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Superior ballistic performance of high-nitrogen steels against deformable and non-deformable projectiles

机译：高氮钢对可变形和不可变形弹丸的出色弹道性能

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摘要

Hot-rolled high-nitrogen steel (HNS) plates were evaluated against AK-47 mild steel core (7.62 mm x 39 mm, deformable) and 14.5 mm armour piercing (AP) (14.5 mm x 114 mm, hard steel core) projectiles. The ballistic results of HNS plates were compared with conventionally used Rolled Homogeneous Armour (RHA) steel plates. The ballistic tests on HNS and RHA steel plates with different thicknesses were conducted against AK-47 mild steel core and 14.5 mm AP projectiles at velocities of 740 +/- 10 m/s and 1000 +/- 10 m/s respectively, in order to find out the minimum thickness required to stop the projectile without perforation. In comparison to RHA steel, HNS exhibited higher ballistic performance (in terms of minimum areal density required) against both AK-47 mild steel core and 14.5 mm armour piercing projectiles. The ballistic results against 14.5 mm AP was studied using an analytical model reported in literature. Detailed post ballistic (microstructural and hardness measurements) investigations were carried out to understand the ballistic performance of the two steels. Further, an attempt has been made to correlate the initial microstructure and mechanical properties with the failure mechanisms activated during ballistic impact and the resulting ballistic performance.
机译：对AK-47低碳钢芯（7.62 mm x 39 mm，可变形）和14.5 mm铠装穿刺（AP）（14.5 mm x 114 mm，硬钢芯）弹丸进行热轧高氮钢（HNS）板评估。将HNS板的弹道结果与常规使用的轧制均质装甲（RHA）钢板进行了比较。依次对AK-47低碳钢芯和14.5 mm AP弹丸分别以740 +/- 10 m / s和1000 +/- 10 m / s的速度对HNS和RHA钢板进行了弹道测试找出阻止射弹不打孔所需的最小厚度。与RHA钢相比，HNS对AK-47低碳钢芯和14.5 mm穿甲弹的弹道均显示出更高的弹道性能（就所需的最小面密度而言）。使用文献报道的分析模型研究了针对14.5毫米AP的弹道结果。进行了详细的后弹道研究（显微组织和硬度测量），以了解两种钢的弹道性能。此外，已经尝试将初始的微观结构和机械性能与在弹道撞击期间激活的破坏机制以及所产生的弹道性能相关联。

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