Non-isothermal β grain growth behaviour of pure titanium under laser quenching

Abstract

The primary understanding of laser-induced non-isothermal prior β grain growth behaviour of titanium alloys is given by adopting laser quenching on pure titanium. Results indicate that the prior β grains grow obviously within the limited laser interaction time. By establishing a finite element model combined with numerical approximations, the growth activation energy of prior β grain under laser-induced non-isothermal condition is determined as 44.4 kJ/mol, which is comparable to that under isothermal conditions. Grain boundary migration behaviour of pure titanium under laser-induced non-isothermal conditions is the same as that under isothermal conditions, but the prior β grain growth kinetics is largely accelerated due to the high heat input from the laser beam.