Abstract
Abstract The unusual properties of nitrogen alloyed austenitic steels have been reported in the recent two decades in many papers. In this work it is aimed to investigate a P900 alloy subjected to a hypervelocity impact. The P900 alloy was work hardened to a medium hardness of 380 HV30 by cold expansion of a ring. Tungsten heavy metal and pure tungsten were used as projectile materials. The geometry of the long rods was 3 mm × 30 mm for diameter and length, respectively. Ballistic tests were performed with a two-stage light-gas gun at velocities from about 2000 m/s up to about 4500 m/s. It was found that two kinds of crater geometry are possible depending on the tendency of the projectile material to adiabatic shear banding or brittle fracture. The brittle W material achieved a deeper crater than the shear band forming W heavy alloy.
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