High-resolution reciprocal space mapping reveals dislocation structure evolution during 3D printing

Dislocation structures are ubiquitous in any 3D printed alloy and they play a primary role determining the mechanical response of an alloy. While it is understood that these form due to rapid solidification during printing, there no consensus on whether evolve subsequent solid-state thermal cycling occurs with further addition layers. In order design microstructures desired responses, crucial first answer this outstanding question. To end, novel experiment has been conducted by employing high resolution reciprocal space mapping, synchrotron-based X-ray diffraction technique, situ printing austenitic stainless steel. It reveals dislocation formed undergo significant evolution cycling, particular few (up 5) layers above layer interest.