研究目的
Investigating the influences of adaptive slice thickness and retained heat effect on build geometry and microstructure in Laser Metal Deposition (LMD) process.
研究成果
The paper presented the influence of adaptive slice thickness and retained heat effect on thin-walled freeform LMD structures. Build height deviation was reduced from 3.4 mm to 1.2 mm through varying slice thickness strategy. The range of layer width was reduced from 1.15 mm to 0.36 mm, thereby increasing the geometrical accuracy. Additionally, finer microstructure, indicating better mechanical properties, can be achieved with increased wait time.
研究不足
The study focuses on Ti-6Al-4V freeform structures and the findings may not be directly applicable to other materials or geometries. The cooling rate was measured at the baseplate and not in the build geometry itself, which may not fully represent the cooling dynamics within the deposited layers.
1：Experimental Design and Method Selection
Experiments were carried out with a powder-fed LMD system to build Ti-6Al-4V freeform structures. The system setup included a 6 kW multi-mode continuous wave disk laser and a three-nozzle laser deposition head from Trumpf GmbH.
2：Sample Selection and Data Sources
Ti-6Al-4V spherical powder with diameter ranging between 80 μm and 150 μm was used. Optimized primary process parameters such as laser power, powder mass flow rate, process velocity and focus diameter were used.
3：List of Experimental Equipment and Materials
6 kW multi-mode continuous wave disk laser, three-nozzle laser deposition head from Trumpf GmbH, Ti-6Al-4V spherical powder, Coordinate Measuring Machine (CMM), Scanning Electron Microscope (SEM).
4：Experimental Procedures and Operational Workflow
The first iteration of experiments was carried out with an initial constant slice thickness value of 0.8 mm. The height measurement was carried out with a height master after the build process. Temperature at the baseplate was measured while depositing 80 layers of C-shaped structures, with different wait times and adaptive slice thickness strategy.
5：Data Analysis Methods
The build specimens were analyzed for geometrical accuracy using a Coordinate Measuring Machine. Microstructure of specimens was analyzed using dark field light microscopy and Scanning Electron Microscope (SEM) with backscatter electron detector (BSD).
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