A micro-damage investigation on a low-alloy steel tested using a 7.62-mm AP projectile | [Raziskava mikropoškodb malolegiranega jekla po preizkusu s kroglo AP 7,62 mm]

Abstract

Low-alloy steels have been widely used as an armor material in defense systems due to their superior mechanical and weldability properties. In this study, microdamage formation in an AISI 4140 steel, which was hit by 7.62-mm armor-piercing (AP) projectile, was investigated. Analyses of the microstructure and microhardness after ballistic testing were performed to correlate the microstructure-property relationship. Two different types of adiabatic shear band (ASB) were observed in the tested samples. The experimental results indicated that the type and hardness of the bands were strongly related to the hardness and ballistic performance of the steel specimens.Malolegirana jekla se uporabljajo za obrambne sisteme predvsem zaradi njihovih bolj{ih lastnosti in varivosti. V tem delu je raziskan nastanek po{kodbe v jeklu AISI 4140 po udarcu prebojne krogle 7,62 mm v oklep. Mikrostruktura in mikrotrdota sta po balisti~nem preizkusu korelirana z odnosom mikrostruktura-lastnosti. V preizkusnih vzorcih sta opa`eni dve vrsti adiabatskih stri`nih pasov (ASB). Rezultati so pokazali, da sta vrsta in trdota pasov zelo povezani s trdoto in balisti~nimi lastnostmi vzorcev jekla