Browsing by Subject "deposition track morphology"
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Item A Parametric Study on Grain Structure in Selective Laser Melting Process for Stainless Steel 316L(University of Texas at Austin, 2017) Sun, Dongwei; Li, Xuxiao; Tan, WendaLaser Selective Melting (SLM) process is used in this work to produce 3-dimensional samples of Stainless Steel (SS) 316L. The effects of laser power, scanning speed, and laser scanning strategy on the track morphology and grain structure are investigated. As the laser heat input is increased by increasing laser power and/or decreasing laser scanning speed, the surface morphology of the SLM track will vary according to the extent of powder melting, and the grain size will increase correspondingly. Different laser scanning strategies can produce different grain patterns, and a noticeable porosity can be found if the scanning strategy is not appropriate. The grains in the bottom layers of the built samples inherit the crystallographic orientations from the substrate through epitaxial growth; nucleation takes places in the top layers and introduces new grains of random crystallographic orientations into the built samples.