Application of Rapidly Solidified Superalloys.
Quarterly rept. 1 Feb-30 Apr 76,
PRATT AND WHITNEY AIRCRAFT GROUP WEST PALM BEACH FL
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This program is being conducted for the purpose of applying the principle of fast solidification to superalloy powders and subsequent development of stronger compositions for jet engine turbine airfoils. Centrifugal atomization and forced convection cooling of the material are being used for producing the fast cooled material. During this report period, conditions for stable operation of the device used for fast cooling were investigated, and material thus produced was evaluated with respect to the effect of fast cooling on microstructure. It was found that molten metal stream stability is a fundamental requirement for useful operation. High tangential velocities of the atomized metal are required for high yields of fast cooled powder. Cooling rates in excess of 10 100,000 Csec are attainable for IN100 alloy powder. IN100 alloy cooled at these rates exhibited a total suppression of the gamma phase and significant suppression of the primary carbide phase. Product quality commensurate with present quality standards for superalloy powder appears attainable. Author
- Properties of Metals and Alloys
- Jet and Gas Turbine Engines