Microstructure and mechanical properties of friction welded carbon steel (EN24) and nickel-based superalloy (IN718)

V.T. Gaikwad; M.K. Mishra; V.D. Hiwarkar; R.K.P. Singh

doi:10.1007/s12613-020-2008-1

Volume 28 Issue 1

Jan. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(1): 111-119

V.T. Gaikwad, M.K. Mishra, V.D. Hiwarkar, and R.K.P. Singh, Microstructure and mechanical properties of friction welded carbon steel (EN24) and nickel-based superalloy (IN718), Int. J. Miner. Metall. Mater., 28(2021), No. 1, pp. 111-119. https://doi.org/10.1007/s12613-020-2008-1

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V.T. Gaikwad, M.K. Mishra, V.D. Hiwarkar, and R.K.P. Singh, Microstructure and mechanical properties of friction welded carbon steel (EN24) and nickel-based superalloy (IN718), Int. J. Miner. Metall. Mater., 28(2021), No. 1, pp. 111-119. https://doi.org/10.1007/s12613-020-2008-1

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Research Article

Microstructure and mechanical properties of friction welded carbon steel (EN24) and nickel-based superalloy (IN718)

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Corresponding author:
V.T. Gaikwad E-mail: prajwalvijay75@gmail.com
Received: 23 November 2019; Revised: 2 February 2020; Accepted: 10 February 2020; Available online: 11 February 2020

Abstract

Abstract

Continuous-drive rotary friction welding was performed to join cylindrical specimens of carbon steel (EN24) and nickel-based superalloy (IN718), and the microstructures of three distinct weld zones—the weld interface (WI)/thermo-mechanically affected zone (TMAZ), the heat-affected zone (HAZ), and the base metal—were examined. The joint was observed to be free of defects but featured uneven flash formation. Electron backscatter diffraction (EBSD) analysis showed substantial changes in high-angle grain boundaries, low-angle grain boundaries, and twin boundaries in the TMAZ and HAZ. Moreover, significant refinement in grain size (2–5 μm) was observed at the WI/TMAZ with reference to the base metal. The possible causes of these are discussed. The microhardness profile across the welded joint shows variation in hardness. The changes in hardness are ascribed to grain refinement, phase transformation, and the dissolution of strengthening precipitates. The tensile test results reveal that a joint efficiency of 100% can be achieved using this method.
- friction welding;
- dissimilar metals;
- EN24;
- IN718;
- microstructure;
- mechanical properties

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