A5023133662- Additive Manufacturing Materials and Processes
- Titanium Alloys Microstructure and Properties
- High Entropy Alloys Studies
- Nuclear Materials and Properties
- High-Temperature Coating Behaviors
- Intermetallics and Advanced Alloy Properties
- Fusion materials and technologies
Northwestern Polytechnical University
2022-2024
The achievement of fine equiaxed β grain with conventional intragranular (α-Ti+β-Ti) microstructure in additive manufacturing titanium alloy remains a big challenge. We conquer this challenge by synergistically controlling β-grains during both solidification and subsequent thermal-cycles laser directed energy deposition (DED), solution + quenching heat-treatment. Both the strength plasticity heat-treated Ti6Al4V3Ni0.05B are superior to those reported new DED comparable that Ti6Al4V, because...
The refinement of β grains is an effective approach to optimize the grain boundary α phase and enhance mechanical properties for laser‐directed energy deposited (L‐DED) titanium alloys. In this study, primary size refined by adding 0.05 0.10 wt% boron in Ti55531, respectively. It was found that addition trace can not only reduce during molten pool solidification process, but also suppress coarsening in‐situ thermal cycling process. Ti55531 + 0.05B alloy exhibited higher strength elongation....
In order to achieve strength-plasticity matching and improve fracture toughness of near β titanium alloy Ti55531 fabricated by laser directed energy deposition (LDED), the heat-treated microstructure corresponding tensile properties were investigated. Microstructure evolution during heat treatment deformation behavior mechanical testing analyzed. The results showed that primary grains approximately equiaxed with weak texture in LDED-built Ti55531. After subcritical solution single/double...