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Driving force for f.c.c.→b.c.c. martensites in Fe-X 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KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-7656-9733
KTH, Superseded Departments, Materials Science and Engineering.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 5, 2079-2091 p.Article in journal (Refereed) Published
Abstract [en]

Information on Ms, the starting temperature for formation of martensite, is reviewed and one Ms line each for lath and plate martensite are drawn in a number of Fe-X phase diagrams. A reasonable interpretation of the data indicates the possibility that the distance between the two lines may vary linearly with temperature and be independent of the choice of alloying element. Using thermodynamic descriptions of the binary systems, the driving force for the start of the formation of the two kinds of martensite is calculated from the same interpretation of data. When plotted against temperature the results indicate that the driving force for martensite may not be much affected by solution hardening but may mainly be a function of temperature. For plate martensite it may have a fairly constant value of about 2100 J/mol. For lath martensite it may vary linearly, possibly from 500 J/mol at 800°C to 2100 J/mol at 250°C.

Place, publisher, year, edition, pages
1997. Vol. 45, no 5, 2079-2091 p.
Keyword [en]
Alloying elements; Binary alloys; Hardening; Iron alloys; Martensitic transformations; Phase diagrams; Thermal effects; Thermodynamic properties; Driving forces; Solution hardening; Martensite
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-12507DOI: 10.1016/S1359-6454(96)00308-4OAI: oai:DiVA.org:kth-12507DiVA: diva2:315571
Note
QC 20100429Available from: 2010-04-29 Created: 2010-04-29 Last updated: 2017-12-12Bibliographically 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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Borgenstam, Annika

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