| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
| Presentation Title |
In-situ Carbide-driven CoCrFeMnNi High-entropy Alloy Matrix Nanocomposites Manufactured by Laser Powder Bed Fusion: Carbon Content and Heat Treatment Effects on Microstructure, Room and Cryogenic Tensile, High Temperature Creep Properties |
| Author(s) |
Kee-Ahn Lee, Young-Kyun Kim, So-Yeon Park, Sangsun Yang |
| On-Site Speaker (Planned) |
Kee-Ahn Lee |
| Abstract Scope |
A carbon–containing CrMnFeCoNi high–entropy alloy (C–HEA) nanocomposite was additively manufactured via a laser powder bed fusion (LPBF). The effect of carbon contents (0.5, 1.0, and 1.5 at.%) on the microstructure, tensile, and high temperature creep properties were investigated. With an increase in carbon content, the number density of nano-sized carbides, and the average grain sizes and columnar widths increased. The strength, work hardening rate, and elongation of LPBF C-HEAs were enhanced as the carbon content increased. The tensile strength of aged 1.5C-HEA at 650 °C was ∼1.2 GPa at room temperature. The superior cryogenic tensile strength of 1.6 GPa of 1.5C-HEA was also obtained. A creep test conducted at 873 K enabled the stress exponent, n, to be obtained with values of 3.03 in the low stress region and 6.99 in the high stress region. The deformation mechanisms of LPBF C-HEAs were also discussed in this study. |