About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Correlative Microscopy and Microstructural Characterization of Porosity Induced by Contouring in a Selective Laser Melted AA6061 Alloy |
Author(s) |
Hamidreza T-Sarraf, Sridhar Niverty, Arun Singaravelu, Nikhilesh Chawla |
On-Site Speaker (Planned) |
Hamidreza T-Sarraf |
Abstract Scope |
Selective Laser Melting (SLM) is an excellent near-net shape technique for manufacturing alloys and composites. Improving surface quality and densification is important for the development of SLM. Boundary re-melting or contouring, in which the same slice is scanned twice before recoating powders, offers a solution to improve the surface quality. In this study, we conducted a quantitative correlative study to investigate the effect of contouring on microstructure and porosity of AA6061-RAM2 using X-ray micro-computed tomography, and Electron Backscatter Diffraction. 3D x-ray tomography showed that contouring modifies the surface finish yet induces porosity under the surface. During re-melting, a wider melt pool allows formation of keyholes on the melting tracks and entrapped gas pores around the laser line. In addition, correlative microscopy revealed that ceramic particles were refined due to contouring. The effect of processing on 3D microstructural evolution will be discussed in detail. |
Proceedings Inclusion? |
Definite: Other |