| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Design, Materials, Manufacturing, Challenges and Applications
|
| Presentation Title |
Mechanical Properties of SA508 Gr.3 Low Alloy Steel Using Directed Energy Deposition |
| Author(s) |
Wonjong Jeong, Young-Bum Chun, Suk Hoon Kang, Chang Kyu Rhee, Chang Hyoung Yoo, Seongjin Yoo, Hongmul Kim, Ho Jin Ryu |
| On-Site Speaker (Planned) |
Wonjong Jeong |
| Abstract Scope |
Reactor pressure vessels (RPVs) in Small Modular Reactors require complex shapes to reduce volume. This study used directed energy deposition, an additive manufacturing technique, to fabricate SA508 Gr.3 low alloy steel samples for the RPV, were fabricated using short or long raster scan strategies to vary thermal conditions. Both samples formed columnar grains at the melt pool boundary, but the short raster sample showed an increase in precipitate size, precipitate number density, and grain size compared to the long raster sample. The short raster samples had lower yield strength, higher elongation, and more isotropic tensile properties compared to the long raster samples. However, both samples showed relatively low upper shelf energy and large anisotropy in the case of the Charpy test, due to columnar grain formation. These findings highlight the need for microstructural control during the process for RPV manufacturing to be a viable option by directed energy deposition. |