Insights into the influence of cold rolling and accelerated isothermal aging on microstructure evolution, corrosion performance, σ precipitation and its kinetics in a low molybdenum Fe-21Cr-5Mn-1.5Ni alloy

Tushar R. Dandekar, Raoof Koya K S, Jitendra Chavhan, Rajik Shah, Rajesh K. Khatirkar

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Abstract

In the present work, effect of cold rolling and accelerated isothermal aging at 800 °C on the microstructural changes and corrosion behavior in a low molybdenum Fe-21Cr-5Mn-1.5Ni alloy has been investigated. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and electron backscattered diffraction (EBSD) were used to investigate the changes in microstructure and σ precipitation, while the corrosion behavior was studied using anodic polarization tests and electrochemical impedance spectroscopy (EIS). The corrosion resistance followed the given sequence – Solution annealed (undeformed) > 50% cold rolled + aged 72 h > solution annealed (undeformed) + aged 72 h > 50% cold rolled. Corrosion products were mainly oxides of iron and chromium.

Original languageEnglish
Article number101814
Number of pages12
JournalMaterialia
Volume30
Early online date23 Jun 2023
DOIs
Publication statusPublished - 1 Aug 2023

Keywords

  • aging
  • corrosion
  • EBSD
  • Fe-Cr-Mn-Ni Alloy
  • σ precipitation: SIM

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