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1018 steel witness plates were put into contact with the explosives Ammonium Nitrate and Fuel Oil (ANFO), composition C4, dynamite, flake trinitrotoluene (TNT), smokeless powder and black powder. Explosive-induced pitting of the metal targets was observed in tests involving C4, dynamite, TNT and smokeless powder. The microstructure directly under pitting sites was examined using standard metallographic techniques. No sign of melting was observed under or around the pits, indicating that pitting is most likely caused by impingement of hard particles on the metal surface during combustion of the explosive material, or by jet formation from the collapse of voids at the explosive/target interface.

Explosive pitting of 1018 steel witness plates