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Effect of Heat Input on Mechanical and Electrochemical Properties of Electron-Beam-Welded Inconel 718

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Abstract

In the present study, electron-beam welding (bead on plate) of solution-treated Inconel 718 alloy with a thickness of 3 mm has been carried out using a constant acceleration voltage of 70 kV and welding speed of 2000 mm/min under varied currents of 45, 57 and 67 mA, respectively. Process parameters are varied so as to obtain the heat input in three discrete levels, i.e., 94.6, 120 and 140.6 J/mm, respectively. Surface roughness is found to vary from 0.75 μm of as-received Inconel 718 to 61-77 μm for electron-beam-welded Inconel 718 and is increased with an increase in heat input. The microstructure of the weld zone consists of equiaxed and dendritic morphology. Electron-beam welding leads to improvement in microhardness (to 318-466 VHN) as compared to the base metal (278 VHN), which is attributed to refinement of microstructure. Corrosion rate in a 3.56 wt.% NaCl solution was found to be increased from 0.23 mm/year for base metal to 0.24-0.52 mm/year for the weld zone. The nano-hardness value was found to be increased from 2.2 GPa for the base metal to 2.6 GPa for the weld zone. The yield strength of the welded samples was decreased to 691 MPa as compared to 1100 MPa for the base metal which is possibly attributed to the presence of micro-defects and precipitates. The percentage elongation (%) was decreased to 7.18% as compared to 25% of the base metal.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India

    Sumit K. Sharma, K. Biswas & J. Dutta Majumdar

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  1. Sumit K. Sharma
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  2. K. Biswas
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  3. J. Dutta Majumdar
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Correspondence to J. Dutta Majumdar.

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Sharma, S.K., Biswas, K. & Majumdar, J.D. Effect of Heat Input on Mechanical and Electrochemical Properties of Electron-Beam-Welded Inconel 718. J. of Materi Eng and Perform 29, 1706–1714 (2020). https://doi.org/10.1007/s11665-020-04660-w

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  • DOI: https://doi.org/10.1007/s11665-020-04660-w

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