|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
||Long-term Process Stability in Laser Powder Bed Fusion
||Michael Heiden, Scott Jensen, Jay Carroll, Priya Pathare, David Saiz, Jonathan Pegues, Bradley Jared, Brad Boyce
|On-Site Speaker (Planned)
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.
||Additive Manufacturing, Process Technology, Mechanical Properties