Structural Properties of Dual Hardness Steel Armor
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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f a high-hardness, high-carbon frontal plate metallurgically bonded to a softer lower carbon steel backup. Since the concept of DHS used for both structural and armor purposes is new, relatively little information is available to designers on the structural properties after ballistic impact. In the present paper, four different lots of DHS having target hardness levels of Rc 60 for the frontal portion and Rc 50 for the backup are considered. One lot was produced by standard ausforming techniques while the other three were conventionally produced heat-treatable roll-bonded steels. Base-line mechanical property data are given. These include tensile, fatigue crack propagation, and S-N behavior. The effects of varying temperature and frequency on crack propagation rate are shown. Ballistically damaged specimens are used to provide information on residual strength and residual life.
- Metallurgy and Metallography