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Activation energy for isothermal martensite in ferrous alloys
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-7656-9733
KTH, Superseded Departments, Materials Science and Engineering.
1997 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 45, no 2, 651-662 p.Article in journal (Refereed) Published
Abstract [en]

The experimental information on isothermal α martensite in ferrous alloys is reviewed. From the kinetics one can clearly distinguish between three groups of alloys yielding isothermal martensite. The first group contains high alloy steels with a low Ms temperature. They form isothermal martensite with a temperature dependence corresponding to a very low activation energy, possibly 7 kJ/mol. The second group contains steels with an appreciable amount of carbon. Its rate of formation of isothermal martensite can be explained by assuming that it is triggered by submicroscopic plates of bainite formed with a rate controlled by carbon diffusion. The third group contains Fe---Ni alloys with up to about 25% Ni. There the temperature dependence corresponds to an activation energy of about 80 kJ/mol. It is proposed that their transformation is related to the transformation causing plateau II in experiments with very rapid cooling, a transformation which has previously been proposed to be related to the formation of bainite.

Place, publisher, year, edition, pages
1997. Vol. 45, no 2, 651-662 p.
Keyword [en]
Activation energy; Bainite; Carbon; Diffusion; Martensite; Martensitic transformations; Reaction kinetics; Steel; Thermal effects; Ferrous alloy; High alloy steel; Isothermal martensite; Iron alloys
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-12508DOI: 10.1016/S1359-6454(96)00186-3ISI: A1997WF44300022OAI: oai:DiVA.org:kth-12508DiVA: diva2:315649
Note
QC 20100429Available from: 2010-04-29 Created: 2010-04-29 Last updated: 2011-02-07Bibliographically approved
In thesis
1. Nucleation and growth of martensite in steel
Open this publication in new window or tab >>Nucleation and growth of martensite in steel
1997 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 1997. 41 p.
Keyword
martensite, Fe-alloys, α-martensite, athermal martensite, isothermal martensite, plate martensite, lath martensite, nucleation, growth, thermodynamics, plateau temperature, driving force, activation energy, bainite, Widmanstätten α, diffusive mechanism, displacive mechanism, ε-martensite
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-2583 (URN)91-7170-201-6 (ISBN)
Public defence
1997-11-28, 00:00 (English)
Note
QC 20100429Available from: 2000-01-01 Created: 2000-01-01 Last updated: 2010-04-29Bibliographically approved

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