研究目的
Investigating the enhancement of hardness and wear performance of laser additive manufactured Ti6Al4V alloy through achieving ultrafine microstructure.
研究成果
The study concludes that refining the microstructure of LAM-fabricated Ti6Al4V alloy to submicron-scale acicular α phases significantly enhances its hardness and wear performance. The low energy density with a high scanning speed is effective in achieving this ultrafine microstructure due to the high cooling rate of the molten pool. This method provides a promising approach for improving the mechanical properties of Ti6Al4V alloy for various industrial applications.
研究不足
The study focuses on the microstructural refinement and mechanical properties enhancement of Ti6Al4V alloy through LAM, but the scalability and cost-effectiveness of the method for industrial applications are not discussed. The study also does not explore the long-term durability and performance of the fabricated samples under real-world conditions.
1：Experimental Design and Method Selection:
The study used laser additive manufacturing (LAM) with coaxial powder feeding to fabricate Ti6Al4V samples on pure Ti plates. Two sets of samples were fabricated with different laser spot diameters, laser powers, and scanning speeds to achieve different energy densities.
2：Sample Selection and Data Sources:
Gas-atomized Ti6Al4V powders were used, with an average particle size of 50 μm.
3：List of Experimental Equipment and Materials:
A two-color pyrometer was used to record the temperature of the molten pool. Microstructures were characterized using an optical microscope (OM) and a scanning electron microscope (SEM). Phase compositions were identified by X-ray diffraction (XRD). Nano-hardness and elastic modulus were measured by a nano-indentation tester. Wear testing was performed using a tribometer.
4：Experimental Procedures and Operational Workflow:
Single-track samples were used for microstructure and hardness characterization, and multi-track specimens were used for wear tests.
5：Data Analysis Methods:
The microstructure, hardness, wear performance, and molten pool thermal behavior were analyzed to understand the relationships among processing parameters, thermal behavior, microstructure, and mechanical properties.
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