研究目的
Investigating the formation mechanism of the dilute region and microstructure evolution in laser solid forming TA15/Ti2AlNb dual alloy.
研究成果
The study successfully fabricated TA15/Ti2AlNb multiple-layer and dual-alloy samples using LSF, elucidating the forming mechanism and microstructural evolution of the dual-alloy dilute region. The compositional variation was found to be exponential, with a 'step' distribution in multiple-layer samples that becomes continuous in dual-alloy samples due to alloy elements' diffusion. The microstructure evolution showed a transition leading to significant changes in microhardness.
研究不足
The study focuses on the TA15/Ti2AlNb dual alloy fabricated by LSF, and the findings may not be directly applicable to other materials or fabrication methods. The research could be expanded to include more alloy systems and fabrication parameters.
1：Experimental Design and Method Selection
TA15/Ti2AlNb multiple-layer samples and a dual-alloy sample were fabricated by laser solid forming (LSF). The formation mechanism of the dilute region and microstructure evolution were analyzed.
2：Sample Selection and Data Sources
Pre-alloyed TA15 and Ti2AlNb spherical powders produced by the plasma rotating electrode process (PREP) were used as the deposited material. The forged TA15 plates were used as substrates.
3：List of Experimental Equipment and Materials
LSF-S6000A equipment consisting of a 6 kW continuous semiconductor laser unit, a ?ve-axis numerical control working table, and a coaxial powder feeder with four nozzle tips. The experiments were carried out in an inert gas chamber ?lled with pure argon (Ar), with oxygen (O2) content below 50 ppm.
4：Experimental Procedures and Operational Workflow
Two sets of LSF experiments were designed: Experiment 1 (E1) for the deposition of multiple-layer samples to exploit the formation mechanism of the dilute region, and Experiment 2 (E2) for the deposition of TA15/Ti2AlNb dual alloy to study the microstructure evolution and composition transition at the dilute region.
5：Data Analysis Methods
Olympus-PMG3 and Keyence VH-Z50L light microscopy (LM) were used to image the macrostructures. The TESCAN VEGALMH Scanning Electron Microscope (SEM), equipped with an energy-dispersive spectroscopy (EDS), was used to determine the microstructure and the elemental distribution.
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