期刊
JOURNAL OF LASER APPLICATIONS
卷 29, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.2351/1.4979702
关键词
Inconel (R) 718; laser cladding; additive manufacturing; microstructure; hardness; directed energy deposition; parameter development
资金
- Office of Naval Research [N00014-11-1-0668]
- Air Force Research Laboratory [FA8650-12-2-7230]
Single-bead, laser-deposited Inconel (R) 718 tracks atop substrates of the same composition were studied to ascertain the influence of laser power, processing speed, working distance, and substrate preheat on the fusion zone geometry, microstructure, and hardness. Modifying working distance encompassed both a change in powder flow distribution and beam diameter. Laser power and processing speed linearly affected fusion zone width and area, though laser power was found to have the most significant effect of all processing parameters. Preheating the substrates increased the width of the fusion zone by an average of 16% and led to a more uniform hardness throughout. The fusion zone cross-section was found to morph from semicircular to double-parabolic (wavy) with increasing laser power. This was attributed to surface tension induced Marangoni flow and the influence of surface-activated species on surface tension. The applicability of coupled parameters, including linear heat input and normalized enthalpy were investigated. Given the limited data available on the influence of processing parameters, particularly working distance and substrate temperature, on fusion zone geometry and hardness, results reported here may aid experimentalists and modelers working on cladding and additive manufacturing processes. (C) 2017 Laser Institute of America.
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