| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
|
| Presentation Title |
Long-term Process Stability in Laser Powder Bed Fusion |
| Author(s) |
Michael Heiden, Scott Jensen, Jay Carroll, Priya Pathare, David Saiz, Jonathan Pegues, Bradley Jared, Brad Boyce |
| On-Site Speaker (Planned) |
Michael Heiden |
| Abstract Scope |
While the geometric design freedom allowed by laser powder bed fusion (L-PBF) enables creation of complex parts with fine features, challenges associated with process qualification can deter wider adoption. Furthermore, a lack of historical performance data for statistical process control of witness coupons lowers confidence in the AM process. Here, we demonstrate long-term monitoring and variability assessment using small-featured (~1 mm) and larger material witness coupons. More than 550 tensile bars and 80 Charpy bars were built alongside various 316L L-PBF stainless steel parts to monitor tensile properties, density, hardness, and Charpy impact toughness. This collection of measurements was used to determine detectable property shifts correlated to L-PBF process changes. This study not only reveals the utility of monitoring process control via witness coupons but illustrates the sensitivity of different coupon types to detect L-PBF process changes.
SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Process Technology, Mechanical Properties |