Thermal management during direct laser deposition (DLD) of Ti-6Al-4V components

摘要: Direct Laser Deposition (DLD) introduces steep thermal gradients into components due to the localised, high temperature melt region created by laser heat source. This causes local expansion and plastic deformation during heating leads a permanent change in geometry of component. There is also an effect on microstructure therefore mechanical properties. In this study, measurements were taken across substrate DLD repair, under varying controlled conditions data was used calculate cooling rates at different locations, these correlated observed distortion changes microstructure. It found that rate varied significantly outer edges but hardly all near processing area, indicating while gradient plate will affect distortion, it has little microstructure. The measured plotted against same location, showing evidence inverse binomial form relationship. Despite relatively small size study indicator how process can be developed further.