NUMERICAL ANALYSIS OF TITANIUM BORIDE DISSOLUTION IN A TITANIUM MELT DURING LASER SURFACING
O.A. Shmagunov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: numerical simulation, laser surfacing, metal hardening, titanium boride, titanium carbide
Abstract
A numerical study is performed to investigate the effect of laser radiation parameters on the dissolution of titanium diboride (TiB2), a refractory compound used for surface hardening. A spherical TiB2 particle placed in a titanium melt containing nanoscale refractory modifier particles is considered. The simulation accounts for the nonuniform heating typical of laser powder surfacing. The dependence of the TiB2 particle dissolution time on laser power and surfacing speed is determined. A comparison with the dissolution of titanium carbide particles is made. The physical properties of TiB2 are shown to significantly affect the nature and time of its dissolution.
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