THE DEVELOPMENT OF OPTIMUM MANUFACTURING METHODS FOR COLUMBIUM ALLOY FORGINGS. Interim Technical Engineering Report, March 15, 1961-August 15, 1961

Technical Report · Tue Aug 01 04:00:00 EDT 1961

OSTI ID:4841706

Carson, R O

Of the four alloys evaluated, F48 (Cb-15W-5Mo- 1Zr), Cb74 (Cb- 1OW-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. The superior forgeability and better room temperature ductility of Cb74 more than compensate for its lower strength when compared to F48. Good quality extrusions were made at 2200-2300 deg F from ingots of the four alloys which had been canned in mild steel. Relatively high extrusion pressures were required except for D31 and the press stalled during the extrusion of one of the F48 ingots. 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. Subsequently, mechanical properties were determined. 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 ductility as annealed though considerably improved by 1400 deg 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 deg F was 50% higher than for Cb74. (auth)

• Research Organization: Crucible Steel Co. of America. Midland Research Lab., Penna.
• NSA Number: NSA-15-028029
• OSTI ID: 4841706
• Report Number(s): ASD-TR-7-782(V)
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANNEALING
BRITTLENESS
CANNING
CARBON STEELS
COATING
CRACKS
DIES
DUCTILITY
EFFICIENCY
EXTRUSION
FABRICATION
FORGING
HIGH TEMPERATURE
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
OXIDATION
PLANNING
PRESSURE
PRODUCTION
QUANTITATIVE ANALYSIS
RODS
STABILITY
STRESSES
TEMPERATURE
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN ALLOYS
VACUUM
ZIRCONIUM ALLOYS