THE DEVELOPMENT OF OPTIMUM MANUFACTURING METHODS FOR COLUMBIUM ALLOY SHEET. Interim Technical Engineering Report, March 15, 1961-July 31, 1961
Technical Report
·
OSTI ID:4837618
F48 niobium alloy sheet processed from various locations of an 8-in. diameter electron beam melt plus vacuum arc remelt ingot had good properties and excellent uniformity between ingot locations. Elevated temperature tensile strength and stress rupture properties were comparable to results previously reported for higher oxygen double vacuum arc melted material. Another 8-in. diameter F48 ingot was cast and forged to 1 3/4-in. thick slab, and a small portion of the slab was lab processed to sheet. Room temperature properties were comparable to those obtained in the within-ingot uniformity study above. Elevated temperature strength was significantly higher, probably due to a higher molybdenum content. Test procedures are described in some detail. Testing speed was found to be an important factor in bend testing. A laboratory rolling program is being conducted on the F48 alloy to determine optimum sheet processing techniques. It appears that temperatures of at least 2500F are required for sheet bar rolling. Two 8-ln. diameter D31 ingots were cast by the electron beam melt plus vacuum arc remelt technique. These ingots will be evaluated to determine uniformity within an ingot and between ingots. A round robin was conducted on chemical analysis of D31. Agreement was good on carbon, molybdenum, and titanium, but oxygen, nitrogen, and hydrogen results varied to some degree. (auth)
- Research Organization:
- Crucible Steel Co. of America. Midland Research Lab., Penna.
- NSA Number:
- NSA-15-032497
- OSTI ID:
- 4837618
- Report Number(s):
- ASD-TR-7-784(V)
- Country of Publication:
- United States
- Language:
- English
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