Abstract
A new technique to calculate spatial variations of grain shape, grain size, and grain boundary curvature in the fusion zone (FZ) of refractory metal alloys has been developed. This technique was applied to quantitatively evaluate changes in microstructures of simulated molybdenum welds available in the literature. Use of this technique showed that a 50% increase in weld speed more than doubled the fraction of grain segments oriented between 0° and 30° to the normal to the weld direction along with a decrease in grain size from approximately 120 µm to 84 µm in the weld direction at the FZ centerline.
| Original language | English |
|---|---|
| Pages (from-to) | 62-67 |
| Number of pages | 6 |
| Journal | Scripta Materialia |
| Volume | 182 |
| DOIs | |
| State | Published - Jun 2020 |
Funding
This work was sponsored by the United States Department of Energy Office of Nuclear Facilities Management (NE-31). The primary funding for this work was provided by the NASA Science Mission Directorate. The authors wish to thank Theron M. Rodgers, John A. Mitchell, and Veena Tikare for granting permission to use their calculated microstructures for this study and for providing additional information on their simulation approach. The authors would also like to thank Andrew Martin Stine, Stanley W. Pierce, and Paul F. Moniz for granting permission to use the microstructures and weld pool shapes of their experimental molybdenum welds [15]. This work was sponsored by the United States Department of Energy Office of Nuclear Facilities Management (NE-31). The primary funding for this work was provided by the NASA Science Mission Directorate. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains, and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan).
| Funders | Funder number |
|---|---|
| DOE Public Access Plan | |
| United States Department of Energy Office of Nuclear Facilities Management | NE-31 |
| United States Government | |
| Veena Tikare | |
| U.S. Department of Energy | |
| National Aeronautics and Space Administration | DE-AC05-00OR22725 |
Keywords
- Grain boundary curvature
- Grain shape
- Grain size
- Microstructural analysis
- Weld speed