Accession Number : ADA139198

Title :   Application of Rapidly Solidified Superalloys.

Descriptive Note : Quarterly rept. 1 May-31 Jul 76,


Personal Author(s) : Cox,A R

PDF Url : ADA139198

Report Date : Aug 1976

Pagination or Media Count : 28

Abstract : 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 convective cooling of the material are bineg used for producing the fast cooled material. During this report period, high speed operation of the atomizer was achieved with resultant high yields of superalloy powder. Metallographic evaluation continued to show cooling rates in excess of 100,000 C/sec and also showed that the existence of a 'microcrystalline' structure in the rapidly quenched powder, as opposed t the classically dendritic form. This crystallite form appears as a more homogeneous structure with almost complete, if not total, secondary phase suppression within the crystallites. Four experimental lots of material were compacted and extruded for initiation of the heat treat and mechanical test program. The working operations proceeded without difficulty. (Author)

Descriptors :   *Superalloys, *Powder metallurgy, *Solidification, Quick reaction, Crystallization, Microstructure, Extrusion, Airfoils, Turbines, Jet engines, Centrifugal force, Atomization, Convection(Heat transfer), Cooling, Mechanical properties, Creep strength, Thermal stability, Grain structures(Metallurgy)

Subject Categories : Aircraft
      Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE