Abstract
The solid state inertia friction welding (IFW) process was used for the first time to join two dissimilar Ni-based superalloys, LSHR, a powder metallurgy alloy, and Mar-M247, a directionally solidified alloy. Extensive studies of the microstructure, phase composition, re-distribution of the alloying elements between the welded alloys, microhardness, and welding defects were conducted at different distances from the weld interface, and the results were correlated with the loading and friction conditions during IFW. Possible reasons leading to the formation of the welding defects were discussed and directions for the further improvement of the quality of the IFW of these two dissimilar alloys were outlined.
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Acknowledgments
Inertia friction welding was conducted at the Edison Welding Institute, Columbus, Ohio. The authors thank Mr. D. Workman (EWI) for technical help. Discussions and valuable comments from Dr. S.S. Babu are greatly appreciated. ONS acknowledges financial support through the Air Force on-site contract FA8650-10-D-5226 conducted by UES, Inc., Dayton, OH.
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Manuscript submitted January 16, 2014.
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Senkov, O.N., Mahaffey, D.W., Semiatin, S.L. et al. Inertia Friction Welding of Dissimilar Superalloys Mar-M247 and LSHR. Metall Mater Trans A 45, 5545–5561 (2014). https://doi.org/10.1007/s11661-014-2512-x
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DOI: https://doi.org/10.1007/s11661-014-2512-x