Accession Number : AD0620746

Title :   EFFECT OF MICROSTRUCTURE AND COOLING RATE ON THE MECHANICAL PROPERTIES OF TI-6AL-6V-2SN.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS

Personal Author(s) : Hickey,Charles F. ,Jr.

Report Date : JUL 1965

Pagination or Media Count : 18

Abstract : The investigation concerns the separate effects of microstructure and cooling rate on the mechanical properties of the titanium alloy 6Al-6V-2Sn. Microstructure was varied by forging a 6-inch-diameter bar to diameters of 4-, 2-, and 5/8-inch. Each bar was then tested in both the annealed and heat-treated conditions. The effect of cooling rate alone was obtained by trepanning sections of 4-, 2-, and 5/8-inch diameter from the 6-inch-diameter bar, heat treating and testing. Mechanical property data were obtained utilizing tensile and impact specimens which were machined from the bar or section diameters following the final treatment phase. Photomicrographs are shown for a typical area of each conditions. Results of the investigation show that working tends to refine the overall microstructure, whereas cooling rate is a determining factor on the structure of the matrix but has little or no effect on the primary alpha size. Both microstructure and cooling rate strongly influence the resultant mechanical properties of this alloy. Primary microstructure is the major contributing factor on ductility and impact while both primary microstructure and cooling rate influence the final strength properties. (Author)

Descriptors :   (*TITANIUM ALLOYS, MECHANICAL PROPERTIES), ALUMINUM ALLOYS, VANADIUM ALLOYS, TIN ALLOYS, MICROSTRUCTURE, COOLING, HEAT TREATMENT, HOT WORKING, MARTENSITE, DUCTILITY, SHOCK RESISTANCE

Distribution Statement : APPROVED FOR PUBLIC RELEASE