Abstract
Thin 316L stainless steel rods were fabricated by continuous directed energy deposition in Z direction. The process parameters (laser power, scan velocity, and powder feeding rate) were carefully selected to obtain a stable deposition process and the effects of powder feeding rate and scan velocity were studied. A preliminary study on microstructure and tensile properties of the specimens was carried out. Results indicated that the specimen showed superior austenite/ferrite (γ/δ) dual phase microstructure, high strength (608.24 MPa), and good plastic deformation capacity (65.08% shrinkage rate) when setting the laser power at 45.2 W, powder feeding rate at 2.81 g/min, and scan velocity at 0.5 mm/s. The technique reported in this paper is expected to lay the foundation for the deposition of wire or frame structures more efficiently than traditional layer-by-layer directed energy deposition.
Original language | English (US) |
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Pages (from-to) | 474-481 |
Number of pages | 8 |
Journal | Additive Manufacturing |
Volume | 27 |
DOIs | |
State | Published - May 2019 |
Funding
This work has been supported by the Shun Hing Institute of Advanced Engineering, CUHK , # RNE-p4-17 ; and the start-up fund provided by the McCormick School of Engineering, Northwestern University, Evanston, USA .
Keywords
- 316L
- Continuous directed energy deposition
- Stainless steel
- Z direction
ASJC Scopus subject areas
- Biomedical Engineering
- General Materials Science
- Engineering (miscellaneous)
- Industrial and Manufacturing Engineering