Results and Analysis
A typical as-processed MARM sample produced using a rectangular raster scan is shown
in Figure 1. Figure 2a exhibits the typical as-processed microstructure result. In the particular
parameter space examined, high power/low scan speeds yielded significant warping of the base
substrate while low power/high scan speeds resulted in minimal meltback, thus a tradeoff will
need to be made between meltback depth and substrate warping. Due to the polycrystalline
nature of the MARM alloy base substrate, the added material exhibited a similar polycrystalline
microstructure as can be noted in the micrographs in Figure 2a and b.