Many modern-day applications require high-strength lightweight impact-resistant materials. This has
led to the consideration of unconventional processing routes to impart high strength and superior toughness
simultaneously in metallic alloys. Literature shows that cryogenic temperature rolling has the potential to
produce a bimodal microstructure, consisting of strength imparting fine grains and toughness providing coarse
grains. The investigations into the quasi-static mechanical properties of the cryorolled parts have shown a
significant improvement in both strength and toughness over the conventional ones. Thus, cryorolling is of
enormous relevance for the design engineers due to potential applications in aerospace and defence sectors.
However, studies involving the ballistic impact and the associated phenomena of various projectile-cryorolled
alloy target configurations due to normal and oblique impacts by projectiles of different nose shapes (viz.,
conical, ogival, hemispherical, blunt, etc.) are scarce. Also, the influence of rolling strains on the impact
behaviour of the targets is yet to be understood. This work proposes to investigate the ballistic behaviour of AA
6082 aluminium alloy targets cryorolled to different crogenic rolling strains, subjected to normal ballistic
impacts using cylindrical projectiles of dome and conical shapes. The focus is also on correlation of
experimental impact response with the mechanical properties and the microstructural features to ascertain their
influence on the energy dissipation and the observed fracture modes. Validation of a finite element model will
be attempted too.
A preliminary study is presented that confirms the superior ballistic impact properties of cryorolled
parts. The study also shows that there is an optimum cryogenic rolling strain for the best impact properties.