研究目的
Investigating the influence of Fe on the microstructural development of Ti-6Al-4V produced by laser powder-bed fusion to design new Ti-based alloys of superior mechanical properties.
研究成果
Fe additions up to 3 wt pct lead to significant refinement of the microstructure in Ti-6Al-4V produced by laser powder-bed fusion, without forming deleterious intermetallic compounds. The resulting microstructure can be optimized by heat treatment to achieve a desirable fully laminar a + b structure.
研究不足
The study focuses on Fe additions up to 3 wt pct, beyond which further refinement benefits are not significant. The research also highlights the challenge of achieving truly equiaxed grains due to the layer-by-layer deposition process.
1：Experimental Design and Method Selection:
The study involved adjusting alloy composition to suit the laser powder-bed fusion process, focusing on the influence of Fe. Techniques included EBSD, TEM, and in situ high-energy synchrotron X-ray diffraction.
2：Sample Selection and Data Sources:
Pre-alloyed plasma atomized Ti-6Al-4V powders were used, with Fe additions prepared by decorating the reference material with pure Fe particles.
3：List of Experimental Equipment and Materials:
Equipment included a Renishaw AM400 for manufacturing, Helios G4 PFIB UXe DualBeam Microscope for EBSD, and a Bruker D500 X-ray diffractometer.
4：Experimental Procedures and Operational Workflow:
Cubic samples were manufactured and analyzed using optical microscopy, EBSD, TEM, and XRD. Heat treatments were conducted to study microstructure decomposition.
5：Data Analysis Methods:
Data analysis involved EBSD maps, XRD spectra analysis, and TEM imaging to understand the microstructure and phase transformations.
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