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

• 作者: Yoon Hwa Christopher S.Kumai Thomas M.Devine Nancy Yang Joshua K.Yee Ryan Hardwick Kai Burgmann
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（10）
• 页码范围: 96-105
• 页数: 10页
• 语种: 英文

摘要

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.