FINISH MILLING STUDY OF Ti-6Al-4V PRODUCED BY LASER METAL DEPOSITION (LMD)

Abstract

Components produced and repaired by the Laser Metal Deposition (LMD) process require finish-machining steps in order to improve the poor geometrical tolerance of the functional surfaces. In this work, the LMD process was conducted to build up samples from Ti-6Al-4V powders. The effect of the face milling process on surface roughness of the Ti-6Al-4V parts was studied in different build directions. The effect of the heat treatment was also considered. Changes in roughness and micro-hardness were evaluated and compared in each condition. Cutting forces were also measured in order to evaluate loading characteristic on the cutting insert. The heat-treated sample shows lower cutting forces in comparison with the as-build material. Different values of the surface roughness of the machined parts were obtained as a consequence of the microstructure variation.

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