Accession Number : AD0474068

Title :   DEVELOPMENT OF ADVANCED TECHNIQUES FOR THE FABRICATION OF REFRACTORY METAL TUBING.

Descriptive Note : Final technical rept. 1 Jun 64-2 Aug 65,

Corporate Author : TEXTRON INC WEST CONCORD MA NUCLEAR METALS DIV

Personal Author(s) : Huber, R. F.

Report Date : OCT 1965

Pagination or Media Count : 139

Abstract : The purpose of this manufacturing process development program was to make improved refractory metal tubing by planetary ball swaging. Techniques were developed for the primary breakdown of refractory alloys into suitable tube blanks. A planetary ball swaging machine was designed, constructed and used as a processing method for converting the tube blanks into various size refractory metal tubes. The tubing was characterized by destructive and non-destructive testing. Swaging schedules were developed to process the refractory metal tube blanks into 1/2, 1/4, and 1/8-inch OD tubing with 0.020, 0.015 and 0.010-inch wall thickness respectively. Destructive and non-destructive testing was carried out to characterize the tubing. Ultimate tensile strength for the Ta - 10 w/o W tubes at room temperature and in the cold-worked condition was between 146,000 and 152,000 psi. All tubes passed helium leak testing but imperfections were detected in the Cb-752 tubes by Zyglo and ultrasonics. The defects appeared to be minor and to have little or no effect on mechanical properties, except for reduced flarability in the 1/8-inch Cb-752 tube. All finished tubes were found to be within target specifications dimensionally, with surface finishes equal to or better than 4 micro-inches. (Author)

Descriptors :   *PIPES), (*MANUFACTURING, EXTRUSION, MECHANICAL PROPERTIES, FRACTURE(MECHANICS), SURFACE PROPERTIES, MICROSTRUCTURE, TANTALUM ALLOYS, NIOBIUM ALLOYS, COLD WORKING.

Subject Categories : Fabrication Metallurgy
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE