AN APPRAISAL OF BRITTLE FRACTURE TEMPERATURE OF ROLLED ARMOR STEEL BY THE NRL DROP WEIGHT TEST

Abstract

Brittle fracture temperature determinations were made of 1/2-in.-thick rolled armor steels reflecting two chemical compositions. NilDuctility transition temperatures for the (MnCr-Mo) analysis varied from -50 to -110 F and for the Mn-Mo analysis from -80 to -130 F. During the early stages of this investigation a minor change in crack starter bead preparation was used. This change was continued in subsequent work and is offered as an alternative procedural step in drop weight specimen preparation. The use of several types of hard-facing electrode for crack starter beads and the influence of re-heat treatment after placement of crack starter beads on nil-ductility transition were also evaluated. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1961
Accession Number
AD0270034

Entities

People

  • Charles O. Mchugh
  • Victor H. Pagano

Organizations

  • United States Army Tank Automotive Research, Development and Engineering Center

Tags

DTIC Thesaurus Topics

  • Chemical Composition
  • Ductile Brittle Transition
  • Ductility
  • Electrodes
  • Heat Treatment
  • Transition Temperature
  • Transitions

Readers

  • Instructional Design and Training Evaluation.
  • Materials Science (Mechanical Engineering).
  • Metallurgy