for this category material.
bulletSatisfactory phase stability following 13,400 hr. stressed exposure at 1800°F (982°C) and 5000 hr. stressed exposure at 2000°F (1093°C) is apparent.

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Information Request Form

Please use the following form to request additional information on this, or another product. Be sure to include your full mailing address as the information will mailed to you.

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Copyright © 1999, 2004 The C-M Group. Specialty Material and Alloys Group. All rights reserved. Information in this document is subject to change without notice. Other products and companies referred to herein are trademarks or registered trademarks of their respective companies or mark holders. CM 816 LC® alloy is a registered trademark of Cannon-Muskegon Corporation.
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