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Studies on the effect of process parameter on corrosion behaviour of electron beam welded Ti-based alloy (Ti6Al4V)

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Abstract

The present work concerns understanding the effect of process parameters on the corrosion behavior (in a 3.56 wt.% NaCl Solution) of electron beam welded Ti6Al4V developed with an acceleration voltage of 60 kV, beam current varying from 42–48 mA, and welding speed ranging from 800–1000 mm/min. In addition, beam oscillation (1–2 mm) was employed for the samples processed with an applied voltage of 900 mm/min and beam current of 45 mA. Electron beam welding leads to the formation of defect-free welding with the presence of α, α' martensite, and a few β phases in the microstructure. A detailed electron backscattered diffraction study shows that the area fractions of low/high angle grain boundaries vary with process parameters. The average Kernal misorientation angle of the electron beam welded samples varies from 0.49°-0.57° as compared to 0.40° for as-received Ti6Al4V. Potentiodynamic polarization study in a 3.5 wt.% NaCl solution shows a superior corrosion resistance for the samples welded with beam oscillation as compared to the case without any oscillation. Electrochemical impedance spectroscopy measurement reveals the formation of a complex passivating film on the oxide surface. The X-ray photoelectron spectroscopy (XPS) analysis of the post-corroded samples shows the presence of titanium oxide (rutile and anatase) on the surface in the case of electron beam welded samples as compared to only anatase in as-received Ti6Al4V.

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Data availability

Data used in the present study are available in the manuscript only. Extra data if required is available on request.

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Acknowledgements

The authors would like to express appreciation for the support of the technical staff of IIT, Kharagpur in preparing the electron beam-welded Ti6Al4V samples as well as in characterisation. The partial financial support from the Board of Research in Nuclear Science (BRNS) (to JDM) and the Ministry of Human Resource Development (to JS) is gratefully acknowledged. Partial financial support from Alexander von Humboldt Foundation (Friedrich Wilhelm Bessel Award Scheme to JDM) is also gratefully acknowledged. Characterisation facility support from the Central Research facility, IIT Kharagpur is fully acknowledged.

Funding

The partial financial support from the Board of Research in Nuclear Science (BRNS) (to JDM) and the Ministry of Human Resource Development (to JS) is gratefully acknowledged. Partial financial support from Alexander von Humboldt Foundation (to JDM) is also gratefully acknowledged.

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Authors and Affiliations

  1. Metallurgical and Materials Engineering Department, IIT Kharagpur, Kharagpur, India

    Jeetendra Kumar Singh, Gour Gopal Roy & Jyotsna Dutta Majumdar

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by JKS. The first draft of the manuscript was written by JKS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jyotsna Dutta Majumdar.

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Singh, J.K., Roy, G.G. & Majumdar, J.D. Studies on the effect of process parameter on corrosion behaviour of electron beam welded Ti-based alloy (Ti6Al4V). Weld World 67, 2731–2747 (2023). https://doi.org/10.1007/s40194-023-01599-z

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