Abstract
The paper presents the results of optical diagnostics of evaporation and displacement of powder fractions during the formation of a single track in the process of selective laser melting. The velocity of the powder fractions is estimated. It was defined, that an increase in the scanning speed leads to an decrease in the particle coming out rate from the molten pool and the rate at which they are attracted. The results allow evaluating the kinetics of the mass-transfer process during selective laser melting. It was clearly shown the material quality properties after the selective laser melting are strongly influenced by the formed thermal field in the laser-irradiated zone.
Highlights
Laser material processing becomes already quite common in the modern industry, for example such processes as laser cutting, welding, drilling, marking
Such fundamental problems which are necessary to solve are: powder consolidation kinetics and its dependence of process parameters, intensive powder release from powder consolidation zone: its causes, methods of influence on it; physical mechanisms leading to geometry instability of fused bead, instability at overcharged and undercharged scanning speeds of the laser beam relative to the optimal values, mechanisms of integration of individual track in a single one. etc
The basis for active control systems developing is the results of the optical diagnostics of selective laser melting (SLM) process [1, 2]
Summary
Laser material processing becomes already quite common in the modern industry, for example such processes as laser cutting, welding, drilling, marking. Technologies of additive manufacturing (growing) of parts from metal powders are becoming more popular and characterizing by fundamentally different manufacturing strategy: layer by layer It should be mentioned, that the lack of theoretical apparatus describing the process technology is the fundamental problem in the field of laser treatment. That the lack of theoretical apparatus describing the process technology is the fundamental problem in the field of laser treatment Such fundamental problems which are necessary to solve are: powder consolidation kinetics and its dependence of process parameters, intensive powder release (slopping) from powder consolidation zone: its causes, methods of influence on it; physical mechanisms leading to geometry instability of fused bead, instability at overcharged and undercharged scanning speeds of the laser beam relative to the optimal values, mechanisms of integration of individual track in a single one.
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