| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Study of the Role of Beam Scan Strategies on the Microstructure and Mechanical Properties of EBM Additively Manufactured Ti-6Al-4V Builds |
| Author(s) |
Meiyue Shao, Sriram Vijayan, Sabina Kumar, Sudarsanam Babu, Joerg Jinschek |
| On-Site Speaker (Planned) |
Meiyue Shao |
| Abstract Scope |
In electron-beam-melting powder-bed fusion (EBM-PBF) process, variations in beam scan strategies allow localized control over the thermal signatures (thermal gradients and cooling rates) in the material during the build process, thereby controlling the local microstructure in additively manufactured (AM) builds. Here, we compare the effect of three different EBM scan strategies (raster scan, spot-ordered fill and random spot fill strategy) to build three identical 15 x 15 x 25 mm3 Ti-6Al-4V blocks. The microstructure and texture throughout the build were analyzed using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The analysis revealed statistically significant variations in alpha lath thickness, prior beta grain size and distribution of α/α grain boundaries (GBs). Site specific microhardness measurements were correlated with the microstructural features from the corresponding region. Furthermore, the structure and composition of the dominant α/α GBs observed in the three Ti-6Al-4V blocks were characterized using scanning/transmission electron microscopy (S/TEM). |
| Proceedings Inclusion? |
Planned: |