研究目的
Investigating the laser beam melting (LBM) process based on the complete-melting energy density for commercially pure titanium (CP-Ti) to understand the effects on part's density and microstructure.
研究成果
The theoretical complete-melting energy density for CP-Ti was thermodynamically calculated for the LBM process parameter setting. Microstructural change was confirmed, focused on porosity corresponding to the energy density. An optimized process condition having higher energy efficiency with proper energy density could be realized using the complete-melting energy density.
研究不足
The study is limited to commercially pure titanium and does not explore other materials. The absorptance of CP-Ti powder could vary depending on the shape and size distribution, potentially affecting the accuracy of energy density calculations.
1：Experimental Design and Method Selection:
The study involved setting process parameters based on the thermodynamically calculated energy density for full melting of CP-Ti.
2：Sample Selection and Data Sources:
CP-Ti specimens were fabricated using the Realizer SLM300i 3D printer with LBM method and spherical powders of grade 1 CP-Ti.
3：List of Experimental Equipment and Materials:
Realizer SLM300i 3D printer, Keyence VHX-5000 optical microscope, Mitutoyo HM-200 Vickers hardness tester.
4：Experimental Procedures and Operational Workflow:
Specimens were designed as 10 × 10 × 10 cm3 cubic structures. Microstructural study was conducted on the parallel plane with the building direction at the center region of the cubic specimen.
5：Data Analysis Methods:
The relative density was investigated using the averaged planar density with 10 OM images of each specimen. Vickers hardness was measured at the center region of each specimen along the building direction.
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