Metal Additive Manufacturing Conference 2018

The paper deals with investigation of the yield and fracture locus for steels parts created by Selective Laser Melting process. Metallic parts produced by additive manufacturing techniques yield presently different mechanical behaviour from wrought materials. Moreover, the AM processes exhibit directional anisotropy of mechanical properties. The paper is going to compare plasticity and fracture locus for wrought material and material produced by Additive Manufacturing (AM). In the case of the AM material also directional properties anisotropy of the plasticity and fracture locus is going to be addressed. Namely, build direction, horizontal and also properties of specimens build in 45°to base plate are going to be scrutinized and compared together. Plasticity plane and fracture locus are going to be determined with the use of notch and plane bar specimens to capture wide range of triaxiality. In order to address shear behaviour also flat shear specimens are going to be employed co cover low range of the triaxialities. Testing is going to be performed under quasi-static loading conditions at room temperature. Mises and Hill material models are going to be employed here for the plastic behaviour description and fracture locus will be described using Johnson-Cook and MMC approach. Mechanical behaviour response under multiaxial loading condition are confronted here for wrought materials and AM processed specimens produced in three build directions. Results point out anisotropic behaviour in the build directions investigated and difference in plasticity and fracture response between wrought and AM processed materials pointing out potentials and weak point of parts produced by AM.