Single crystal turbine blade and vane airfoils have extensively replace equiaxed and DS components in turbine engines. This activity is stimulated by the increased temperature/stress capability and superior thermal and cyclic fatigue properties typically achieved with single crystal components. Single crystal airfoils help achieve improved turbine efficiency and performance without sacrificing durability and can lower life cycle costs.
CMSX-2® is a single crystal alloy development of the Cannon Muskegon Corporation which achieves an attractive balance of necessary properties. It was the first single crystal alloy developed to have a combination of good single crystal castability, a wide solution heat treatment “window, ” phase stability and excellent oxidation properties. CMSX-3® alloy originally developed for Garrett, is CMSX-2 alloy with a 0.1% Hf addition. Both alloys have essentially the same properties, however a slightly lower solution temperature for CMSX-3 alloy is employed.
CMSX-2 and CMSX-3 alloys are production status materials. Many 800 lb. (3630 kg) V-3 furnace heats have been melted to date and 15 years of experience with CMSX-2 and CMSX-3 alloys — vis-á-vis, alloy melting, single crystal casting [fifteen (15) different casting processes/sources used], solution heat treatment, mechanical and environmental property response and turbine engine experience — support the following alloy listed below.
Numerous very successful turbine applications for CMSX-2 and CMSX-3 are in effect worldwide.
|Density 0.309 lb./ cu in. (8.56 kg/dm3).|
|Good single crystal castability when cast with moderate to high thermal gradient industrial processes.|
|Wide solution heat treatment “window” of 49°F (27°C).|
|Superior resistence to recrystalization on solution treatment.|
|45°F (25°C) to 905°F (50°C) creep capability improvement over the widely used DS MAR M 200 Hf alloy.|
|Excellent phasial stability.|
|Excellent bare coated oxidation resistance (see graph).|
|Hot corrosion resistance (uncoated, bare) very much closer to IN 792 than IN 100 equiaxed.|
|Numerous fatigue [1922°F (1050°C) max – 212°F (100°C)min] 10x advantage over equiaxed IN 100.|
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