Penetration Damaging Bahavior of Two Kinds of Bimodal Microstructure of Ti-6Al-4V Alloy

Penetration tests of two kinds of bimodal microstructure of Ti-6Al-4V alloy were conducted using 7.62mm piercing incendiary projectiles. Damage appearance of crater, microstructure evolution and characteristics of adiabatic shear band were analyzed. The results showed: 1) Bimodal microstructure included equiaxial and acicular grain. The plasticity of acicular grain was lower than exuiaxal grain, which resulted in more dynamic recrystallization subgrain and bifurcations. 2) The characteristics of adiabatic shear band in two kinds of bimodal microstructure had obvious differences. The adiabatic shear bands in 1# Ti-6Al-4V alloy were reticularly distributed, and the density of adiabatic shear bands was obviously larger than that of