Abstract
Hand-tungsten inert gas welding is employed using Inconel 82 as a filler metal to weld T92 ferritic steel and HR3C austenitic steel. The microstructures of the joints are analyzed via optical and transmission electron microscopy. The corrosion resistance of the joints is evaluated via electrochemical and immersion corrosion tests, whereas the corrosion products and passive films are analyzed using scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that the weld metal region of the T92/HR3C dissimilar metal joint formed a dense passivation film containing Cr2O3 and NiO owing to the highest Cr and Ni contents, which effectively prevented the entry of chloride ions into the matrix, thus impeding corrosion and providing optimal corrosion resistance. Compared to the base material of T92, the heat-affected zone of T92 shows fine austenite grains and subgrain structures, as well as a relatively thick Cr2O3 passivation film, which improved the corrosion resistance.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 52175286), the Project of Construction and Support for high-level Innovative Teams of Beijing Municipal Institutions (BPHR20220110), and Undergraduate Research Training Program (2023J00005, 2023J00058). The authors sincerely appreciate the above financial support.
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MS: Conceptualization, Formal analysis, Writing—Original Draft, Visualization. HW: Investigation, Validation. QW: Resources, Experiment. JY: Resources, Experiment. JK: Writing—Review & Editing, Supervision, Project administration, Funding acquisition.
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Si, M., Wang, H., Wang, Q. et al. Effect of microstructure on initial corrosion behavior of T92/HR3C dissimilar metal welded joint. J Mater Sci 58, 17648–17663 (2023). https://doi.org/10.1007/s10853-023-09139-2
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DOI: https://doi.org/10.1007/s10853-023-09139-2