研究目的
Exploring spatial laser modulation to enhance the properties and processability of AM metals, demonstrating control of the columnar-to-equiaxed transition, identifying methods to reduce surface roughness, and extending processing windows for AM alloys.
研究成果
Beam ellipticity demonstrated a strong effect on solidification microstructure, producing equiaxed or mixed equiaxed-columnar grains over a larger parameter space than circular profiles. This indicates that grain morphology can be tailored by varying beam intensity spatial profile, enabling site-specific properties in additively manufactured parts.
研究不足
The study focuses on single-track experiments and the effects of beam ellipticity on microstructure. The applicability to full builds and other materials needs further investigation.
1：Experimental Design and Method Selection:
Single-track laser melting experiments were completed using 316L stainless steel powder on 316L stainless steel substrates. A custom LPBF testbed was used with a 600 W fiber laser, collimated and directed through an anamorphic prism pair to adjust beam ellipticity, then through a reducer to a galvanometer scanner.
2：Sample Selection and Data Sources:
316L stainless steel powder and substrates were used.
3：List of Experimental Equipment and Materials:
JK600 FL fiber laser (JK Lasers), anamorphic prism pair (Thor Labs), 2-5x reducer (Thor Labs), galvanometer scanner (Nutfield Technologies).
4：Experimental Procedures and Operational Workflow:
The chamber was evacuated and back-filled with argon. Laser melting was performed with Ar pressure maintained at 750 Torr.
5：Data Analysis Methods:
Finite element modeling of the melt pool dynamics and thermal profiles using LLNL’s ALE3D code.
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