As gas turbine designers attempt to improve engine efficiency by raising turbine temperatures and rotational speeds, engine components must endure increased stress and temperature extremes. CMSX-10® alloy form Cannon Muskegon Corporation represents a significant improvement in superalloy capability, and is currently one of the strongest Ni-based single crystal casting superalloys known to exist in the world. It provides an additional 30°C creep and fatigue strength advantage over the best alternatives, and alloys turbine engine hot section component exposure temperatures to be increased by at least 42°C (75°F).
CMSX-10® super alloy from Cannon Muskegon is balanced to provide an attractive blend of single-crystal component castability, heat treatability, impact strength, fatigue strength, and resistance to environmental degradation. In addition to many small VIM heats, Cannon Muskegon has produced several 3855 kg (8500lb) 100% virgin production heats, plus several 3855kg 50% virgin/50% revert production heats, establishing the superalloy features noted in the features section below.
CMSX-10® super alloy from Cannon Muskegon is under evaluation by Solar® Turbines for first stage turbine blading for their new 4.2 MW Mercury 50 industrial engine. Click here to read the story.
|Density 0.326 lb./in3 (9.05 kg/dm3).|
|CMSX-10 is VIM produced in a manner similar to other single crystal alloys. It exhibits good castibility, with foundry performance similar to that achieved with CMSX-4® second generation superalloy. Tight chemistry control leads to uniform casting yields and alloy properties, plus it maximizes “tramp elements” that can adversely affect casting yield by causing nucleation of grain defects.|
|CMSX-10 provides good resistance to recrystallization during the solution heat treatment cycle. The superalloy is capable of full ý solutioning (which is currently achieved with a peak soak temperature of about 2,490°F (1,366°C), and provides an adequate solution heat treatment window.|
|A three-step aging process results in formation of relatively fine ý matrix channels that provide additional resistance to dislocation movement, positively influencing tensile and creep strengths ranging at lower temperatures.|
|Tensile and impact strengths ranging from room temperature to about 1,050°C are similar to other Ni-based second generation alloys.|
|CMSX-10 provides an appropriate 30°C creep-rupture advantage relative to second generation SX superalloys such as CMSX-4.|
|On the basis of time to 1% creep deformation, CMSX-10 exhibits greater strength than CMSX-4 at all temperatures and stress conditions evaluated. Comparing time to 1% creep at 982°C and 248 Mpa, CMSX-10 demonstrates an advantage of 4.6 times that of CMSX-4 material. Additionally, engine tests with both CMSX-10 and CMSX-4 blades intermixed on a common blade-ring showed average CMSX-10 blade growth was 1/8th that of CMSX-4, for the particular engine cycle evaluated.|
|Data from both LCF and HCF tests relevant to turbine engine performance show that CMSX-10 has anywhere from similar to three times greater fatigue life than CMSX-4 superalloy.|
|Bare alloy oxidation resistance is good, with cyclic burner rig tests (Mach 1, 1,100°C, 0.25 ppm salt) showing that CMSX-10 is on par with CMSX-4 superalloy. However, at lower temperature exposure, it is not as good as CMSX-4.|
|Coatings/substrate compatibility is acceptable with aluminide coatings, and advanced platinum-aluminide test results are encouraging.|
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