Accession Number : ADD014067

Title :   Method for Refining Microstructures of Blended Elemental Titanium Powder Compacts.

Descriptive Note : Patent, Filed 4 Dec 87, patented 28 Feb 89,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Eylon, Daniel ; Froes, Francis H

Report Date : 28 Feb 1989

Pagination or Media Count : 6

Abstract : This invention relates to the processing of titanium articles fabricated by powder metallurgy to improve the microstructure of such articles. In general terms, powder metallurgy involves production, processing and consolidation of fine particles to produce a solid article. The small, homogeneous powder particles result in a uniform microstructure in the final product. If the final product is made net-shape by application of hot isostatic pressing (HIP), a lack of texture can result, thus giving equal properties in all directions. In accordance with the present invention there is provided a process for improving the microstructure of a blended elemental titanium article made by powder metallurgy which comprises, in combination, the steps of hydrogenating the compacted article at a temperature of about 780 to 1020 C to a hydrogen level of about 0.50 to 1.50 weight percent, cooling the thus-hydrogenated article to room temperature at a controlled rate, heating the thus-cooled, hydrogenated article to a temperature of about 650 to 750 C. and applying a vacuum to dehydrogenate the article, and cooling the thus-hydrogenated article to room temperature at a controlled rate. Keywords: Patents. (aw)

Descriptors :   *MICROSTRUCTURE, *PATENTS, *POWDER METALLURGY, *REFINING, *TITANIUM, *COMPACTING, CONTROL, COOLING, HOT PRESSING, HYDROGEN, ISOSTATIC PRESSING, PARTICLE SIZE, PARTICLES, PRODUCTION, RATES, ROOM TEMPERATURE, SOLIDS, VACUUM, HYDROGENATION, DEHYDROGENATION

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE