Abstract
The ballistic performance of a work hardened nitrogen alloyed austenitic steel (P900) was studied by a light gas gun at a projectile velocity of 2500 m/s. To compare ballistic efficiency and residual microstructure to classical martensitic armor steels, tests with a high hardness armor steel were performed. The hardness of the work hardened P900 and the armor steel were 380 HV30 and 500 HV30, respectively. Both steels proved to offer an identical ballistic performance. Measurements of hardness around the crater have shown a strong increase of hardness for P900 whereas the hardness of the armor steel did not change. Compression tests on a split-Hopkinson-pressure-bar show that nitrogen alloyed austenitic steel strain harden very strongly and possess very high strain rate sensitivity. Strain hardening and strain rate sensitivity of high hardness armor steels are very small. Grain sizes in the heat-affected zone near the crater of nitrogen alloyed steels give information about temperature and heating time.
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