研究目的
To investigate the evolution of microstructure in a B4C reinforced Ti matrix composite fabricated via direct laser deposition, focusing on the in-situ reactions between Ti and B4C during the process.
研究成果
The study concludes that TiB precipitates are the initial reaction product during the LENS process, acting as heterogeneous nucleation sites for TiC precipitates, which in turn nucleate fine β-Ti grains. These findings provide a comprehensive understanding of the sequence of in-situ reactions and microstructure evolution in Ti-B4C composites fabricated via direct laser deposition.
研究不足
The study is limited by the difficulty in probing the localized thermodynamics and kinetics within the laser-material interaction region during the LENS process due to the extremely narrow volume of the interaction region and short interaction time.
1：Experimental Design and Method Selection:
The study utilized the laser engineered net shaping (LENS) process for direct laser deposition of Ti and B4C mixtures.
2：Sample Selection and Data Sources:
Commercially pure Titanium (CP-Ti) powders mixed with Boron Carbide (B4C) powders were used as feedstock.
3：List of Experimental Equipment and Materials:
A LENS system equipped with a 1500 W Nd: YAG laser, producing near-infrared radiation with a wavelength of
4：064 μm, and four independently controlled powder hoppers. Experimental Procedures and Operational Workflow:
Depositions were carried out with specific processing parameters including laser power, beam diameter, scanning rate, layer spacing, and hatch width.
5：Data Analysis Methods:
Microstructural characterization was performed using XRD, SEM equipped with EBSD and EDS, TEM, and microhardness testing.
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