Dilution and Aspect Ratio Properties on Performance of Laser Deposited Ti-Al-Si-Cu/Ti-6Al-4V Composite Coatings

Abstract

In spite of the fact that Laser additive manufacturing (AM) processes have a similar material additive manufacturing theory, each AM procedure has its particular features in terms of operational materials and applicable situations. In recent years, additive manufacturing techniques have been acquainted as a promising technique to generate metallic parts since they can annihilate the familiar problems associated with conventional techniques. The results of the investigation showed that as the transverse speed increases, the material that is distributed to the substrate per unit length decreases and therefore that there is an inverse relationship with clad width, melt pool depth and clad height. Hence as the scanning speed increases the width if the height is smaller and the depth of the pool will be smaller too. The results indicate that the specimens manufactured at 900 W, had a decrease in dilution by 3.83%, 1.29% for Ti-Al-11Si-5Cu and Ti-Al-12Si-2Cu respectively when the scanning speed is increased. However, for Ti-Al-13Si-6Cu, there is an increase in the dilution by 1.06%, which can be attributed to the increase of the deposit area below the substrate than above. The results evidently show that increasing the laser scanning speed, increases the aspect ratio of the specimens for laser processing condition 900 W. This relationship is observed in attribution to the clad height being reduced as the scan speed is increased. Moreover, the varying scanning speed influences the clad height more significantly than the clad width; hence, the significant increase in the aspect ratio.