Inverse Columnar-Equiaxed Transition (CET) in 304 and 316L Stainless Steels Melt by Electron Beam for Additive Manufacturing (AM)

• Published in: Crystals (Basel) Vol. 11; no. 8; p. 856
• Main Authors: Miyata, Yuichiro, Okugawa, Masayuki, Koizumi, Yuichiro, Nakano, Takayoshi
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 23.07.2021
• Subjects: 304 stainless steel; 316L stainless steel; Additive manufacturing; Computational fluid dynamics; computational thermal-fluid dynamics simulation; Criteria; Electron beams; electron-beam melting; Equiaxed structure; Flow velocity; Grains; High temperature; Lasers; Manufacturing; Melting; Microstructure; Morphology; Powder beds; powder-bed fusion; Research methodology; Simulation; Single crystals; Solidification; Solids; Stainless steel; Stainless steels; Japan

According to Hunt’s columnar-to-equiaxed transition (CET) criterion, which is generally accepted, a high-temperature gradient (G) in the solidification front is preferable to a low G for forming columnar grains. Here, we report the opposite tendency found in the solidification microstructure of stai...