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Correlation Between Microstructure and Corrosion Behavior of the Dissimilar Joints of Incoloy 800HT and P91 Steel Using GTAW Process

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Abstract

Incoloy 800HT and P91 steel were welded with two different filler materials (ERNiCr-3 and ER505) by the GTAW process. The microstructure of the two different weldments was examined by using optical microscope (OM) and scanning electron microscope (SEM). The corrosion behaviors of the base metals and welded joints were assessed by electrochemical corrosion studies. Microstructural analysis revealed that ERNiCr-3 filler-based weld showed equiaxed grains with columnar dendritic structure, whereas the ER505 filler-based weld had a mixed cellular and dendritic structure. An unmixed zone was found between the interface and the weld on the Incoloy 800HT side, whereas Type I and Type II boundaries were found on the P91 steel side. Due to the formation of chromium-rich M23C6 precipitates, a chromium-depleted zone was created near the grain boundary that deteriorated the corrosion resistance of the ER505 weld. Meanwhile, the ERNiCr-3 weld exhibited higher corrosion resistance due to the significant inclusion of Ni and Cr components.

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Authors and Affiliations

  1. Department of Mechanical Engineering, SRM TRP Engineering College, Tiruchirappalli, Tamilnadu, 621105, India

    V. Lakshmanan & T. Arunnellaiappan

  2. Department of Production Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu, 620015, India

    P. Sathiya

  3. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    N. Jeyaprakash

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  1. V. Lakshmanan
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  2. P. Sathiya
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  3. T. Arunnellaiappan
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  4. N. Jeyaprakash
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Correspondence to V. Lakshmanan.

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Lakshmanan, V., Sathiya, P., Arunnellaiappan, T. et al. Correlation Between Microstructure and Corrosion Behavior of the Dissimilar Joints of Incoloy 800HT and P91 Steel Using GTAW Process. Trans Indian Inst Met 77, 685–696 (2024). https://doi.org/10.1007/s12666-023-03156-0

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