研究目的
To provide a set of well characterized benchmarks to aid in the development of models for additive manufacturing processes, specifically focusing on the behavior of melt pools produced by laser powder bed fusion.
研究成果
The study successfully created and quantified the morphology of autogenous laser melt pool tracks in IN625 samples, providing valuable data for the development and benchmarking of models and simulations of the LPBF process. The findings indicate that the morphology created by steady-state melt pool propagation varies stochastically about a mean position or shape, with distribution parameters that depend on the build conditions.
研究不足
The study focuses on single autogenous laser tracks on smooth bare metal surfaces, which simplifies the process but does not account for the stochastic nature of the powder layer and its properties in actual LPBF processes. Additionally, the study does not address the effects of post-build heat treatments on the microstructure and properties of the tracks.
1：Experimental Design and Method Selection
The study involved creating autogenous laser melt pool tracks in IN625 samples using two different types of LPBF machines with similar laser power and speed settings. The surface topography of these tracks was measured and quantified using confocal laser scanning microscopy.
2：Sample Selection and Data Sources
Samples were cut from 3.2 mm thick plate of alloy 625. Initially, samples were prepared with four different surface finishes: as-received (mill finish), bead blasted, polished using standard metallurgical procedures to a randomly oriented, 320-grit finish using light pressure, and polished using standard metallurgical procedures to a randomly oriented 320-grit finish using moderate pressure.
3：List of Experimental Equipment and Materials
The equipment used included the National Institute of Standards and Technology Additive Manufacturing Metrology Testbed (AMMT) and a commercial AM machine (EOS M270 modified at NIST). The confocal scanning laser microscope (CLSM) used was a Zeiss LSM 800 with ConfoMaps ST 7.4 software.
4：Experimental Procedures and Operational Workflow
Laser melt pool tracks were created in the samples using two different LPBF systems. The surface topography of these tracks was measured and quantified using CLSM. The imaging conditions and analysis procedures were standardized across all samples.
5：Data Analysis Methods
The recorded image files were interpolated into surface data that were imported into the commercial topographic analysis software. The surface analysis software was used to examine the tracks as they were acquired, and the analysis was repeated using exactly the same procedures for all tracks.
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