Accession Number : ADA293683

Title :   Hot Compression Testing of Tungsten.

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD

Personal Author(s) : Vassilaros, M. G.

PDF Url : ADA293683

Report Date : MAR 1995

Pagination or Media Count : 67

Abstract : A study of the high temperature deformation behavior of tungsten was performed. The cylindrical specimen dimensions were 0.4 inch diameter and 0.6 inch long (10.2 x 15.2 mm) as machined from a tungsten forging. The compression tests were performed in a thermal-mechanical simulator "Gleeble 1500" at temperatures of 600 to 3000 deg F (315 to 1650 deg C). The specimens were deformed to a strain of approximately 0.3 with lubricated test fixtures that suppressed any specimen barreling. Compressive stress - stain curves were produced for all specimens and analyzed for 0.2% offset strength as well as 1.0, 2.0 and 5.0% offset strengths. The strengths were observed to decrease with higher temperatures, but appeared to be on a plateau at 50 ksi (345 MPa) in the temperature range of 1200 to 2200 deg F (650 to 1200 deg C) . The compression specimens tested at or below 10000 F (538 deg C) experienced cracking. The fracture mode appeared to be intergranular in a single phase microstructure with an elongated grain shape. (MM)

Descriptors :   *STRESS STRAIN RELATIONS, *TUNGSTEN, *COMPRESSIVE PROPERTIES, MICROSTRUCTURE, HIGH TEMPERATURE, DEFORMATION, CRACKS, STRAIN(MECHANICS), STRENGTH(MECHANICS), FRACTURE(MECHANICS), FORGING, BILLETS(MATERIALS), POWDER METALLURGY, ELONGATION, LUBRICATION, METALLOGRAPHY, SINTERING, HOT WORKING, TEST FIXTURES.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE