Accession Number : AD0285316

Title :   TANTALUM EXTRUSION PROGRAM

Corporate Author : WAH CHANG CORP ALBANY OREG

Personal Author(s) : MCNABB,M.D.

Report Date : 25 JUN 1962

Pagination or Media Count : 1

Abstract : IT WAS DEMONSTRATED THAT, ALTHOUGH EXTRUSION PRESSURES GENERALLY EXCEED THE NORMALLY RECOMMENDED LEVEL OF 180,000 PSI, A T section of target dimensions can be extruded at 3200 F within the stress limitations of the extrusion tooling used on this project. The use of a molybdenum nose on one Ta-10W billet reduced upset pressure. A modification in lubrication technique, namely applying glass after heating the billet, and greater attention to die coating quality, resulted in improved extrusion surfaces. The presence of longitudinal striations on the better extrusions is indicative of localized die coating wear and further improvements are required in heating and lubrication practice to eliminate such defects. When extruding at 3200 F, the degree of recrystallization varies with extrusion ratio and position along the length of the extrusion. At 18.8:1 the degree of recrystallization increases from the nose to the tail of the extrusion. (Author)

Descriptors :   *EXTRUSION, *TANTALUM, *TANTALUM ALLOYS, *TUNGSTEN ALLOYS, ALLOYS, CERAMIC COATINGS, COATINGS, DESIGN, DIES, DIOXIDES, ELECTRON BEAMS, HEATING, LUBRICATION, MACHINING, MATERIALS, METALS, MICROPHOTOGRAPHY, MICROSTRUCTURE, PROCESSING, STEEL, SURFACE PROPERTIES, SURFACES, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE