| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
F-46: Microstructure and Mechanical Characterization of AISI 4340 Steel Additively Manufactured by Laser Powder Bed Fusion |
| Author(s) |
Felix Aguilar, Thinh Huynh, Yongho Sohn |
| On-Site Speaker (Planned) |
Felix Aguilar |
| Abstract Scope |
Laser powder bed fusion (LPBF) processing optimization of high strength low alloy AISI 4340 steel was investigated in this study by varying laser powers and scan speeds. Relative density above 99.8 % was obtained using a combination of 200 W and 600 mm/s. The as-fabricated LPBF specimens consisted of martensite decorated by microsegregation with hardness as high as 454+/-10 HV. Samples produced using lower energy densities generally achieved higher hardness than those produced using higher energy densities. Furthermore, excessive energy density input during the LPBF process resulted in varying hardness as a function of build height. Changes in the as-fabricated microstructure and phase constituents across LPBF processing parameters were documented via scanning electron microscopy and x-ray diffraction, and correlated to mechanical characteristics obtained via hardness and uniaxial tension tests. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Characterization |