| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
|
| Presentation Title |
Phase Stability of Laser Directed Energy Deposition Additive Manufactured Stainless Steels for Nuclear Applications |
| Author(s) |
Isabella J. Van Rooyen, Subhashish Meher, Asif Mahmud, Peter Renner, John Snitzer, Xiaoyuan Lou |
| On-Site Speaker (Planned) |
Isabella J. Van Rooyen |
| Abstract Scope |
This work presents a systematic study was conducted on laser directed energy deposition (DED) based additive manufacturing of nuclear-grade stainless steels such as austenitic A709, and ferritic/martensitic Grade-91 and Grade-92. Blocks of 1 cm3 were deposited with a broad range of laser powers, scan speeds and hatch spacings for optimization of build quality that resulted in densities more than 99.8%. The variation of surface roughness due to process parameters was determined as it directly influences the mechanical properties at high temperatures. Microstructural and mechanical characterization were carried out using electron microscopy, X-ray diffraction and Vickers hardness measurement that guided heat treatments of these alloys to determine the phase stability. Room temperature tensile tests were carried on these samples and compared with published measurements wrought and laser powder bed fusion builds. The present work provides guidance for successful deployment of the DED process for fabrication of structural components of nuclear reactors. |