研究目的
To investigate the effect of Laser Energy Density (LED) on microstructure, surface morphology, and hardness of CoCr alloy processed by Selective Laser Melting (SLM), aiming to identify the optimal LED window for maximizing the overall quality of SLM parts.
研究成果
The study successfully correlated LED with density, surface quality, microstructural features, and hardness of SLM parts. Optimal LED values were identified to maximize the quality of SLM parts, with medium and high LED values yielding sound components with low porosity and high hardness.
研究不足
The study is limited to Co-28Cr-6Mo alloy and may not be directly applicable to other materials. The range of LED values and process parameters might not cover all possible scenarios in SLM processing.
1：Experimental Design and Method Selection:
SLM was used to fabricate Co-28Cr-6Mo samples with varying process parameters to achieve a wide range of LED. The study focused on surface morphology, laser tracks dimension, defects formation mechanisms, and hardness assessment.
2：Sample Selection and Data Sources:
Gas atomized CoCrMo powder was used for SLM samples production. Samples were characterized using SEM-EDS, OM, XRD, and hardness tests.
3：List of Experimental Equipment and Materials:
SLM equipment SISMA MYSINT100 with an Yb-fiber laser, SEM-EDS (Zeiss EVO 50), OM (Zeiss Imager A1), XRD (PANalytical Expert PRO), and hardness testers.
4：Experimental Procedures and Operational Workflow:
Samples were built in a nitrogen atmosphere with varying LED values. Surface and microstructural analyses were performed post-fabrication.
5：Data Analysis Methods:
Density measurements via Archimedes’ principle, surface roughness evaluation, microstructural analysis using ImageJ, and phase composition by XRD.
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