THE DEVELOPMENT OF OPTIMUM MANUFACTURING METHODS FOR COLUMBIUM ALLWY FORGINGS
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1961
- Accession Number
- AD0262901
Entities
People
- R.o. Carson