Microstructural banding of directed energy deposition-additively manufactured 316L stainless steel. (10th April 2021)

• Record Type: Journal Article
• Authors: Hwa, Yoon; Kumai, Christopher S.; Devine, Thomas M.; Yang, Nancy; Yee, Joshua K.; Hardwick, Ryan; Burgmann, Kai
• Is Part Of: Journal of materials science & technology. Volume 69(2021)
• Page Start: 96
• Page End: 105
• Publication Date: 2021-04-10
• Subjects: Additive manufacturing -- Directed energy deposition -- Stainless steel -- Rapid solidification -- Recoil pressure -- Microstructure; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.08.022
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: The microstructures of 316 L stainless steel created by rapid solidification are investigated by comparing the similar microstructures of individual hatches of directed energy deposition additive manufacturing (DED-AM) and those of single, laser surface-melted tracks formed on a solid plate. High recoil pressure, which is exponentially dependent on the laser beam power density, induces convection of the melt pool, which causes formation of microstructural bands in the as-solidified microstructure. The microstructural bands are associated with changes in the chromium concentration and are a significant component of the inhomogeneous microstructure of DED-AM.