Interaction of laser radiation with the material during production powders and fibers

The effect of laser radiation on a solid body leads to change in the temperature field processed substance. nature heating, which is determined by rate and gradients, different depending properties material processing conditions. main physical parameters process solids are specific power absorbed stream 10 4 –10 9 W/cm 2 interaction time metal with beam – –5 –8 s. When such pulses interact surface, an instantaneous explosive melting part occurs substance surrounding surface transferred plasma state. subsequent expansion accompanied appearance shock wave peak pressure 1–10 GPa, acts material, dispersed. mathematical problem heating cylindrical plate light flux that normally affects its solved. this described system thermal conductivity equations three sections heated plate, characterized factor 1) 0 ≤ t m ; 2) > 3) < h (here , moment corresponding beginning formation liquid phase end respectively). calculated dependences changes alloys X18N10T, X15N60 during action pulse duration τ=5 ms presented. presence transition associated (an inflection curves) temporary decrease growth. distribution fields causes significant heterogeneity over thickness materials, reaches 2000 °C or more conditions exposure. curves repeat shape pulse, rest has nonlinear tendency increase output asymptote. It established sputtering requires volume above point at 300–350 microns impact energy 7–8 J. Reducing level 5–6 J increasing workpiece than 500 does not provide required for implementation spraying process.