Dorte Juul Jensen

Abstract

Tailored Heterostructures in metal additive manufacturing

Even the most simple standard 3D printing of metals, for example using laser powder bed fusion (LPBF), leads to heterogeneous microstructures far from equilibrium. There are differences between melt pool boundaries and centres, skinny centreline grains may grow over long distances, and there may be significant differences between the first and last printed layers. Additionally, changes in print parameters, scanning schedule and beam shape during the build will lead to further development of heterogeneities – in this case to more tailored heterostructures. In the talk these aspects will be discussed based on case stories encompassing:

· Effects of alignment of multiple texture components on tensile properties of stainless steel (SS) 316L manufactured by LPBF

· Possibilities in tailoring local magnetic properties in SS 17-4 PH by LPBF

· Impact of build plate grain structure and laser beam shape on the evolving microstructure

· Effects of melt pool and grain structures on the coarsening of Si particles in LPBF AlSiMg during annealing studied by synchrotron X-ray techniques

· A new mini LPBF device for in-situ X-ray studies of microstructural evolution used for tracking the local phase evolution in SS 17-4 PH during printing