Ultrahigh-Strength Nanostructured Steels for Armours

Bogdan GARBARZ; Bogdan GARBARZ

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Tytuł: Ultrahigh-Strength Nanostructured Steels for Armours ; Ultrahigh-Strength Nanostructured Steels for Armours

Abstrakt:

The paper presents principles of designing and examination results of superclean high-strength new generation maraging steel for composite armours protecting against piercing with small-calibre armour-piercing (AP) projectiles. The research concerns maraging steel of yield strength ≥ 2,5 GPa and suitable toughness required to achieve high resistance of armour to piercing with AP projectiles. Three base compositions of maraging steel (MS) of yield strength 400 ksi, 500 ksi and 550 ksi with different content of alloying elements Fe, Ni, Co, Mo, W, V are described. The process of vacuum melting of the concerned steels was presented as well as further processing, i.e. homogenizing treatment, hot working, machining, solution treatment, ageing and grinding in order to prepare plates with dimensions of 50 × 50 × 10 mm. The manner of perpendicular firing at the aforementioned plates placed on a stand with RHA armour “witness” plate is presented. Moreover, demonstrated are also the visible results of maraging plates firing with 12,7 mm B-32 type armour-piercing incendiary projectiles on RHA plates. Also shown are the images of scans performed using an electron microscope of maraging plates’ fracture surface generated by firing.
; The paper presents principles of designing and examination results of superclean high-strength new generation maraging steel for composite armours protecting against piercing with small-calibre armour-piercing (AP) projectiles. The research concerns maraging steel of yield strength ≥ 2,5 GPa and suitable toughness required to achieve high resistance of armour to piercing with AP projectiles. Three base compositions of maraging steel (MS) of yield strength 400 ksi, 500 ksi and 550 ksi with different content of alloying elements Fe, Ni, Co, Mo, W, V are described. The process of vacuum melting of the concerned steels was presented as well as further processing, i.e. homogenizing treatment, hot working, machining, solution treatment, ageing and grinding in order to prepare plates with dimensions of 50 × 50 × 10 mm. The manner of perpendicular firing at the aforementioned plates placed on a stand with RHA armour “witness” plate is presented. Moreover, demonstrated are also the visible results of maraging plates firing with 12,7 mm B-32 type armour-piercing incendiary projectiles on RHA plates. Also shown are the images of scans performed using an electron microscope of maraging plates’ fracture surface generated by firing.