研究目的
Investigating the cracking behavior and control of β-solidifying Ti-40Al-9V-0.5Y alloy produced by selective laser melting (SLM), focusing on the influence factors for cracking sensitivity, cracking behavior, and crack inhibition mechanism.
研究成果
The study successfully fabricated a crack-free β-solidifying Ti-40Al-9V-0.5Y alloy using SLM, with favorable mechanical properties. The cracking behavior and inhibition mechanism were elucidated, showing that microstructure characteristics and phase transformations controlled by cooling rate determine the alloy's ductility. The findings contribute to the understanding of SLM processing for γ-TiAl alloys and suggest potential for further optimization.
研究不足
The study focuses on a specific alloy composition and SLM process parameters. The findings may not be directly applicable to other alloy systems or manufacturing processes. The research also highlights the need for further optimization to reduce porosity and improve mechanical properties.
1：Experimental Design and Method Selection:
The study used selective laser melting (SLM) to fabricate Ti-40Al-9V-0.5Y alloy samples under different process parameters, focusing on scanning velocity as the major variable.
2：5Y alloy samples under different process parameters, focusing on scanning velocity as the major variable.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Spherical gas atomized Ti-40Al-9V-0.5Y alloy powders were used as the starting material. Single tracks and cylinder samples were deposited using various parameters.
3：5Y alloy powders were used as the starting material. Single tracks and cylinder samples were deposited using various parameters.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A self-developed SLM machine (LSNF-I) was used for the experiments. High-speed camera (Phantom V2012) for recording the cooling process, and various analytical tools for microstructure and phase analysis.
4：Experimental Procedures and Operational Workflow:
Samples were built on pure Ti substrate in an argon atmosphere. The cooling process was recorded, and solidification time was measured. Microstructure and phase characteristics were analyzed using OM, SEM, EBSD, EPMA, and XRD.
5：Data Analysis Methods:
Crack density and porosity were evaluated using image analysis software. Microhardness and compression tests were performed to assess mechanical properties.
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