Accession Number : AD0482684

Title :   MANUFACTURING PROCESS DEVELOPMENT FOR ROLLING CAST SLABS OF COLUMBIUM (CB-752) ALLOY.

Descriptive Note : Final rept. 1 Jun 64-31 Jan 66,

Corporate Author : UNION CARBIDE CORP KOKOMO IN STELLITE DIV

Personal Author(s) : Pridgeon, John W. ; Schussler, Mortimer

Report Date : FEB 1966

Pagination or Media Count : 175

Abstract : Slab castings of HAYNES alloy Nb-752 (Nb-10W-2.5Zr) were made by the centrifugal skull casting and the electron-beam melting and casting techniques. The cast slabs were 2 to 3 inches thick by 8 to 12 inches wide by 17 to 70 inches long. Material produced by both casting methods was evaluated for chemistry, microstructure, macrostructure, homogeneity, soundness, and fabricability of the slabs to thin gage sheets. Rolling practices were established for making 0.020- and 0.30-inch thick sheet from the cast slabs made by both processes. Little or no difference could be seen between the fabricability of slabs made either by the centrifugal skull casting process or by the electron-beam melting and casting process. The sheet produced in the investigation was evaluated extensively for tensile properties at room and elevated temperatures, transverse bend properties, and Olsen cup properties. Also, the flatness, thickness variation and surface finish were determined on each sheet. The overall recovery of sheet from the starting feed material and from the machined cast slabs also was computed. (Author)

Descriptors :   (*NIOBIUM ALLOYS, MANUFACTURING), ROLLING(METALLURGY), CASTING ALLOYS, ELECTRON BEAM WELDING, MICROSTRUCTURE, MELTING, CASTING, TEMPERATURE, THICKNESS, SHEETS, CENTRIFUGAL CASTING, TENSILE PROPERTIES, BENDING.

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE