Multiscale characterization of surface integrity of machined Inconel 718

The surface integrity of Inconel 718 encompasses both the physical topography and the altered material properties beneath the surface, which depends on machining parameters such as depth of cut, feed and cutting speed. This study demonstrates the characterization of surface integrity by comparing different high-resolution methods. Passive force during turning was hereby identified as a key factor for subsurface deformation, whereas an increase of the thermomechanical load led to an increase in white layer, that was successfully investigated employing transmission-kikuchi-diffraction. • Heterogeneous deformation in subsurface regions after turning. • Grain size in white layer was quantified by Transmission-Kikuchi-diffraction. • subsurface deformation correlates with passive forces during turning. • work hardening was quantified based on hardness and dislocation density.