| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
|
| Presentation Title |
Microstructure Evolution Effects from Variable Preheat Temperature in Laser Powder-bed Fusion of Ti-6Al-4V |
| Author(s) |
Evan B. Adcock, Anthony Rollett |
| On-Site Speaker (Planned) |
Evan B. Adcock |
| Abstract Scope |
Laser powder-bed fusion introduces rapid temperature changes in processing and specific thermal histories can be impacted by printing parameters and part geometry. These complex interactions significantly alter microstructure outcomes and this study seeks to study this phenomenon in Ti-6Al-4V. An “inverted pyramid” part was developed to generate variability in thermal history throughout the build by restricting bulk conduction while layer size increased. This geometry caused elevation in subsequent layer preheat from greater heat accumulation. Microstructure and texture results have been analyzed by X-ray diffraction, backscatter scanning electron microscopy, and micro-hardness. Trends in α morphology evolution have been observed relative to the induced layer preheat temperature due to changing cooling rates. Further builds for analysis have been planned with controlled stage preheat to evaluate thermal history with greater precision. Process monitoring data will be used to calibrate a process prediction model for phase outcomes in Ti-6Al-4V printed via laser powder-bed fusion. |