Accession Number : ADA954988

Title :   Ballistic and Metallurgical Investigation of Helmets Edge-Annealed in a 'Tocco' Induction Heating Unit.

Descriptive Note : Memorandum rept.,

Corporate Author : WATERTOWN ARSENAL LABS MA

Personal Author(s) : Hurlich,A.

Report Date : 18 JUL 1944

Pagination or Media Count : 11

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 fromation 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.

Descriptors :   ANNEALING, BALLISTICS, DUCTILITY, EDGES, HARDNESS, HEATERS, HELMETS, INDUCTION SYSTEMS, METALLOGRAPHY, METALLURGY, SURVEYS, TEST METHODS, TRANSITIONS

Subject Categories : Metallurgy and Metallography
      Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE