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Quantitative modeling and experimental verification of carbide precipitation in a martensitic Fe-0.16 wt%C-4.0 wt%Cr alloy
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi. Northeastern University, China.ORCID-id: 0000-0003-4825-7430
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. (ENHETEN STRUKTURER)ORCID-id: 0000-0003-1102-4342
Vise andre og tillknytning
2016 (engelsk)Inngår i: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 53, s. 39-48Artikkel i tidsskrift (Fagfellevurdert) Published
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Text
Abstract [en]

Precipitation of carbides during tempering of a martensitic Fe-0.16 wt% C-4.0 wt% Cr alloy has been investigated by experimental analysis and quantitative modeling. It is found that both M7C3 and M23C6 form, at low- and high-angle grain boundaries in the martensite, as well as, at dislocations inside individual laths of martensite, during tempering at 700 °C. The applied Kampmann-Wagner numerical (KWN) modeling, utilizing CALPHAD thermodynamic and kinetic databases together with an assumption of local equilibrium and a constant tie-line, captures the main features of the precipitation, with a transient formation of metastable M23C6, and with M7C3 as the stable carbide. The predicted volume fraction and size are in reasonable agreement with extraction experiments for M7C3. However, for the metastable minority carbide M23C6, the modeling underestimates the size and overestimates the volume fraction within the transient time. With sound thermodynamic databases and physical parameter input, the adopted simplified modeling scheme is a valuable tool for materials design and optimization. Furthermore, by treating conditions at the phase interface more rigorously it is possible to account for different mechanisms of precipitation, such as e.g., non-partitioning local equilibrium, which could be important in systems where interstitial elements diffuse much faster than the substitutional ones.

sted, utgiver, år, opplag, sider
Elsevier, 2016. Vol. 53, s. 39-48
Emneord [en]
Electron microscopy, Microstructure, Modeling, Precipitation, Steels, Tempering, Carbides, Chromium alloys, Grain boundaries, Martensite, Models, Phase interfaces, Steel, Volume fraction, Carbide precipitation, Different mechanisms, Experimental analysis, Experimental verification, High angle grain boundaries, Interstitial elements, Quantitative modeling, Thermodynamic database, Precipitation (chemical)
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Identifikatorer
URN: urn:nbn:se:kth:diva-186937DOI: 10.1016/j.calphad.2016.03.001ISI: 000377315100005Scopus ID: 2-s2.0-84960155147OAI: oai:DiVA.org:kth-186937DiVA, id: diva2:929367
Merknad

Funding Details: U1260204, NSFC, National Natural Science Foundation of China

QC 20160518

Tilgjengelig fra: 2016-05-18 Laget: 2016-05-16 Sist oppdatert: 2018-08-21bibliografisk kontrollert
Inngår i avhandling
1. An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys
Åpne denne publikasjonen i ny fane eller vindu >>An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2018. s. 59
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Identifikatorer
urn:nbn:se:kth:diva-233502 (URN)978-91-7729-843-4 (ISBN)
Disputas
2018-09-14, sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20180821

Tilgjengelig fra: 2018-08-21 Laget: 2018-08-21 Sist oppdatert: 2020-05-11bibliografisk kontrollert

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