Top surface and side roughness of Inconel 625 parts processed using selective laser melting

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Differences in microstructure and properties between selective laser melting and traditional manufacturing for fabrication of metal parts: A review (2015, background): “Figure 6(a) shows the cracks formed in Ni625 superalloy [39].”
Wire-feed additive manufacturing of metal components: technologies, developments and future interests (2015, background): “04 9–10 [23, 24]”
Surface texture metrology for metal additive manufacturing: a review (2016, background): “By far, the most frequently adopted texture parameter in the literature is the ISO 4287 profile parameter Ra, the arithmetic mean deviation of the assessed profile [18,27,29,45,49,74,76].”
A Review on Laser Powder Bed Fusion of Inconel 625 Nickel-Based Alloy (2019, methodology): “By controlling these factors reasonably, low Ra on the top surface and side can be obtained simultaneously [56,57].”
An overview of powder granulometry on feedstock and part performance in the selective laser melting process (2017, methodology): “In addition, the top surface roughness (perpendicular to build direction) is mainly created by rippling motions of the melt pool while side surface roughness (parallel to the build direction) is the likely outcome of segregated melt drawn to the layer edges under Marangoni convection and surface ten”