Characterisation of grain boundary cluster compactness in austenitic stainless steel

Salaheddin Rahimi, Dirk Engelberg, James Marrow

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9 Citations (Scopus)

Abstract

The distribution of grain boundaries of particular crystallographic character can provide descriptive information on the properties of engineering materials. For example, the fraction and connectivity of corrosion susceptible grain boundaries typically correlates with the extent of intergranular corrosion and stress corrosion cracking resistance in sensitised austenitic stainless steels. A parameter defining the cluster compactness is proposed to describe the breakup of the network of corrosion susceptible grain boundaries. It may therefore provide a measure of intergranular stress corrosion cracking resistance. The cluster compactness of the network of random grain boundaries (.S29) in electron backscatter diffraction assessments of micro-structure is shown to decrease with increasing fraction of S3 boundaries. However, the cluster compactness of the network of corroded grain boundaries identified after electrochemical testing is less sensitive to changes in microstructure obtained by thermomechanical processing.
Original languageEnglish
Pages (from-to)670-675
Number of pages6
JournalMaterials Science and Technology
Volume26
Issue number6
DOIs
Publication statusPublished - 2010

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Keywords

  • sensitisation
  • stainless steel
  • cluster characteristic
  • grain boundary engineering
  • electron backscatter diffraction

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