| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
|
| Presentation Title |
Process Window Approach for Qualification of Laser Powder Bed Fusion |
| Author(s) |
Anthony D. Rollett, Jack Beuth, John Lewandowski, Sneha Narra, Kenji Shimada, Craig Brice, Frank Medina, Ryan Wicker, Elizabeth Holm, Albert To, Kirk Rogers, Ayman Salem |
| On-Site Speaker (Planned) |
Anthony D. Rollett |
| Abstract Scope |
Under support from the NASA ULI program, CMU has partnered with other institutions and companies to develop a qualification methodology for Laser Powder Bed Fusion (LPBF) based on determining a process window (PW) for Ti-6Al-4V. The PW is based on a space of the main parameters such as power, speed, hatch etc. Fatigue samples have been printed in multiple printers at three different universities, as well as a NASA research center. The PW is quantified via porosity and 4-point bend fatigue, both of which show PW boundaries for keyhole and lack-of-fusion porosity and a minimum porosity approximately in the center of the PW. Although fatigue cracks normally start at defects, for optimal printing conditions, cracks instead start in a microstructural feature. The methodology has been transferred successfully to a small company printing an advanced aluminum alloy. |