Influence of material constitutive models on thermomechanical behaviors in the laser powder bed fusion of Ti-6Al-4V

A transient three-dimensional thermomechanical model was developed to examine the evolution of thermal and mechanical fields in laser powder bed fusion Ti-6Al-4V alloy, particularly with respect development plastic strain. primary focus evaluate influence material constitutive models on predicted behaviors. Johnson-Cook (JC) were chosen account for contribution strain, strain rate, temperature responses. Three different modifications JC applied assess sensitivity rate hardening temperature-dependent prediction. Numerical results revealed that stress highly sensitive rate-dependent term but minimally affected by hardening. The maximum differences average stresses strains 23% 13% when comparing between without hardening, respectively. Moreover, it found mostly occurred at intermediate temperatures, ≈ 1000 – 1600 K, during continuous cooling phase. Finally, present study emphasizes importance behavior as well providing insight further exploration process parameter optimization.