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  CM-247 LC
For turbine blades and vanes.

 

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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 247 LC is a derivative of MAR M 247 composition, primarily designed for directionally solidified (DS) turbine blade and vane applications. The modified alloy is a development of Cannon Muskegon Corporation.

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Engineering Characteristics

Beyond the DS experience, fine grained integral wheel casting application has ensued. Besides the advantages the alloy provides to castability and ductility, it also achieves approximately half the MAR M 247 crack growth rate of the similarly fine grain processed MAR M 247 alloy.

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Applications

The exceptional castability of CM 247 LC has resulted in its selection for conventionally cast vanes, nozzles and structural turbine components for aero and industrial gas turbines.

Extensive industrial turbine applications for DS blade and vane components have developed in CM247 LC where natural gas is used a fuel.

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Alloy Features

bulletDensity 0.308 lb./dm3 (8.54 kg/dm3).
bulletExceptional DS castability, in particular, resistance to grain boundary cracking during DS casting, complex cored, thin wall turbine airfoils.
bulletApproximately 50% greater tensile ductility advantage over MAR M 247 due to its more favorable carbide microstructure.
bulletReadily solution heat-treatable using multi-step treatments. Full solutioning of the ý and extensive y/ ý euectic solutioning results in an 11°C (20°F ) DS longitudinal stress-rupture property advantage over DS MAR M 247 and a 19°C (35°F ) advantage over MAR M 002.
bulletMinimum DS transverse tensile-ductility (full heat treated including full solutioning) typically 4%.
bulletImproved carbide stability compared to MAR M 247 -- much less susceptible to M6C platelet formation following solution treatment and high temperature turbine service exposure as well as brazing and diffusion bonding.

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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 247 LC® alloy is a registered trademark of Cannon-Muskegon Corporation.
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