Ballistic and Metallurgical Investigation of Helmets Edge-Annealed in a 'Tocco' Induction Heating Unit.
WATERTOWN ARSENAL LABS MA
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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.
- Metallurgy and Metallography
- Protective Equipment