Ballistic and Metallurgical Investigation of Helmets Edge-Annealed in a "Tocco" Induction Heating Unit

Abstract

The edge annealing of the entire circumference of the M1 helmet in a "Tocco" induction heating unit was found to satisfactorily stress relieve the edge. Ballistic testing of the edge annealed zone and the transition zone show ballistic characteristics identical to those of un-annealed helmets. No tendency towards crack formation exists. Ninety degree band tests reveal the improved ductility of the annealed zone. Hardness surveys and metallographic examination indicate a zone of completely recrystallized, dead-soft metal at the edge of the helmets.

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Document Details

Document Type
Technical Report
Publication Date
Jul 18, 1944
Accession Number
ADA954988

Entities

People

  • A. Hurlich

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Acids
  • Annealing
  • Base Metal
  • Crack Propagation
  • Cracks
  • Ductility
  • Grain Boundaries
  • Hardness
  • Heating
  • Induction Heating
  • Instructions
  • Metals
  • Munitions
  • Projectiles
  • Residual Stress
  • Seam Welding
  • Stresses
  • Transitions

Readers

  • Human-Computer Interaction (HCI).
  • Metallurgy