Accession Number : AD0685836

Title :   FRACTURE SURFACE TOPOGRAPHY AND TOUGHNESS OF 4340 STEEL.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s) : Carr,Frank L. ; Larson,Frank R.

Report Date : FEB 1969

Pagination or Media Count : 19

Abstract : AISI 4340 steel was heat treated to eight strength levels by tempering groups of specimens at intervals of 100 F between 500 F and 1200 F. Tension, notch tension, and Charpy V-notch impact specimens were machined from these materials and tested over a range of temperatures between that of liquid nitrogen and 400 F. The fracture of each specimen was examined at low magnification and each zone of fracture surface configuration was measured. When plotted as a function of testing temperature, these measurements resulted in transitional curves for all three types of specimens. (Author)

Descriptors :   (*STEEL, FRACTOGRAPHY), HEAT TREATMENT, TENSILE PROPERTIES, NOTCH TOUGHNESS, IMPACT TESTS, FRACTURE(MECHANICS), QUENCHING, SURFACE ROUGHNESS, VISUAL INSPECTION, DUCTILE BRITTLE TRANSITION

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE