TUNGSTEN EXTRUSION DEVELOPMENT PROGRAM. Interim Technical Engineering Report, April 20, 1962-June 20, 1962

Technical Report · Wed Oct 31 04:00:00 EST 1962

OSTI ID:4789888

Riesen, A E

A solid round extrusion of as-cast W--3Mo alloy was partially accomplished from 3200 deg F at a reduction ratio of about 16.4: 1 and only 88% of liner capacity. Billet temperature of about 3200 deg F was established as the starting temperature for the extrusion of T shapes at a reduction ratio of about 17: 1. Nitriding and sulfidizing die surfaces prior to coating and diffusion treated, zirconia coated dies did not progress sufficiently to properly evaluate these processes for extrusion purposes. T shape extrusions of cast W-3Mo alloy were accomplished from 3100-- 3200 deg F at a reduction ratio of about 18: 1. These extrusions were made to study die glass composition and associated hardening point. Good dimensional run-out and light glass rub-in resulted from the use of soft rather than hard die glass. Good extrusion results were obtained with an extrusion die having a basic included entry angle of 130 degrees, 1/4inch constant land, minimum entry radius of 3/16-inch to a maximum entry radius of 5/ 16-inch, a surface hardness of Rockwell C 48 to 50 and.protected by 0.030 to 0.040-inch thick coating of zirconia applied by the oxyacetylene flamespray process with solid-rod feed. Die surfaces roughened to at least 500 rms appeared essential for sufficient bond strength with the zirconia coating. (auth)

• Research Organization: Wah Chang Corp., Albany, Ore.
• NSA Number: NSA-16-029349
• OSTI ID: 4789888
• Report Number(s): ASD-TR-7-793(IV)
• Country of Publication: United States
• Language: English

Related Subjects

COATING
COMBUSTION
CONFIGURATION
DIES
DIFFUSION
EXTRUSION
GLASS
HARDNESS
HIGH TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NITRIDES
RODS
SPUTTERING
SULFIDES
SURFACES
TEMPERING
TUNGSTEN ALLOYS
ZIRCONIUM OXIDES