Effectiveness of an intercritical heat-treatment on localized corrosion resistance at the microstructural boundaries of medium-carbon steels

Mariko Kadowaki, Izumi Muto, Hideki Katayama, Hiroyuki Masuda, Yu Sugawara, Nobuyoshi Hara

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The localized corrosion resistance at the microstructural boundaries of AISI 1045 carbon steels was accessed. Under KFM measurements, regions with low corrosion potentials were found at the pearlite colony boundary in the ferrite-pearlite structure and the prior austenite grain boundary in the martensite structure, and phosphorus was segregated in these regions. The localized corrosion resistance at these boundaries was improved via intercritical heat-treatment at 1023 K (the two-phase region of austenite and ferrite)after austenitizing, which may be attributable to the apparently homogenous dissolution of ferrite forming elements, such as phosphorus, in the ferrite phase during the treatment.

Original languageEnglish
Pages (from-to)159-177
Number of pages19
JournalCorrosion Science
Volume154
DOIs
Publication statusPublished - 2019 Jul 1

Keywords

  • Carbon steel
  • Pitting corrosion
  • Polarization

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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