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On the m23 c6-carbide in 2205 duplex stainless steel: An unexpected (m23 c6 /austenite)—eutectoid in the d-ferritic matrix
dc.contributor.author | Redjaïmia, Abdelkrim |
dc.contributor.author | Mateo García, Antonio Manuel |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials |
dc.date.accessioned | 2021-10-14T11:07:08Z |
dc.date.available | 2021-10-14T11:07:08Z |
dc.date.issued | 2021-09-01 |
dc.identifier.citation | Redjaïmia, A.; Mateo, A. On the m23 c6-carbide in 2205 duplex stainless steel: An unexpected (m23 c6 /austenite)—eutectoid in the d-ferritic matrix. "Metals", 1 Setembre 2021, vol. 11, núm. 9, p. 1340:1-1340:22. |
dc.identifier.issn | 2075-4701 |
dc.identifier.uri | http://hdl.handle.net/2117/353543 |
dc.description.abstract | This study is focused on isothermal and anisothermal precipitation of M23C6 carbides from the fully ferritic structure of the (¿ + d) austenitic-ferritic duplex stainless steel X2CrNiMo2253, (2205). During isothermal heat treatments, small particles of K-M23C6 carbide precipitates at the d/d grain-boundaries. Their formation precedes ¿ and s-phases, by acting as highly potential nucleation sites, confirming the undertaken TEM investigations. Furthermore, anisothermal heat treatment leads to the formation of very fine islands dispersed throughout the fully d-ferritic matrix. TEM characterization of these islands reveals a particular eutectoid, reminiscent of the well-known (¿-s)—eutectoid, usually encountered in this kind of steel. TEM and electron microdiffraction techniques were used to determine the crystal structure of the eutectoid constituents: ¿-Austenite and K-M23C6 carbides. Based on this characterization, orientation relationships between the two latter phases and the ferritic matrix were derived: cube-on-cube, on one hand, between K-M23C6 and ¿-Austenite and Kurdjumov-Sachs, on the other hand, between ¿-Austenite and the d-ferritic matrix. Based on these rational orientation relationships and using group theory (symmetry analysis), the morphology and the only one variant number of K-M23C6 in ¿-Austenite have been elucidated and explained. Thermodynamic calculations, based on the commercial software ThermoCalq® (Thermo-Calc Software, Stockholm, Sweden), were carried out to explain the K-M23C6 precipitation and its effect on the other decomposition products of the ferritic matrix, namely ¿-Austenite and s-Sigma phase. For this purpose, the mole fraction evolution of K-M23C6 and s-phase and the mass percent of all components entering in their composition, have been drawn. A geometrical model, based on the corrugated compact layers instead of lattice planes with the conservation of the site density at the interface plane, has been proposed to explain the transition d-ferrite ¿ {¿-Austenite ¿ K-M23C6}. |
dc.language.iso | eng |
dc.publisher | Multidisciplinary Digital Publishing Institute (MDPI) |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International |
dc.rights | ©2021 MDPI |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
dc.subject | Àrees temàtiques de la UPC::Enginyeria dels materials |
dc.subject.lcsh | Stainless steel |
dc.subject.other | Duplex stainless steels |
dc.subject.other | M23C6 carbide |
dc.subject.other | Crystal structure |
dc.subject.other | (M23C6/¿)-eutectoid |
dc.subject.other | Morphology |
dc.subject.other | Geometrical model |
dc.subject.other | Mechanism |
dc.subject.other | Thermodynamic calculations |
dc.title | On the m23 c6-carbide in 2205 duplex stainless steel: An unexpected (m23 c6 /austenite)—eutectoid in the d-ferritic matrix |
dc.type | Article |
dc.subject.lemac | Acer inoxidable |
dc.subject.lemac | Estructura cristal·lina |
dc.contributor.group | Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials |
dc.identifier.doi | 10.3390/met11091340 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | https://www.mdpi.com/2075-4701/11/9/1340 |
dc.rights.access | Open Access |
local.identifier.drac | 32067480 |
dc.description.version | Postprint (published version) |
local.citation.author | Redjaïmia, A.; Mateo, A. |
local.citation.publicationName | Metals |
local.citation.volume | 11 |
local.citation.number | 9 |
local.citation.startingPage | 1340:1 |
local.citation.endingPage | 1340:22 |
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