Metal Additive Manufacturing Conference 2019

This study deals with investigation of bulk parts created by Additive Manufacturing (AM) processes. The numerical simulation of AM was used for description of thermal behaviour of bulk parts during the production process. Industrial metal 3D printer InssTek MX-600 was chosen for experimental device because it is classified as a Directed Energy Deposition (DED) technology by ASTM. Further, an austenitic stainless steel 316 was selected because phase transformations do not occur during heating in this steel. The objectives of this study are twofold: firstly the numerical model of the DED was created to calibrate, to reach high accuracy. Secondly, to determinate the residual stress by contour method. The numerical model was created in Simufact welding software to describe the thermal behaviour of each layer during the process and thanks to numerical simulation was analysed the sensitivity of the process parameters to thermal behaviour of printed part and to compare with the experimental result. The contour method was applied to evaluate the residual stress in part printed by DED. The printed part was cut and measured and then the residual stress was evaluted using the inverse analysis by FEM. The result of this study can be used to build complex structures for components such as turbine blades, energy facilities or medical implants.