Journal of Ultrafine Grained and Nanostructured Materials

Journal of Ultrafine Grained and Nanostructured Materials

Quantifying the dependency of uniform corrosion of structural steel on grain size

Document Type : Research Paper

Authors
Maryam Soleimani
Hamed Mirzadeh
Changiz Dehghanian
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
10.22059/jufgnsm.2019.02.09
Abstract
The dependency of uniform corrosion of structural steel on the average grain size (D) should be quantified for design purposes. In the present work, a spectrum of grain sizes was obtained by simple heat treatment routes in st37 structural steel. It was revealed that the corrosion current density (icorr) increased by grain refinement, which was related to the increased density of grain boundaries. The data on the plots of hardness and icorr versus 1/√D were successfully fitted by a straight line and an exponential function, respectively. Therefore, the mechanical response was rationalized by a Hall-Petch type relationship with a slope of 237.8 MPa/µm0.5. Moreover, the obtained simple relationship between icorr and 1/√D can be used for prediction of the dependency of uniform corrosion on the average grain size.
Keywords
Structural steel
Corrosion resistance
Grain size
Hall-Petch law
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Journal of Ultrafine Grained and Nanostructured Materials
Volume 52, Issue 2
December 2019
Pages 206-209

  • Receive Date 19 November 2019
  • Revise Date 07 December 2019
  • Accept Date 09 December 2019