Abstract
The purpose of this research was to evaluate the performance of a modified rolled homogeneous armor (MRHA) steel during ballistic impact tests. AerMet 100, AISI 1045 and 4130 steels were also tested for comparison with the MRHA results. The “white"‐etched portion of adiabatic shear bands was found on the front surface around penetration cavities in all the impacted armor plates. Scanning electron microscopic observation indicates that the adiabatic shear bands found in 4130, MRHA and AerMet 100 belong to transformed bands while those of 1045 steel are deformed bands. Ballistic test results show that the ballistic limit velocities of the 2.5‐mm thick MRHA steels are higher than those of AISI 1045 and 4130, and possibly compatible with AerMet 100 steel. For 2.5‐mm thick armor plates, the penetration modes were found to be dominated by ductile hole growth and plugging modes.
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