| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
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| Presentation Title |
Effect of Pores Aspect Ratio on Prior â-Grain Refinement in AM Ti6Al4V with Hot Isostatic Pressure |
| Author(s) |
Vivek Kumar Sahu, Nipa Lutfun, Hector R Siller, Herman Shen |
| On-Site Speaker (Planned) |
Vivek Kumar Sahu |
| Abstract Scope |
Additively manufactured L-PBF Ti6Al4V is highly valued in aerospace application for its cost-effective production of complex-shaped components. Its microstructure characterized by porosity with different aspect ratio and large columnar prior β-grain with a strong solidification <001> fiber texture, influenced by process parameters. Low energy density leads lack of fusion, causing un-melted powder and the formation of irregular, high-aspect-ratio wedge-shaped pores. Conversely, high energy density results in nearly unit aspect ratio gas pores. Theses microstructural features cause mechanical anisotropy and plastic heterogeneity, leading to uncertainty in the failure. Hot isostatic pressing (HIP) is employed to close pores and improve mechanical properties by altering the microstructure. In this study, microstructures with irregular wedge-shaped and gas pores were HIPed above the β-transus temperature to reduce porosity and refine prior β-grains. Detailed correlative studies using large area EBSD, X-ray tomography and FEM simulations assessed the extant of β-grain refinement at different pore aspect ratios. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Other |