About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
|
Presentation Title |
In-situ X-ray, IR, and Diffraction Measurements of Automotive Grade Steel During Laser Powder Bed Fusion |
Author(s) |
Andrew Bobel, Louis G Hector, Benjamin Gould, Sarah Wolff |
On-Site Speaker (Planned) |
Andrew Bobel |
Abstract Scope |
The effects of laser process parameters on melt pool and vapor cavity dynamics, thermal evolution, and transient phase transformations in additively manufactured automotive grade steels was studied. The dynamic melting process of commonly used automotive grade 4140 steel was examined using high-speed X-ray imaging concurrently with high-resolution thermal IR imaging. The laser energy and scan speed using continuous wave laser mode were explored. The thermal profiles of the additively built material were then correlated with analogous high-speed in-situ diffraction studies to extract the transient phase transformations characteristic to this low alloy steel during the rapid melt and solidification cycles accompanying the additive manufacturing process. These results will provide an accurate mathematical expression of laser heat source (e.g. Goldak’s double-ellipsoid heat source) for a finite element based model. The model will be utilized to develop automotive grade materials and process parameters/strategies with minimal defects and higher process throughput. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |