Abstract
Reduced-activation ferritic/martensitic (RAFM) steels are an important class of structural materials for fusion reactor internals developed in recent years because of their improved irradiation resistance. However, they can suffer from welding induced property degradations. In this paper, a solid phase joining technology friction stir welding (FSW) was adopted to join a RAFM steel Eurofer’97 and different FSW parameters/heat input were chosen to produce welds. FSW response parameters, joint microstructures and microhardness were investigated to reveal relationships among welding heat input, weld structure characterization and mechanical properties. In general, FSW heat input results in high hardness inside the stir zone mostly due to a martensitic transformation. It is possible to produce friction stir welds similar to but not with exactly the same base metal hardness when using low power input because of other hardening mechanisms. Further, post weld heat treatment (PWHT) is a very effective way to reduce FSW stir zone hardness values.
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References
P. Fernandez et al., “Metallurgical Characterization of the Reduced Activation Ferritic/Martensitic Steel Eurofer’97 on As-received Condition,” Fusion Engineering and Design, 58–59(2001) 787 — 792.
Sanghoon Noh et al., “Microstructural Evolutions of Friction Stir Welded F82H Steel for Fusion Applications,” (Paper presented at the Transactions of the Korean Nuclear Society Autumn Meeting, Gyeongju, Korea, October 25 — 26, 2012), 2.
Zhenzhen Yu et al., “Similar and Dissimilar Friction Stir Welding of ODS and RAFM Steels,” (Paper presented at)
Tanigawa et al., “Technical Issues of Reduced Activation Ferritic/Martensitic Steels for Fabrication of ITER Test Blanket Modules,” Fusion Engineering and Design, 83 (2008) 1471 — 1476.
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© 2015 TMS (The Minerals, Metals & Materials Society)
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Tang, W., Chen, J., Yu, X., Frederick, D.A., Feng, Z. (2015). Heat Input and Post Weld Heat Treatment Effects on Reduced-Activation Ferritic/Martensitic Steel Friction Stir Welds. In: Mishra, R.S., Mahoney, M.W., Sato, Y., Hovanski, Y. (eds) Friction Stir Welding and Processing VIII. Springer, Cham. https://doi.org/10.1007/978-3-319-48173-9_9
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DOI: https://doi.org/10.1007/978-3-319-48173-9_9
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48604-8
Online ISBN: 978-3-319-48173-9
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