Abstract
In this work experimental and modeling methods are used to relate the processing parameters of laser power, velocity, and hatch spacing to thermal-mechanical history in a LPBF process, and first steps are made to relate to mechanical properties. Experimental work including tensile testing, microscopy, and density measurements are completed. Physics-based thermal simulations modeling the melting and re-solidification of layers of IN-718 powder are accomplished with consideration of powder consolidation on evolving geometry. Meltpool geometry results from the thermal simulations are compared alongside the experimental results with a proposed porosity indicator parameter that is expected to correlate to the level of porosity in a LPBF IN-718 part. Initial results show a linear relationship between the proposed porosity indicator parameter and the porosity percentage in LPBF IN-718 samples.
