Formation of Intergranular M23C6 in Sensitized Type-347 Stainless Steel
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, onl...
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| Veröffentlicht in: | ISIJ International 2014/01/15, Vol.54(1), pp.148-152 |
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| creator | Fukunaga, Tatsuya Kaneko, Kenji Kawano, Rika Ueda, Kakeru Yamada, Kazuhiro Nakada, Nobuo Kikuchi, Masao Barnard, Jonathan Simon Midgley, Paul Anthony |
| description | 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 M23C6 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. |
| doi_str_mv | 10.2355/isijinternational.54.148 |
| format | Article |
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At the early stage of sensitization, only NbC carbides were observed both intragranularly and intergranularly. At the later stage, formation of intergranular M23C6 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.</description><identifier>ISSN: 0915-1559</identifier><identifier>EISSN: 1347-5460</identifier><identifier>DOI: 10.2355/isijinternational.54.148</identifier><language>eng</language><publisher>Tokyo: The Iron and Steel Institute of Japan</publisher><subject>Applied sciences ; carbides ; Exact sciences and technology ; Metals. 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At the early stage of sensitization, only NbC carbides were observed both intragranularly and intergranularly. At the later stage, formation of intergranular M23C6 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.</description><subject>Applied sciences</subject><subject>carbides</subject><subject>Exact sciences and technology</subject><subject>Metals. 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Metallurgy</topic><topic>precipitation</topic><topic>sensitization</topic><topic>TEM</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fukunaga, Tatsuya</creatorcontrib><creatorcontrib>Kaneko, Kenji</creatorcontrib><creatorcontrib>Kawano, Rika</creatorcontrib><creatorcontrib>Ueda, Kakeru</creatorcontrib><creatorcontrib>Yamada, Kazuhiro</creatorcontrib><creatorcontrib>Nakada, Nobuo</creatorcontrib><creatorcontrib>Kikuchi, Masao</creatorcontrib><creatorcontrib>Barnard, Jonathan Simon</creatorcontrib><creatorcontrib>Midgley, Paul Anthony</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>ISIJ International</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fukunaga, Tatsuya</au><au>Kaneko, Kenji</au><au>Kawano, Rika</au><au>Ueda, Kakeru</au><au>Yamada, Kazuhiro</au><au>Nakada, Nobuo</au><au>Kikuchi, Masao</au><au>Barnard, Jonathan Simon</au><au>Midgley, Paul Anthony</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Formation of Intergranular M23C6 in Sensitized Type-347 Stainless Steel</atitle><jtitle>ISIJ International</jtitle><addtitle>ISIJ Int.</addtitle><date>2014-01-01</date><risdate>2014</risdate><volume>54</volume><issue>1</issue><spage>148</spage><epage>152</epage><pages>148-152</pages><issn>0915-1559</issn><eissn>1347-5460</eissn><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 M23C6 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.</abstract><cop>Tokyo</cop><pub>The Iron and Steel Institute of Japan</pub><doi>10.2355/isijinternational.54.148</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Applied sciences carbides Exact sciences and technology Metals. Metallurgy precipitation sensitization TEM |
| title | Formation of Intergranular M23C6 in Sensitized Type-347 Stainless Steel |
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