Abstract
This paper details the first study of castable nanostructured alloy (CNA) steel gas tungsten arc weldability and the post-weld heat treatment (PWHT) effects. Effects of welding heat input, thermal cycles, and PWHT on microstructures, microhardness distributions, room temperature tensile properties, and fracture characteristics are discussed. Results show that CNA steel exhibits excellent weldability (i.e., no indication of welding defects and reasonable tensile properties). The welded joint exhibited heterogeneous microstructures with δ-ferrite as well as large microhardness variation and fluctuation. The welded joint yield and ultimate tensile strengths were similar to those of the base metal, but the elongations decreased by 30 %. However, with normalization and tempering PWHT, the δ-ferrite was eliminated, microstructure was modified, hardness was unified, and joint ductility was restored. The study indicated that the CNA reduced-activation ferritic-martensitic steel owns excellent weldability, and PWHT is needed for the industrial application of welded structures.
| Original language | English |
|---|---|
| Article number | 155860 |
| Journal | Journal of Nuclear Materials |
| Volume | 613 |
| DOIs | |
| State | Published - Jul 2025 |
Funding
This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US 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 US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doepublic-access-plan). This research is sponsored by the DOE Office of Fusion Energy Sciences under contract DE-AC05-00OR22725 with UT-Battelle LLC, with additional support by DOE Advanced Research Projects Agency–Energy (ARPA-E) 20/CJ000/08/06. The authors gratefully acknowledge Yiyu Wang for technical discussion, Doug Kyle for GTAW, Alan Frederick for specimen cutting, Sarah Graham for metallographic specimens’ preparation, Kelsey Epps for tensile testing, Jessica Osborne for radiographic test, along with assistance from people at ORNL, and technical review by Yiyu Wang and QQ Ren at ORNL. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US 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 US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doepublic-access-plan ). This research is sponsored by the DOE Office of Fusion Energy Sciences under contract DE-AC05-00OR22725 with UT-Battelle LLC, with additional support by DOE Advanced Research Projects Agency–Energy (ARPA-E) 20/CJ000/08/06 .
Keywords
- CNA steel
- Mechanical property
- Microstructure
- Post weld heat treatment
- Weldability
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