研究目的
The present work studied the densification, microstructure and mechanical properties of nano-TiC reinforced Inconel 718 composites processed by selective laser melting (SLM) with variation of laser energy linear density (E).
研究成果
The SLM process was successfully applied to fabricate nano-TiC reinforced Inconel 718 nanocomposites with tailored microstructure and performance. The study concluded that the densification behavior, microstructure evolution, and mechanical properties of the composites were significantly influenced by the laser energy linear density (E). Optimal mechanical performance was achieved at an E of 300 J/m, demonstrating the potential of SLM technology in processing high-temperature nickel-based superalloys with complex configurations.
研究不足
The study focused on the effects of laser energy linear density (E) on the densification, microstructure, and mechanical properties of SLM-processed TiC/Inconel 718 nanocomposites. The limitations include the specific range of E values used (225 to 300 J/m) and the focus on nano-TiC reinforcements, which may not cover all potential variations in material compositions or processing parameters.
1：Experimental Design and Method Selection:
The study involved the use of selective laser melting (SLM) to process nano-TiC reinforced Inconel 718 composites with variation of laser energy linear density (E).
2：Sample Selection and Data Sources:
Spherical gas-atomized Inconel 718 with a size of 10–50 μm and polygonal TiC powder with an average size of about 50 nm were used. The composite powders containing 10 wt% TiC were prepared by high energy ball milling.
3：List of Experimental Equipment and Materials:
The SLM processing was carried out using a SLM-150 device, which consists of a YLR-500-WC ytterbium fiber laser with a laser power of ～500 W and a spot size of 70 μm, automatic powder spreading system, inert argon gas protection system, and a computer system for process control.
4：Experimental Procedures and Operational Workflow:
The laser beam selectively melted the powder layer by layer according to the CAD data, using a linear scan pattern. The process was repeated until the bulk parts were constructed.
5：Data Analysis Methods:
The density of SLM-processed specimens was measured by Archimedes principle. The microstructure was characterized by an optical microscope (OM) and a field emission scanning electron microscope (FE-SEM). The chemical composition was examined by an energy dispersive spectrometer (EDS).
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