About this Abstract |
Meeting |
2021 AWS Professional Program
|
Symposium
|
2021 AWS Professional Program
|
Presentation Title |
Parameter Optimization and Simulation of High Deposition Rate Wire Arc Directed Energy Deposition of 316L |
Author(s) |
Luc Hagen, Zhenzhen Yu, Anthony Petrella, Stephen Tate, Beau Nannie, Jonah Klemm-Toole |
On-Site Speaker (Planned) |
Luc Hagen |
Abstract Scope |
The use of wire-arc directed energy deposition (WA-DED) or wire arc additive manufacturing (WAAM) is being considered as a fabrication method for pressure retaining components within nuclear power plants. Wire arc DED can be used to construct larger scale parts than other metal AM process, and the wire feed stock used is often much more economical than powder feedstock used in processes like powder bed fusion. The use of WA-DED in nuclear power plants would allow for onsite construction of replacement parts, decreasing plant down time and preventing millions of dollars in losses. However, updates to ASME code are needed before WA-DED can be used to construct large 316L stainless steel pressure retaining components.
In this presentation, we discuss our work using a high deposition rate pulsed spray transfer weld mode to construct demonstration builds with both 316L and 316L Si wire. A design of experiments (DOE) approach was used to study the effects of inter-pass temperature, weld speed, and wire composition on microstructure evolution and mechanical properties. We discuss how the results obtained in these demonstration experiments help inform the selection of processing parameters for building a large (> 200 lb) pressure retaining valve body. In addition, we discuss how an analytical model was created to predict how variations in WA-DED parameters impact solidification conditions and final microstructural and mechanical properties.
For the build parameter DOE a gas metal arc welding (GMAW) track welding system was used to construct small-scale WA-DED walls. Weld speed and inter-pass temperature was varied between two levels with each condition being built with both 316L and 316LSi wire. Once built, samples were prepared for tensile testing and microstructural studies. A heat transfer model was developed and validated using temperature data acquired during construction of the small-scale builds. This study aims to understand how build parameters impact the final microstructure and mechanical properties of parts produced with WA-DED as well as showing how WA-DED can be simulated to predict how build parameters influence the properties of WA-DED fabricated parts. |
Proceedings Inclusion? |
Definite: Other |