研究目的
Investigating the effect of laser energy density on the phase change, density, microstructure, Vickers hardness, and tensile properties within the ASHM specimens.
研究成果
The study concluded that the highest Vickers microhardness, the largest tensile strength, and the attendant ductility were gained at ψ =222 J/mm3, which was attributed to the high density and relatively fine grains. The findings may pave the way for optimizing the ψ used in manufacturing SS parts to obtain materials with finer grain sizes and better mechanical behaviors.
研究不足
The study acknowledges that some degrees of defects such as porosity, balling, and hot cracking were associated with the selection of unsuitable laser processing parameters, thereby decreasing the densification level of 316L SS parts.
1：Experimental Design and Method Selection:
The study involved the use of additive/subtractive hybrid manufacturing (ASHM) technology to build 316L SS specimens, focusing on the effect of laser energy density (ψ) on various properties.
2：Sample Selection and Data Sources:
Gas-atomized AISI 316L powder was used as the starting material, with a particle size distribution from 10 to 130 um.
3：List of Experimental Equipment and Materials:
The ASHM machine (SVW80C-3D) was used, which consists of a five-axis CNC milling equipment and an IPG YLS-2000 high-power fiber laser. The material used was AISI 316L powder.
4：Experimental Procedures and Operational Workflow:
The study involved the fabrication of bulk rectangle samples with dimensions of 110 × 5 × 10 mm3 by the ASHM method to investigate the influence of processing parameters on the porosity, microstructure, and mechanical behaviors.
5：Data Analysis Methods:
The microstructures of the 316L powder and ASHM-processed specimens were performed by the X-ray diffraction (XRD) technique. The degree of densification was examined according to the Archimedes theory. Vickers hardness measurements were performed using a 430SVD Vickers hardness testing machine.
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