Accession Number:

AD0262901

Title:

THE DEVELOPMENT OF OPTIMUM MANUFACTURING METHODS FOR COLUMBIUM ALLWY FORGINGS

Descriptive Note:

Corporate Author:

CRUCIBLE STEEL CO OF AMERICA MIDLAND PA

Personal Author(s):

Report Date:

1961-08-01

Pagination or Media Count:

1.0

Abstract:

OF THE FOUR ALLOYS EVALUATED, F48 Cb-15W-5Mo1Zr, Cb74 Cb-10W-5Zr, D41 Cb-20W-10Ti-6Mo and D31 Cb-10Ti-10Mo, alloy Cb74 offers the best combination of hot strength, ductility and forgeability for the production of closed die forgings. Good quality extrusions were made at 2200-2300 F from ingots of the four alloys which had been canned in mild steel. Upset forging tests were made on annealed pieces of the extrusions at three temperatures using 50 upset in one heat and 75 upset in two heats. In summary, alloy Cb74 was best. Shortcomings of other alloys were D31 -- lowest hot strength, D41 -shallow forging cracks, room temperature brittleness, low hot strength, F48 -- slight forging cracks from the lower temperatures, low ductilility as annealed though considerably improved by 1400 F vacuum anneal. Oxidation resistance comparisons varied widely between alloys depending on temperature, all need coatings. An advantage for F48 was appreciably higher hot strength. Stress rupture strength in range 2000-2600 F was 50 higher than for Cb74. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE