| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
|
| Presentation Title |
Towards More Consistent Microstructures in Laser Powder Bed Fusion 17-4 PH Stainless Steel |
| Author(s) |
Michael Haines, Ehsan Farabi, Vitor V Rielli, Nima Haghdadi, Sophie Primig |
| On-Site Speaker (Planned) |
Michael Haines |
| Abstract Scope |
17-4 Precipitation hardened (PH) stainless steel is known for its excellent mechanical properties and corrosion resistance and therefore has found applications in demanding environments in the power, chemical, and marine industries. Laser powder bed fusion additive manufacturing (AM) of 17-4PH has seen recent interest due to the design freedom offered by AM. However, 17-4PH has been shown to be difficult to process due to complex phase routes that can result in variations in as-built and heat-treated microstructures, dependent on the initial powder composition and processing parameters. Recent insights into phase transformation pathways from advanced characterization and computational material science will be summarized. These results provide better fundamental understanding of the complex development of as-built microstructures. The impact of heat treatments on the martensite grain boundary characteristics, known to influence mechanical and corrosion properties is also covered. Lastly, mitigating strategies towards limiting the microstructural variability in 17-4PH will be discussed. |