Parameter development and characterization of laser powder directed energy deposition of Nb – Alloy C103 for thin wall geometries
[1];
[1];
[2];
[2];
[3];
- Univ. of Texas at El Paso, TX (United States); W.M. Keck Center for 3D Innovation, El Paso, TX (United States)
- NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- W.M. Keck Center for 3D Innovation, El Paso, TX (United States); Univ. of Texas at El Paso, TX (United States)
This work focuses on the parameter development and microstructural characterization of Nb-based alloy C103 for thin wall structures produced via laser powder – directed energy deposition (LP – DED). Laser power and scanning speeds were varied as part of a design of experiments to identify adequate print parameters. Combinations were evaluated for relative density, porosity, and geometrical accuracy. A combination of a laser power of 1420 W and scanning speed of 14 mm/s resulted in a relative density >99%, exhibited a consistent weld bead profile and was used for further microstructural evaluation. A mix of optical and scanning electron microscopy (SEM) revealed small, slightly elongated grains along the edges and large epitaxial grains in the central region along the Build – Transverse view. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis revealed Hf rich columnar cells in the center that transition into an evenly spaced cellular structure towards the edges of the built sample. Electron backscatter diffraction (EBSD) scans show a sharp [001] texture when looking at the cross section of the sample along the build direction. The Build – Scan view revealed a zig – zag pattern that follows the back – and – forth deposition strategy that was used. Finally, microhardness measurements were taken in the as – built (AB) and stress relieved (SR) conditions to baseline preliminary mechanical properties. The AB condition exhibited a large amount of scatter in the data and averages up to 11% larger than the SR condition. The reduction in scatter upon applying the SR cycle are indicative of a large concertation of dislocations present in the AB condition.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 2346103
- Report Number(s):
- LA-UR--24-20683
- Journal Information:
- Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Vol. 30; ISSN 2238-7854
- Publisher:
- Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructural heterogeneities in additively manufactured refractory alloy C103 and their implications for room and elevated temperature mechanical behavior
Microstructure and Properties of Inconel 718 Fabricated by Directed Energy Deposition with In-Situ Ultrasonic Impact Peening