| About this Abstract |
| Meeting |
Additive Manufacturing Benchmarks 2022 (AM-Bench 2022)
|
| Symposium
|
Additive Manufacturing Benchmarks 2022 (AM-Bench 2022)
|
| Presentation Title |
Powder Oxygen Heterogeneities and Significant Intra-build Tensile Strength Variation from Common EB-PBF Ti-6Al-4V Powder Reuse Methods |
| Author(s) |
Nicholas A. Derimow, Jake Benzing, Newell Moser, Orion Kafka, Nik Hrabe, Priya Pathare, Frank DelRio |
| On-Site Speaker (Planned) |
Nicholas A. Derimow |
| Abstract Scope |
Tensile strength was found to vary significantly (15% changes in UTS and YS) within a single build of electron beam powder bed fusion (EB-PBF) Ti-6Al-4V, and heterogenous local oxygen content was found to be the major contributor to this strength variability. No significant correlation was found between tensile behavior (375 specimens tested) and plate location (X-Y), porosity (x-ray CT, fractography), alpha lath thickness (SEM-BSE), or crystallographic texture (SEM-EBSD). Strength was found to correlate with local oxygen content (inert gas fusion and TOF-SIMS) and build height (Z). Oxygen variation most likely arises from current EB-PBF Ti-6Al-4V powder reuse methods, which commonly involve frequent mixing of powders with differing oxygen content. Changes to powder reuse methodology to avoid significant differences in mechanical behavior for identical parts on the same build plate will be discussed. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
| Proceedings Inclusion? |
Undecided |