Formation of intergranular M 23 C 6 in sensitized type-347 stainless steel

Tatsuya Fukunaga, Kenji Kaneko, Rika Kawano, Kakeru Ueda, Kazuhiro Yamada, Nobuo Nakada, Masao Kikuchi, Jonathan Simon Barnard, Paul Anthony Midgley

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Formation of intergranular M 23 C 6 carbides and thereafter Cr-depletion zones in commercially available type-347 stainless steels were observed by optical microscopy, conventional transmission electron microscopy and analytical transmission electron microscopy. At the early stage of sensitization, only NbC carbides were observed both intragranularly and intergranularly. At the later stage, formation of intergranular M 23 C 6 carbides and intergranular corrosion were found. A model is proposed to describe the formation kinetics of intergranular precipitation of NbC and of M 23 C 6 , as well as Cr-depletion zones, thermodynamically. Evolution mechanisms of intergranular precipitates were found in the order of 1) the formation of intergranular NbC, 2) the coarsening of NbC, 3) the formation of M 23 C 6 , then 4) the coarsening of M 23 C 6 and formation of Cr-depletion zones.

Original languageEnglish
Pages (from-to)148-152
Number of pages5
Journalisij international
Volume54
Issue number1
DOIs
Publication statusPublished - Feb 26 2014

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Stainless Steel
Carbides
Stainless steel
Coarsening
Transmission electron microscopy
Optical microscopy
Precipitates
Corrosion
Kinetics

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Fukunaga, T., Kaneko, K., Kawano, R., Ueda, K., Yamada, K., Nakada, N., ... Midgley, P. A. (2014). Formation of intergranular M 23 C 6 in sensitized type-347 stainless steel isij international, 54(1), 148-152. https://doi.org/10.2355/isijinternational.54.148

Formation of intergranular M 23 C 6 in sensitized type-347 stainless steel . / Fukunaga, Tatsuya; Kaneko, Kenji; Kawano, Rika; Ueda, Kakeru; Yamada, Kazuhiro; Nakada, Nobuo; Kikuchi, Masao; Barnard, Jonathan Simon; Midgley, Paul Anthony.

In: isij international, Vol. 54, No. 1, 26.02.2014, p. 148-152.

Research output: Contribution to journalArticle

Fukunaga, T, Kaneko, K, Kawano, R, Ueda, K, Yamada, K, Nakada, N, Kikuchi, M, Barnard, JS & Midgley, PA 2014, ' Formation of intergranular M 23 C 6 in sensitized type-347 stainless steel ', isij international, vol. 54, no. 1, pp. 148-152. https://doi.org/10.2355/isijinternational.54.148
Fukunaga, Tatsuya ; Kaneko, Kenji ; Kawano, Rika ; Ueda, Kakeru ; Yamada, Kazuhiro ; Nakada, Nobuo ; Kikuchi, Masao ; Barnard, Jonathan Simon ; Midgley, Paul Anthony. / Formation of intergranular M 23 C 6 in sensitized type-347 stainless steel In: isij international. 2014 ; Vol. 54, No. 1. pp. 148-152.
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