研究目的
To establish the effect of heat treatment on the microstructure of products obtained by direct laser deposition using a titanium alloy Ti-6Al-4V.
研究成果
1. At annealing temperatures of 600–650 °C, the microstructure is heterogeneous with individual grains of the b-phase preserved. 2. Increasing the temperature to 800–900 °C makes the structure more homogeneous and changes the dimensions of the metastable a0-phase plates. 3. Increasing the annealing time to 4 hours also contributes to a more homogeneous structure. 4. Microhardness slightly decreases after heat treatment but remains within a specific range.
研究不足
The study focuses on the microstructure and microhardness changes due to heat treatment but does not extensively cover the mechanical properties or performance under operational conditions.
1：Experimental Design and Method Selection:
Annealing of samples was carried out in different modes, where the time and annealing temperature varied. The microstructure of the products was studied using optical microscopy and microhardness was measured.
2：Sample Selection and Data Sources:
Ti-6Al-4V powder with a particle size distribution of 65–125 mm is used. Samples were manufactured on a robotic complex for Direct Laser Deposition.
3：List of Experimental Equipment and Materials:
Robotic complex for Direct Laser Deposition, based on the laser LS-5; muffle furnace with a digital microprocessor temperature controller SNOL 3/11; optical microscope (DMI 5000 (Leica) with the Tixomet software; microhardness tester 'MICROHARDNESS TESTER FM-31000'.
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Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Samples were annealed in a muffle furnace with varying time and temperature. The microstructure was studied and microhardness was measured.
5：Data Analysis Methods:
The microstructure was analyzed using optical microscopy and microhardness values were measured and compared.
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