研究目的
Investigating the effect of laser parameters on microstructure and phase evolution of Ti-Si-C composites prepared by selective laser melting.
研究成果
The study demonstrated that selective laser melting can fabricate Ti-Si-C composites with varying phases and microstructures by adjusting laser parameters. Higher laser energy density promotes densification and suppresses balling. The method offers potential for manufacturing gradient composite parts for various applications without additional powder feeding apparatus.
研究不足
The study is limited by the decomposition of SiC and poor sinterability during laser irradiation, which affects the densification of Ti-Si-C composites. The nonequilibrium cooling in the laser melting process also limits the transformation of metallic phases.
1：Experimental Design and Method Selection:
The study used selective laser melting (SLM) to process blended Ti/SiC powder. SEM, EDS, TEM, and XRD were employed to evaluate microstructure and phase evolution.
2：Sample Selection and Data Sources:
Raw powder consisted of SiC and Ti powders with specific properties. Samples were fabricated with varying laser powers and scanning speeds.
3：List of Experimental Equipment and Materials:
HK-M125 machine equipped with Nd:YAG laser, Quanta650 FESEM, Mastersizer 3000 particle size analyzer, XRD-7000s X-ray diffractometer, Tecnai G2 F30 FSTEM.
4：Experimental Procedures and Operational Workflow:
Laser parameters were varied to investigate their influence. Samples were characterized for microstructure, phase composition, and elemental distribution.
5：Data Analysis Methods:
Phase compositions were determined by XRD, microstructure and elemental analysis by SEM and TEM, and porosity by the Archimedes method.
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