The purpose of this research was to evaluate the effectiveness of 10 different cast iron materials during ballistic impact tests. The specific aim of these tests was to obtain data suitable for hydrodynamic mode energy of each material at two impact velocities, 3000 and 4500 ft/s, then compare them to rolled homogeneous armor steel (RHA) and certain surrogates of RHA, such as hardened wrought 4340 steel. The ten cast iron materials were ferritic malleable iron, oil quench and tempered malleable iron, as-cast ferritic ductile iron, as-cast pearlitic ductile iron, austempered ductile iron (four different austempering temperatures), and austempered malleable iron (two different austempering temperatures). Based on the data developed during the first phase of this research, additional research was done to evaluate the ballistic impact of three austempered iron materials, one grade of austempered malleable iron and two grades of austempered ductile iron. Comparisons were matte to the amount of hydrodynamic mode energy developed in these materials with that of rolled homogeneous armor steel. Based on this limited research, the results indicate that austempered ductile iron of certain grades provide more protection against penetration than the austempered malleable iron tested, and have comparable hydrodynamic mode energy of RHA steel. Both austempered malleable iron and austempered ductile iron did exhibit brittle failures of varying degrees and significant rear surface spall. Austempered malleable iron showed more brittleness than austempered ductile iron. It is suggested that austempered ductile iron with 'Gradient Property, ' if it could be developed, may minimize the brittleness and rear spalling during impact and, thus, offer an alternate armor material to RHA steel. It is expected that the replacement of monolithic RHA by monolithic more advanced austempered ductile iron result in approximately 10 % reduction in armor weight.
Ballistic evaluation. Part 1. Ten different cast iron materials
Ballistische Bewertung von Ersatzwerkstoffen für Panzerstahl. Teil 1. Zehn unterschiedliche Gußeisensorten
1996
8 Seiten, 9 Bilder, 2 Tabellen, 24 Quellen
Conference paper
English
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