Application of Rapidly Solidified Superalloys.
Quarterly rept. 1 Nov 77-31 Jan 78,
PRATT AND WHITNEY AIRCRAFT GROUP WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
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This program is being conducted for the purpose of applying the principle of rapid solidification to superalloy powders and subsequent development of a stronger alloy composition for jet engine turbine airfoils. Centrifugal atomization and forced convective cooling are being used to produce the fast-cooled material. During this report period, alloy iterations of the conventional and Ni-Al-Mo series were conducted further work was conducted on phase thermal stability, grain orientation features, and forgeability. Creep-rupture testing continued with major results showing that Ta additions to Ni-Al-Mo alloys promote a stable phase dispersion up to the temperatures of gamma dissolution and early indications suggest that significant creep resistance is derived by the evolved Ni-Al-Mo-Ta microstructures.
- Properties of Metals and Alloys
- Fabrication Metallurgy