研究目的
To evaluate the effect of clogging different streams of a 4-stream discrete coaxial nozzle in the powder mass flow and in the clad geometry when depositing Alloy 718 at different feed rate direction.
研究成果
The study demonstrated that the 4-stream setup is the only one that can obtain a circular distribution in the convergence distance. Clogging of streams changes the clad characteristics, with more notable effects at higher numbers of streams disabled. The 2-activated stream symmetrically setup suggests potential applications for coating and repair slots.
研究不足
The study is limited to the use of a 4-stream discrete coaxial nozzle and Alloy 718. The effects of other nozzle designs or materials were not explored.
1：Experimental Design and Method Selection:
The study involves the use of a 4-stream discrete coaxial nozzle for LMD to evaluate the effect of stream clogging on powder mass flow and clad geometry.
2：Sample Selection and Data Sources:
Nickel-based Alloy 718 powder with a granulometry range between 45 and 150 μm was used as filler material, and the substrate material was in an annealed state.
3：List of Experimental Equipment and Materials:
IBARMIA ZVH45/1600 Add+Process hybrid machine, Precitec YC52LMD coaxial head, Sulzer Metco TWIN-10-C Powder Feeder, Yb-Fiber Rofin FL030 Laser generator.
4：Experimental Procedures and Operational Workflow:
The study was divided into two steps: studying the convergence distance and powder mass flow distribution, and manufacturing single clads for each nozzle setup to measure clad characteristics.
5：Data Analysis Methods:
The clad characteristics were measured using Motic SMZ-143 microscopy and Clemex Captiva? software.
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