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<p>Significant work has been done on the analysis of microstructure and texture in Ti6Al4V parts with simple geometric shapes like cubes or cylinders manufactured using laser powder bed fusion (LPBF). However, in recent times, there has been considerable interest in the use of triply periodic minimum surfaces (TPMS) in additive manufacturing (AM) in the production of titanium-based lattices for hard tissue applications. The present work utilizes a diamond TPMS lattice-based tensile specimen to explore the geometry-dependent variation in microstructure and preferred crystallographic orientations in relation to the observed tensile behaviour. Three regions within a single tensile specimen namely lattice region (LR), lattice-solid junction region (L-SR) and solid region (SR) were studied. The results indicated a change in the aspect ratio of the martensitic lath from ~ 5 in the LR to 3.8 in the SR within an individual as-built specimen. Moreover, the texture strength was considerably higher in LR as compared to SR. The texture for the as-built LR was noted to be arrested in progression to form a &lt; 0001 &gt;|| build direction (B.D) crystallographic orientation. The underdeveloped texture in the LR was completed to form a &lt; 0001 &gt;||B.D preferred orientation and was further intensified by the heat treatment (HT) done at 750&#xa0;°C for 4&#xa0;h and 920&#xa0;°C for 2&#xa0;h followed by furnace cooling. An improvement in the ductility was observed for both the HT processes and is mainly attributed to the coarsening of grains and β-phase with negligible impact of the texture within the LR on the ductility of the specimens.</p> Graphic Abstract <p></p>

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Characterizing Geometry Dependent Microstructure and Texture in Titanium Lattice Structure Manufactured by Laser Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Shivank A. Tyagi,
  • M. Manjaiah,
  • Kudakwashe Nyamuchiwa,
  • Clodualdo Aranas Jr.

摘要

Significant work has been done on the analysis of microstructure and texture in Ti6Al4V parts with simple geometric shapes like cubes or cylinders manufactured using laser powder bed fusion (LPBF). However, in recent times, there has been considerable interest in the use of triply periodic minimum surfaces (TPMS) in additive manufacturing (AM) in the production of titanium-based lattices for hard tissue applications. The present work utilizes a diamond TPMS lattice-based tensile specimen to explore the geometry-dependent variation in microstructure and preferred crystallographic orientations in relation to the observed tensile behaviour. Three regions within a single tensile specimen namely lattice region (LR), lattice-solid junction region (L-SR) and solid region (SR) were studied. The results indicated a change in the aspect ratio of the martensitic lath from ~ 5 in the LR to 3.8 in the SR within an individual as-built specimen. Moreover, the texture strength was considerably higher in LR as compared to SR. The texture for the as-built LR was noted to be arrested in progression to form a < 0001 >|| build direction (B.D) crystallographic orientation. The underdeveloped texture in the LR was completed to form a < 0001 >||B.D preferred orientation and was further intensified by the heat treatment (HT) done at 750 °C for 4 h and 920 °C for 2 h followed by furnace cooling. An improvement in the ductility was observed for both the HT processes and is mainly attributed to the coarsening of grains and β-phase with negligible impact of the texture within the LR on the ductility of the specimens.

Graphic Abstract