Experimental determination of thermal emissivities for Ti6Al4V in SLM method

Abstract

This study was carried out in order to precisely measure the temperatures, which play an important role in reducing the errors that occur during the manufacturing of Ti6Al4V materials by the Selective laser melting method. In order to use thermal cameras in the SLM method, the thermal emissivity values of samples with different surface properties depending on the temperatures were experimentally determined. Emissivity values were determined up to a temperature of 550^oC due to oxidation. Emissivity measurement was obtained by verification with the help of a surface thermocouple. Emissivity values were obtained between 0.31-0.40 in measurements depending on the surface roughness and temperatures up to 550^oC. The changes in the surface properties depending on the temperature cause changes in the emissivity.