Metallurgical Examination of German Aircraft Armor from Heinkel III and Junkers 87 Planes.
WATERTOWN ARSENAL LABS MA
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The object is to conduct a metallurgical examination of eight sections of German Aircraft Armor from Heinkel III and Junkers 87 planes. The armor plates examined were composed of approximately .45 carbon steels containing wide variations in alloy content specifically Cr-Mo-V, Si-Cr-Mo, Mn-Si, and Si-Cr-V types were used. the plates were made from good quality steel except for plates 1A, 1B, 4 and 10A heat treated to hardnesses ranging from 388-514 Brinnel. As shown by the fracture test, the impact resistance of the plates from the JU87 plane and some of the plates from the Heinkel planes was inferior to that obtained in good quality American aircraft armor of the thickness employed 5-8 mm.. This agrees with the ballistic results in which it was found that the plates exhibited high resistance to penetration but inferior resistance to shock.
- Metallurgy and Metallography