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Vol.50, No.2, 107 ~ 116, 2012
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| Title |
| Characterization of the Deposited Layer Obtained by Direct Laser Melting of Fe-Cr Based Metal Powder |
| 장정환 Jeong Hwan Jang , 주병돈 Byeong Don Joo , 전찬후 Chan Hu Jeon , 문영훈 Young Hoon Moon |
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| Abstract |
| Direct laser melting (DLM) is a powder-based additive manufacturing process to produce parts by layer-by-layer laser melting. As the properties of the manufactured parts depend strongly on the deposited laser-melted bead, deposited layers obtained by the DLM process were characterized in this study. This investigation used a 200 W fiber laser to produce single-line beads under a variety of different energy distributions. In order to obtain a feasible range for the two main process parameters (i.e. laser power and scan rate), bead shapes of single track deposition were intensively investigated. The effects of the processing parameters, such as powder layer thickness and scan spacing, on geometries of the deposited layers have also been analyzed. As a result, minimum energy criteria that can achieve a complete melting have been suggested at the given powder layer thickness. The surface roughnesses of the deposited beads were strongly dependent on the overlap ratio of adjacent beads and on the energy distributions of laser power. Through microstructural analysis and hardness measurement, the morphological and mechanical properties of the deposited layers at various overlapped beads have also been characterized. |
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| Key Words |
| direct Laser melting, powder processing, Fe-Cr based metal powder materials, microstructure, deposited Layer |
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