研究目的
To develop new materials for Electron Beam Melting (EBM) additive manufacturing by exploring the use of blended powders and in-situ alloying to achieve composite-like and alloyed materials with improved or unique properties, addressing challenges in material behavior, equipment optimization, and powder availability.
研究成果
The research demonstrates the feasibility of using blended powders in EBM to create materials with gradient microstructures, such as composite-like peripheries and alloyed cores, enabling properties like ductility and hardness in the same component. This approach offers cost-effective alternatives to pre-alloyed powders and opens new avenues for material design in additive manufacturing. Future work should focus on optimizing process parameters and expanding to other material systems.
研究不足
The study is limited by the need for further optimization of process parameters for different powder blends and blending ratios. Challenges include ensuring consistent powder layer formation with non-spherical or irregular powders and the high cost and availability of small test batches. The research is exploratory and requires more in-depth studies to fully characterize material properties and scalability.
1：Experimental Design and Method Selection:
The study involves modifying an ARCAM EBM A2 machine to handle small powder batches (100-200 ml) and testing blended powders for in-situ alloying and composite formation. The rationale is to overcome limitations in powder availability and explore new material properties through electron beam energy deposition control.
2：Sample Selection and Data Sources:
Powders from various suppliers, including titanium and iron-based materials (e.g., 316L stainless steel, ASI 4140, Colferoloy 103), were manually mixed by shaking for 15-20 minutes. Selection criteria focused on powders with non-standard grain sizes and shapes to test the modified system's capabilities.
3：List of Experimental Equipment and Materials:
Modified ARCAM EBM A2 machine with altered powder dispenser and raking mechanism, round start plates (82 mm diameter), powder containers made from aluminum profile, various powder blends (e.g., 316L steel with other alloys), and etching reagents like Kroll's reagent for microstructure analysis.
4：Experimental Procedures and Operational Workflow:
The modified machine was used to deposit and melt powder layers. Electron beam parameters were adjusted to achieve either alloying or composite formation in different parts of the sample. Samples were built, removed, polished, etched, and analyzed using optical microscopy and SEM with EDS for microstructure and composition.
5：Data Analysis Methods:
Microstructural analysis was performed using optical microscopy and scanning electron microscopy (SEM), with energy-dispersive X-ray spectroscopy (EDS) for compositional analysis to verify in-situ alloying and composite formation.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
