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Effect of Nickel Content on the Microstructural, Mechanical and Corrosion Behavior of E7018-G Electrode Weld Metal

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Abstract

The versatility and variety of covered electrodes introduce shielded metal arc welding (SMAW) as the most industrial applicable process. In the current research, inter-relationship between nickel (Ni) contents, microstructure, mechanical properties and corrosion behavior of E7018-G deposited weld metal (WM) were investigated. Optical and scanning electron microscopy studies revealed that increasing Ni content of WM up to 1.2 wt.% raises area fraction of acicular ferrite (increasing from 32 up to 62%) at the expense of other morphologies of ferrite, such as polygonal, widmanstätten and grain boundary ferrite in the WM. Tensile and charphy impact tests revealed the critical effect of Ni on the tensile and impact strength of WM, i.e., increasing Ni content up to 1.2 wt.% improves tensile strength (from 543 MPa up to 596 MPa) and impact toughness (from 56 J up to 111 J) of WM, while higher Ni contents of WM (>1.2 wt.%) had slightly detrimental effect on the mechanical strengths of WM. The similar variations were observed in the corrosion behavior of WM as a function of Ni contents.

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Acknowledgments

The authors gratefully acknowledge the technical support from the Yazd Electrode company, especially Eng. Asgari as CEO, Dr. Fakheri as R&D manager and technical personnel such as Eng. Omani, Eng. Bagheri and Eng. Rasti.

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  1. Department of Mining and Metallurgy, Engineering Faculty, Yazd University, Yazd, Iran

    Masoud Mosallaee & Milad Toghraei Semiromi

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  1. Masoud Mosallaee
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  2. Milad Toghraei Semiromi
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Correspondence to Masoud Mosallaee.

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Mosallaee, M., Semiromi, M.T. Effect of Nickel Content on the Microstructural, Mechanical and Corrosion Behavior of E7018-G Electrode Weld Metal. J. of Materi Eng and Perform 30, 8901–8912 (2021). https://doi.org/10.1007/s11665-021-06100-9

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  • DOI: https://doi.org/10.1007/s11665-021-06100-9

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