DEVELOPMENT OF HIGH STRENGTH COLUMBIUM AND TANTALUM ALLOY TUBING. Quarterly Progress Report No. 2, March 1, 1962-May 31, 1963

Technical Report · Fri Jul 12 04:00:00 EDT 1963

OSTI ID:4015248

Buckman, Jr, R W

The evaluation of the extrudability of B-66 (Nb--5V-5Mo--1Zr) and T-111 (Ta--8W--2Hf) at a reduction ratio of 7 : 1 was accomplished. An evacuated mild steel can was used as cladding for the extrusion billets. Both B-66 billets were extruded at 2200 deg F, using ram speeds of 275 and 1000 inches per minute. The billet extruded at a ram speed of 275 inches per minute exhibited slight rattlesnaking for 6 inches near the nose end, with the balance of the asextruded surface smooth and free of defects. Increasing the rara speed to 1000 inches per minute resulted in mod erate rattlesnaking and circumferential cracking the entire length of the billet. The depth of the cracks was 0.0200.040 inches. The extrusion constant for B-66, based on the running pressure, was 78--84 ksi. The initial T-111 billet was extruded at 2200 deg F and at a ram speed of 175 inches per minute. The as-extruded surface was smooth and free of defects. Increasing the temperature to 2300 deg F and the ram speed to 1000 inches per minute resulted in slight rattlesnaking over a 6-inch length approximately 6 inches from the nose end. The balance of the extrusion was free of defects. The increase in extrusion temperature and ram speed decreased the extrusion constant for T-111 from 84 ksi at 2200 deg F to 80 ksi at 2300 deg F. Results of the extrusion evaluation, using solid billets, indicate that the extrusion of tubular billets of B-66 and T-111 at 7 : 1 reduction ratios is feasible using the mild steel cladding technique. A portion of the B-66 solid rod extrusion was conditioned and after heat treatment will be gun drilled. This starting tubular shape will be used to evaluate the hot drawing characteristics of B-66. (auth)

• Research Organization: Westinghouse Electric Corp. Astronuclear Lab., Pittsburgh
• NSA Number: NSA-18-020487
• OSTI ID: 4015248
• Report Number(s): WANL-PR-(N)-002
• Country of Publication: United States
• Language: English

Related Subjects

BRANCHING RATIO
CARBON STEELS
COATING
CRACKS
DECAY
DEFECTS
EXTRUSION
HAFNIUM ALLOYS
HEAT TREATMENTS
HIGH TEMPERATURE
HOT WORKING
MACHINING
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
RODS
SURFACES
TANTALUM ALLOYS
TUBES
TUNGSTEN ALLOYS
VANADIUM ALLOYS
VELOCITY
WIRES
ZIRCONIUM ALLOYS