|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Carbon-containing CrMnFeCoNi High-Entropy Alloy Matrix Nanocomposite Additively Manufactured by Selective Laser Melting: Effect of Carbon Contents on the Microstructure, Tensile Property and Deformation Behavior
||Ji-Eun Ahn, Young-Kyun Kim, Sangsun Yang, Kee-Ahn Lee
|On-Site Speaker (Planned)
Carbon-containing ultra-high strength CrMnFeCoNi high-entropy alloys (C-HEA) were manufactured by selective laser melting (SLM), and the effect of carbon content on microstructure, mechanical properties and deformation behaviors were investigated. The three C contents of 0.5, 1.0 and 1.5 at.% were used in this work. SLM-built C-HEAs revealed different characteristics of epitaxial growth grains, dislocation networks and nano-sized carbides depending on the carbon contents. It was found that the increase of carbon content leaded to rise in number density of nano-sized carbides. The yield strength (YS) increased (653.0, 751.6 and 753.7 MPa respectively) as the C content increased, while also improving the ductility. Dislocation networks hindered the dislocation motion early-to-later stages of deformation, and this leaded to the higher back-stresses in the SLM-built C-HEAs. Deformation twins were also formed at the early-stage of deformation in three samples because critical stress for twinning was similar to that of YS of SLM-built C-HEAs.