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Early stages of cementite precipitation during tempering of 1C-1Cr martensitic steel
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0003-4825-7430
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0003-1102-4342
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0003-3598-2465
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Abstract [en]

The precipitation of cementite (M3C) from as-quenched martensite during tempering at 500 and 700 °C was investigated in a Fe–1C–1Cr (wt. %) alloy. Tempering for a short duration at 700 °C results in a Cr/Fe ratio in the core region of M3C precipitates which is equal to the bulk alloy composition, while a shell on the surface of the precipitates exhibit a higher Cr concentration. With a prolonged tempering up to 5 hours, the shell concentration gradually increases towards the equilibrium value but the core region has not yet reached the equilibrium value. After tempering for 5 seconds at 500 °C, there is no Cr enrichment found at the M3C/matrix interface, while a transition to partitioning of Cr is found during the first 5 minutes of tempering at 500 °C. These experimental results indicate that M3C grows without significant partitioning of substitutional elements at both temperatures initially, i.e. growth is carbon diffusion controlled. This stage is, however, very short, and soon after 5 seconds at 700 °C and 5 min at 500 °C, Cr diffusion becomes important. Calculations using the diffusion simulation software DICTRA and precipitation simulation software TC-PRISMA were performed. The diffusion simulations using the local equilibrium interface condition show excellent agreement with experiments concerning Cr enrichment of the particles, but the size evolution is overestimated. On the other hand, the precipitation simulations underestimate the size evolution. It is suggested that a major improvement in the precipitation model could be achieved by implementing a modified nucleation model that considers nucleation far from the equilibrium composition.

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URN: urn:nbn:se:kth:diva-233448OAI: oai:DiVA.org:kth-233448DiVA, id: diva2:1239928
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QC 20180821

Tilgjengelig fra: 2018-08-20 Laget: 2018-08-20 Sist oppdatert: 2019-08-21bibliografisk 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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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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