Microstructural banding of directed energy deposition-additively manufactured 316L stainless steel

The microstructures of 316 L stainless steel created by rapid solidification are investigated here 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. Hi...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 69
Main Authors Hwa, Yoon, Kumai, Christopher S., Devine, Thomas M., Yang, Nancy, Yee, Joshua K., Hardwick, Ryan, Burgmann, Kai
Format Journal Article
LanguageEnglish
Published United States Elsevier 15.08.2020
Subjects
Additive manufacturing
Directed energy deposition
MATERIALS SCIENCE
Microstructure
Rapid solidification
Recoil pressure
Stainless steel
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Summary:The microstructures of 316 L stainless steel created by rapid solidification are investigated here 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.
Bibliography:AC04-94AL85000; NA0003525
SAND-2020-7241J
USDOE National Nuclear Security Administration (NNSA)
ISSN:1005-0302
1941-1162