Abstract
Dissimilar joints between ferritic and austenitic steels are of interest for selected applications in next generation fast reactors. In this study, dissimilar friction-stir welding of an 11 pct Cr ferritic/martensitic steel to a 316 austenitic stainless steel was attempted and the mechanical properties and microstructure of the resulting welds were examined. Friction-stir welding produces a stir zone without macroscopic weld-defects, but the two dissimilar steels are not intermixed. The two dissimilar steels are interleaved along a sharp zigzagging interface in the stir zone. During small-sized tensile testing of the stir zone, this sharp interface did not act as a fracture site. Furthermore, the microstructure of the stir zone was refined in both the ferritic/martensitic steel and the 316 stainless steel resulting in improved mechanical properties over the adjacent base material regions. This study demonstrates that friction-stir welding can produce welds between dissimilar steels that contain no macroscopic weld-defects and display suitable mechanical properties.
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Acknowledgments
The authors are grateful to Mr. M. Kitamura, Mr. A. Honda, Mr. S. Fukushi, Prof. I. Ohnuma, and Dr. K. Kobayashi of Tohoku University for the preparation of specimens and testing. They also wish to thank Prof. T. Shibayama of Hokkaido University for their valuable discussions. A part of this study is the result of “Friction stir welding of the wrapper tube materials for Na fast reactors”, carried out under the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Sato, Y.S., Kokawa, H., Fujii, H.T. et al. Mechanical Properties and Microstructure of Dissimilar Friction Stir Welds of 11Cr-Ferritic/Martensitic Steel to 316 Stainless Steel. Metall Mater Trans A 46, 5789–5800 (2015). https://doi.org/10.1007/s11661-015-3152-5
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DOI: https://doi.org/10.1007/s11661-015-3152-5