|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Effects of Laser Beam Intensity Profile on the Evolution of Microstructure and Defects in 316L SS Components Fabricated via Laser Engineered Net Shaping
||Baolong Zheng, Nancy Y.C. Yang, Josh Yee, James C. Haley, Thale R. Smith, Yizhang Zhou, Enrique J. Lavernia, Julie M. Schoenung
|On-Site Speaker (Planned)
The development and application of laser-based additive manufacturing (LAM) technologies is growing rapidly; however, LAM methods have a relatively small process window for laser performance, where minor changes in laser beam characteristics and scanning parameters can significantly affect build quality. In this study, continuous wave (CW) Nd:YAG and Yb fiber lasers with Gaussian and flat-top laser intensity distributions, respectively, are explored for LAM with laser engineered net shaping (LENSŪ), a directed energy deposition (DED) technique. The influences of laser intensity distribution on the evolution of microstructure and defects in LENSŪ fabricated 316L SS components are reported. SEM, EBSD, TEM, and X-ray computed tomography are used to visualize the microstructure and defects. Results show a relatively larger process window available for the Nd:YAG laser, while lower maintenance Yb fiber laser offers increased efficiency. The microstructure, defects, and thermal behavior related to laser intensity profile during LAM processing are analyzed and discussed.
||Planned: Supplemental Proceedings volume