Accession Number : ADD014115

Title :   Method for Developing Ultrafine Microstructures in Titanium Alloy Castings.

Descriptive Note : Patent, Filed 4 Dec 87, patented 11 Apr 89,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

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

Report Date : 11 Apr 1989

Pagination or Media Count : 5

Abstract : A method for improving the microstructure of cast titanium alloy ar ticles which comprises the steps of hydrogenating the cast article at a temperature near or above the titanium-hydrogen eutectoid of 815 deg C. (of about 780 deg to 1020 deg 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 deg to 750 deg C., applying a vacuum to dehydrogenate the article, and cooling the thus-dehydrogenated article at a controlled rate. PAT-CL-148-133. (jes)

Descriptors :   *CASTING ALLOYS, *TITANIUM ALLOYS, CASTINGS, CONTROL, COOLING, HYDROGEN, MICROSTRUCTURE, RATES, ROOM TEMPERATURE, ULTRAFINES, VACUUM

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE