Degree
Doctor of Philosophy (PhD)
Department
Engineering Science
Document Type
Dissertation
Abstract
Additive manufacturing (AM) has created new opportunities for high-performance alloys for use in complex components across the aerospace, industrial, automotive, and energy industries. Among AM techniques, laser powder bed fusion (L-PBF) is widely used for alloy parts fabrication. However, L-PBF parameters optimized in laboratory do not always translate into a production environment. This dissertation first investigates the effects of various L-PBF systems and parameters on the thermal properties of GRCop-84 and GRCop-42 parts fabricated via L-PBF. Subsequently, thermal properties of L-PBF prepared nickel alloys, including GRX-810 and Inconel 718, were investigated. GRX-810 is a novel oxide-dispersion-strengthened NiCoCr-based alloy recently developed by NASA. GRX-810 has been fabricated using L-PBF to facilitate the homogeneous dispersion of nanoscale yttria particles throughout the material's intricate microstructure. However, Yttria ratio of the alloy could significantly impact its performance which is still lack of knowledge. This dissertation explored the relationship between the Yttria content and mechanical properties and thermal properties of GRX-810. Finally, thermal properties of Inconel 718 prepared by different L-PBF systems were investigated to evaluate the variability due to the use of different fabrication systems.
Date
1-5-2026
Recommended Citation
CHEN, YEHONG, "Thermal performance of additively manufactured alloys" (2026). LSU Doctoral Dissertations. 6976.
https://repository.lsu.edu/gradschool_dissertations/6976
Committee Chair
Shengmin Guo