| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Powder Materials Processing and Fundamental Understanding
|
| Presentation Title |
Evolution of Microstructure and Defects in Laser Powder Bed Fused Alloys after Hot Isostatic Pressing |
| Author(s) |
Penn Rawn, Le Zhou |
| On-Site Speaker (Planned) |
Penn Rawn |
| Abstract Scope |
Hot isostatic press (HIP) has been proven effective in improving the density of laser powder bed fused (LPBF) metals that are subjected to internal defects. To further understand the defect closure kinetics, HIP was performed on as-built LPBF alloys with various initial defect morphology and fraction. In this study, representative LPBF alloys, including Ti6Al4V, AlSi10Mg and Cu were manufactured with different processing parameters. This resulted in keyhole pores and lack of fusion defects with distinct morphology and size distribution. The density of the as-built and HIP’ed alloys was determined by Archimedes' principle and image analysis of the cross-sections. The morphology and distribution of defects were quantitatively analyzed by optical microscopy and X-ray microtomography. The microstructure was characterized by scanning electron microscopy. The effectiveness of HIP in closing defects other than gas pores was discussed with respect to the HIP mechanisms, which has important implications on future optimization of HIP parameters. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, |