THE DEVELOPMENT OF OPTIMUM MANUFACTURING METHODS FOR COLUMBIUM ALLOY FORGINGS. PHASE IIA: EVALUATION OF FOUR TECHNIQUES FOR CONSOLIDATION OF A COLUMBIUM BASE ALLOY (F48) CONTAINING 15%W, 5%Mo AND 1% Zr. Interim Technical Engineering Report II for February 1, 1960-September 15, 1960

Technical Report · Tue Oct 31 04:00:00 EST 1961

OSTI ID:4092285

Darby, R F; Carson, R O

Consolidation techniques (double vacuum arc melting, double electron beam melting, electron beam first melt followed by vacuum arc remelt, and a pressed and sintered ingot) were evaluated for fabricating a Nb-5Mo-15W- 1Zr alloy (F48). The electron beam first melt plus vacuum arc remelted ingot exhibited the best over-all quality. The chemistry and macrostructure were uniform and, with the exception of low oxygen and marginally low zirconium, satisfied the chemical specifications. The double vacuum arc melted ingot was uniform in chemistry and, with the excep tion of high and variable oxygen content, met the specification requirements. A high segregated oxygen content made fabrication of this material difficult. The double electron beam melted ingot was very low in interstitial content and showed considerably more variation in chemical properties than the other ingots. The pressed and sintered ingot had low density (77%), and its chemistry was uniform except for high oxygen content. (For preceding period see AD

• Research Organization: Crucible Steel Co. of America. Research Lab., Penna.
• NSA Number: NSA-15-005337
• OSTI ID: 4092285
• Report Number(s): AMC-TR-7-782(II)
• Country of Publication: United States
• Language: English

Related Subjects

CASTING
COMPACTING
CRYSTALS
DEFECTS
DENSITY
DISTRIBUTION
ELECTRIC ARCS
ELECTRON BEAMS
INTERSTITIALS
LATTICES
MELTING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
OXYGEN
QUALITATIVE ANALYSIS
QUANTITY RATIO
SINTERING
TUNGSTEN ALLOYS
VACUUM
ZIRCONIUM
ZIRCONIUM ALLOYS