| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Microstructure and Mechanical Behavior of Welded PBF-L Ti-6Al-4V |
| Author(s) |
Brett Tucker Roper, Jessica Buckner, Jay Carroll, Austin Pisani, Jack Herrmann, Stephen Spiak, Austin Olivier |
| On-Site Speaker (Planned) |
Brett Tucker Roper |
| Abstract Scope |
Titanium alloys are commonly used for applications where high strength-to-density ratio is desirable. Laser powder bed fusion (PBF-LM) is an increasingly popular additive manufacturing method which can produce unique geometries and shapes that would otherwise be impossible or difficult to manufacture with traditional methods. While it is ideal to integrate all features into a single AM part, limitations in build chamber size and design requirements can necessitate final integration of parts with a secondary joining operation. Thus, it is important to study how additively manufactured metal parts behave when joined with traditional methods, such as laser beam welding.
In this work, the microstructural and mechanical behaviors of wrought and PBF-LM Ti-6Al-4V parts with different heat treatments joined by laser beam welding are explicated. Tensile testing and fractography show how the failure behavior differs between wrought and AM Ti alloys with and without welds. Optical microscopy and electron backscatter diffraction show how the microstructure of the wrought vs AM Ti-6Al-4V evolve in the as-welded condition. Correlation of mechanical behavior to microstructural features is carried out with respect to solidification behavior of the Ti-6Al-4V alpha-beta alloy. In the wrought condition, welded samples experienced increased strength and lowered ductility across heat treatments. In the unwelded PBF-LM samples, heat treatments increased the ductility compared to the as-built condition. Welded PBF-LM sample properties varied based on heat treatment. Failure behavior and location differed within the samples due to the various heat treatments and resulting varied microstructures combined with the rapid solidification intrinsic to LBW forming martensitic alpha prime in the fusion zone.
Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525 |
| Proceedings Inclusion? |
Undecided |