研究目的
Investigating the effect of laser power variation on the microstructure during the direct energy deposition of Nb-Si based in-situ composites.
研究成果
The study concludes that increasing laser power from 500 W to 1400 W leads to significant changes in the microstructure of Nb-Si based in-situ composites, including increased volume fraction of silicides, reduction of structural heterogeneity, and stabilization of Nb5Si3 silicide. This suggests that laser power is a critical parameter in controlling the microstructure of additively manufactured Nb-Si composites.
研究不足
The study is limited to the effects of laser power on microstructure and does not extensively explore mechanical properties or long-term performance of the composites.
1：Experimental Design and Method Selection:
The study involved fabricating Nb-Si in-situ composite samples using laser metal deposition additive manufacturing technology with varying laser powers (500 W, 1000 W, 1400 W).
2：Sample Selection and Data Sources:
Blended elemental powders of Nb, Ti, Cr, Al, and Si (99.9% purity) were mechanically alloyed in an argon atmosphere for 300 minutes.
3：9% purity) were mechanically alloyed in an argon atmosphere for 300 minutes.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A Laser metal deposition (LMD) F.O.R.T. AH3000 machine, a 3 kW fiber laser, SEM Mira3 Tescan for microstructure characterization.
4：Experimental Procedures and Operational Workflow:
The metal powder was converged to the laser spot position through four coaxial feed tubes, with argon gas used for powder carrier and shielding. The laser focused on the previously deposited layer or substrate to form a molten pool, into which powders were delivered.
5：Data Analysis Methods:
The microstructure and chemical elements map were characterized using SEM Mira3 Tescan.
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