Abstract
The influence of the nitrogen content in argon/nitrogen gas mixture on mechanism of titanium nitrides formation during laser surface processing of titanium alloy Ti6Al4V with high power diode laser was investigated. The phase composition and microhardness on cross-section of surface layers were analyzed and described. It was found that the nucleation of TiN dendrites in nitrogen rich atmosphere (at least 75 % of N2) takes place on the liquid/gas boundary as a result of the reaction between molten titanium and gaseous nitrogen. The subsequent growth of titanium nitride dendrites (crystallization) proceeds into the liquid metal (weld pool), perpendicularly to the top surface. High length of the titanium nitride dendrites up to 180÷250 μm in the surface layer produced in pure nitrogen atmosphere indicates also very rapid rate of dendrites growth in the molten titanium. The tendency to form titanium nitrides during laser surface processing of the investigated titanium alloy falls dawn with the decrease of nitrogen content in the gas mixture.
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