Product Code: PIC2008_504

Direct Diode Laser Deposition of Functionally Graded Ti-6Al-4V and Inconel 718 Components
Authors:
Kamran Shah, The University of Manchester; Manchester Great Britain
Andrew Pinkerton, The University of Manchester; Manchester Great Britain
Richard Moat, The University of Manchester; Manchester Great Britain
Lin Li, The University of Manchester; Manchester Great Britain
Michael Preuss, The University of Manchester; Manchester Great Britain
Presented at PICALO 2008

Direct laser deposition (DLD) has developed from a prototyping to a single metal manufacturing tool. Its potential for creating multi-material and functionally graded structures is now beginning to be explored. In this work, three dimensional functionally graded structures of Ti-6Al-4V and Inconel 718 are fabricated by direct laser deposition (DLD) on Inconel 718 substrate. The multi-track parts are built using a coaxial nozzle and 1.5 kW Diode laser operating in continuous and pulsed beam modes. Microstructure characterization and phase identification are performed by optical microscopy, scanning electron microscopy and X-ray diffraction. Elemental distributions in the alloy transition regions are determined by electron probe microanalysis (EPMA) and the relationship between the various phases, residual stresses and crack initiation are also explored. Results show the potential of the technique but also highlight potential problems such as the formation of residual stresses.