ON THE EFFECTS OF ANNEALING AND GRAIN SIZE IN POWDER-METALLURGY TUNGSTEN.

Abstract

Mechanical properties of powder-metallurgy tungsten were studied at low temperatures. Particular emphasis was placed on the effects of annealing temperatures and grain size on the ductile-brittle transition behavior. While room-temperature hardness and grain size were little sensitive to temperature changes within the 1500 to 2300 C range, tensile behavior was markedly influenced. Variation of grain size was achieved by straining and annealing. Grain size effects were evaluated in terms of the Petch-analysis. Fracture was at all times predominantly intergranular. The results of this investigation suggest that the high ductilebrittle transition temperature of tungsten is not sufficiently explained by strong dislocation-impurity atom interaction. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1963
Accession Number
AD0422980

Entities

People

  • Friedrich G. Ostermann

Organizations

  • Air Force Research Laboratory

Tags

DTIC Thesaurus Topics

  • Advanced Materials
  • Annealing
  • Biomedical And Dental Materials
  • Climate Change
  • Ductile Brittle Transition
  • Grain Size
  • Hardness
  • Low Temperature
  • Materials
  • Mechanical Properties
  • Metallurgy
  • Powder Metallurgy
  • Transition Temperature
  • Transitions
  • Tungsten

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.