The defining role of interface crystallography in corrosion of a two-phase pearlitic steel

M. I. Khan, H. K. Mehtani, A. Durgaprasad, G. K. Goyal, M. J.N.V. Prasad, S. Parida, T. Dasgupta, N. Birbilis, I. Samajdar*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    This study involved thermomechanically processed fine (few hundred nanometers of interlamellar spacing) pearlite wire rods of the different axial alignment of the pearlite colonies, and coarse (several micron interlamellar spacing) pearlite colonies. In the former, appropriate microstructural tailoring, and corresponding axial alignment, reduced the corrosion rate, in chloride solution, by nearly 6.4 times. In the coarse pearlite, on the other hand, dissolution and aqueous corrosion, influenced by microgalvanic coupling, was shown to be restricted to the ferrite side of the ferrite-cementite interface. The orientation relationship between ferrite and cementite determined localised corrosion. In summary, remarkable improvements in the resistance to galvanic corrosion were shown, in coarse two-phase pearlite, by enhancing the population of good-fit interfaces. Though the same observation was not possible, experimentally, in the fine pearlite colonies, the remarkable improvement in the corrosion resistance of aligned pearlite wire rods appears real and extremely reproducible.

    Original languageEnglish
    Pages (from-to)1439-1453
    Number of pages15
    JournalPhilosophical Magazine
    Volume100
    Issue number11
    DOIs
    Publication statusPublished - 2 Jun 2020

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