Formation of intergranular M23C6 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

doi:10.2355/isijinternational.54.148

Formation of intergranular M₂₃C₆ 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

研究成果: Contribution to journal › Article › 査読

16 被引用数 (Scopus)

抄録

Formation of intergranular M₂₃C₆ 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 ₂₃C₆ carbides and intergranular corrosion were found. A model is proposed to describe the formation kinetics of intergranular precipitation of NbC and of M₂₃C₆, 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 M₂₃C₆, then 4) the coarsening of M₂₃C₆ and formation of Cr-depletion zones.

本文言語	英語
ページ（範囲）	148-152
ページ数	5
ジャーナル	isij international
巻	54
号	1
DOI	https://doi.org/10.2355/isijinternational.54.148
出版ステータス	出版済み - 2014

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

文献へのアクセス

10.2355/isijinternational.54.148

他のファイルとリンク

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引用スタイル

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title = "Formation of intergranular M23C6 in sensitized type-347 stainless steel",

abstract = "Formation of intergranular M23C6 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 23C6 carbides and intergranular corrosion were found. A model is proposed to describe the formation kinetics of intergranular precipitation of NbC and of M23C6, 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 M23C6, then 4) the coarsening of M23C6 and formation of Cr-depletion zones.",

author = "Tatsuya Fukunaga and Kenji Kaneko and Rika Kawano and Kakeru Ueda and Kazuhiro Yamada and Nobuo Nakada and Masao Kikuchi and Barnard, {Jonathan Simon} and Midgley, {Paul Anthony}",

year = "2014",

doi = "10.2355/isijinternational.54.148",

language = "English",

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journal = "Transactions of the Iron and Steel Institute of Japan",

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T1 - Formation of intergranular M23C6 in sensitized type-347 stainless steel

AU - Fukunaga, Tatsuya

AU - Kaneko, Kenji

AU - Kawano, Rika

AU - Ueda, Kakeru

AU - Yamada, Kazuhiro

AU - Nakada, Nobuo

AU - Kikuchi, Masao

AU - Barnard, Jonathan Simon

AU - Midgley, Paul Anthony

PY - 2014

Y1 - 2014

N2 - Formation of intergranular M23C6 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 23C6 carbides and intergranular corrosion were found. A model is proposed to describe the formation kinetics of intergranular precipitation of NbC and of M23C6, 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 M23C6, then 4) the coarsening of M23C6 and formation of Cr-depletion zones.

AB - Formation of intergranular M23C6 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 23C6 carbides and intergranular corrosion were found. A model is proposed to describe the formation kinetics of intergranular precipitation of NbC and of M23C6, 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 M23C6, then 4) the coarsening of M23C6 and formation of Cr-depletion zones.

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