Investigation of the mechanism of nanostructuring of near-surface titanium layers under the influence of nanosecond laser pulses

The microstructure of near-surface layers of submicrocrystalline (SMC) technical titanium brand VT1-0 after laser treatment under the water layer with nanosecond pulses with an irradiation power density of $F$ = 2 GW/cm$^2$ was studied. The effect of significant reduction of the initial SMC structure to a nanostructured state in a thin near-surface layer with a thickness of about 1 $\mu$m was found. The possibility of implementing physical mechanisms of nanostructuring of near-surface layers associated with phase recrystallization or rotational dynamic recrystallization is considered.