COLUMBIUM POWDER METALLURGY PROJECT QUARTERLY PROGRESS REPORT NO. 4, PERIOD COVERED FEBRUARY 1, 1961 TO MAY 31, 1961

Technical Report · Mon Oct 30 23:00:00 EST 1961

OSTI ID:4842763

Robertshaw, T L

A study was made of the inert-arc-welding of F-48 sheet produced from hot pressed compacts. Despite scatter in bend test data, it was deduced that the welded sheet is as ductile as sheet from arc-cast material and can withstand almost three times as high a temperature as the arc-cast sheet before failure in the 6T radius bend test (longitudinal welds). In preliminary tensile, stress- rupture, and bend tests the powdered sheets are 85% as strong and quite as ductile as the arc cast product. Preliminary efforts to produce purer prealloyed powders through special hydriding and crushing were unsuccessful. The addition of 0.5% yttrium did not enhance the working, welding, or oxidation resistance of F-48 sheet. In processing compacts, large scrap losses are avoided by forging at 2200 deg F prior to rolling at 1400 deg F. Canning in titanium alloys will provide the necessary protection at 2200 deg F for the more porous sintered product. Final rolling temperatures are lowered to75O deg F. A half-pound billet is rolled to 95% reduction with a 75% yield of material. (N.W.R.)

• Research Organization: General Electric Co. Flight Propulsion Lab. Dept., Cincinnati
• NSA Number: NSA-15-029666
• OSTI ID: 4842763
• Report Number(s): NP-10663
• Country of Publication: United States
• Language: English

Related Subjects

CANNING
COMPACTING
CRUSHING
DEFORMATION
DUCTILITY
ELECTRIC ARCS
FAILURES
FORGING
HIGH TEMPERATURE
HYDRIDES
IMPURITIES
INERT GASES
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
NIOBIUM
NIOBIUM ALLOYS
OXIDATION
POROSITY
POWDER METALLURGY
PREPARATION
ROLLING
SHEETS
SINTERED MATERIALS
STRESSES
TENSILE PROPERTIES
TITANIUM ALLOYS
WELDING
YTTRIUM