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C-curves for lengthening of Widmanstätten and Bainitic ferrite
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48, no 9, p. 3997-4005Article in journal (Refereed) Published
Abstract [en]

Widmanstätten ferrite and bainitic ferrite are both acicular and their lengthening rate in binary Fe-C alloys and low-alloyed steels under isothermal conditions is studied by searching the literature and through new measurements. As a function of temperature, the lengthening rate can be represented by a common curve for both kinds of acicular ferrite in contrast to the separate C-curves often presented in time-temperature-transformation (TTT) diagrams. The curves for Fe-C alloys with low carbon content show no obvious decrease in rate at low temperatures down to 623 K (350 ͦC). For alloys with higher carbon content, the expected decrease of rate as a function of temperature below a nose was observed. An attempt to explain the absence of a nose for low carbon contents by an increasing deviation from local equilibrium at high growth rates is presented. This explanation is based on a simple kinetic model, which predicts that the growth rates for Fe-C alloys with less than 0.3 mass pct carbon are high enough at low temperatures to make the carbon pileup, in front of the advancing tip of a ferrite plate, shrink below atomic dimensions, starting at about 600 K (323 ͦC).

Place, publisher, year, edition, pages
2017. Vol. 48, no 9, p. 3997-4005
National Category
Materials Engineering Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-227693OAI: oai:DiVA.org:kth-227693DiVA, id: diva2:1205199
Available from: 2018-05-11 Created: 2018-05-11 Last updated: 2018-05-11

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  • apa
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  • nn-NB
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