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Journal of Materials Engineering and Performance

, Volume 27, Issue 4, pp 1753–1762 | Cite as

Effect of Different Cooling Rates on the Corrosion Behavior of High-Carbon Pearlitic Steel

  • Prvan Kumar Katiyar
  • Sudhir Misra
  • K. Mondal
Article

Abstract

The present work discusses the effect of pearlitic morphology on the corrosion behavior of high-carbon fully pearlitic steel in 3.5% NaCl solution. Four different types of pearlitic steels (furnace-cooled, as-received, air-cooled and forced-air-cooled) consisting of coarse, medium, fine and very fine microstructures, respectively, were tested. Electrochemical behavior of these steels was studied with the help of dynamic and linear polarization and AC impedance spectroscopic tests. The corrosion resistance improved with fineness of the microstructure in general. However, with further reduction in interlamellar spacing beyond a limit, the corrosion resistance reduced slightly. Formation of homogeneous distribution of microgalvanic cells between cementite and ferrite lamellae of fine pearlitic steel improved the corrosion resistance. However, entanglement of the lamellae of pearlite in very fine pearlitic structure as well as breaking of cementite lamellae due to finer pearlitic colonies was attributed to the higher corrosion of the forced-air-cooled steel as compared to the air-cooled steel.

Keywords

corrosion behavior heat treatment microscopy pearlite 

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringIndian Institute of TechnologyKanpurIndia
  2. 2.Department of Civil EngineeringIndian Institute of TechnologyKanpurIndia

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