|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
||Time-resolved Structural Characterization of Ni Alloy 718 under Laser Processing with In-situ Synchrotron X-ray Diffraction
||Seunghee Oh, Rachel Lim, Joseph Aroh, Benjamin J. Gould, Andrew C. Chuang, Robert M. Suter, Anthony D. Rollett
|On-Site Speaker (Planned)
Laser melting is key for various additive manufacturing applications because of its superior power, speed, and process resolution. It induces strong temperature gradients, which cause rapid and unique phase evolution not measurable by traditional instruments. To study this in Ni alloy 718, we performed in-situ X-ray diffraction measurements using high-energy synchrotron x-rays and a high-speed large-area detector. The spatially and temporally resolved observation allows us to examine the microstructures and lattice parameters in resolidified and heat-affected alloy 718. The collected diffraction patterns demonstrate transient changes in phase and structure parameters of the lattices. Combined with microscopy, the deformation can be identified and quantified, which presents the most frequent deformation occurring in the lattices oriented to parallel and vertical to the laser scan direction. Additionally, the results indicate that the anisotropicity of the lattices in FCC contributes to not only the evolution in the lattice parameters but also the deformation behavior.
||Additive Manufacturing, Characterization, Solidification