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Physical Simulation of Thermally Induced Martensite Formation from Retained austenite in TRIP Steels

Journal of Materials Science & Technology 2003年第Z1期19卷 105-108页

作者： Lie ZHAO Fred J. VERMOLEN Jilt SIETSMA Sybrand van der ZWAAG Netherlands Institute for Metals Research P.O.Box 5008 2600 GA Delft The Netherlands Department of Materials Science Delft University of Technology R otterdamseweg 137 2628 AL Delft The Netherlands Department of Applied Mathematics Delft University of Technology Mekelweg 4 2628 CD Delft The Netherlands Department of Materials ScienceDelft University of TechnologyRotterdamseweg 1372628 AL DelftThe Netherlands Netherlands Institute for Metals Research P.O.Box 5008 2600 GA Delft The Netherlands Faculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 2629 HS Delft The Netherlands

The present work analyses the total free energy of the material during the martensitic transformation. A general expression for the martensite fraction as a function of temperature is derived, assuming that the nonchemical free energyis proportional to the volume of martensite. This expression indicates that the temperature-dependent martensitefraction can be predicted once the characteristic transformation temperatures and the relation between the chemicalfree energy and temperature of the martensite and austenite are known. An advantage of this development is thatthe proposed equation is valid for all types of relations between the chemical free energy and temperature. Thissimulation is successfully applied to the martensitic transformation upon further cooling of retained austenite in alow-alloyed TRIP steel, in which the relation between chemical free energy and temperature is quadratic and thefraction is determined from a thermo-magnetic measurement.

关键词： Thermodynamics, Martensitic transformation, Retained austenite, TRIP steels.

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Static Recrystallization Behavior of Hot Deformed austenite for Micro-Alloyed Steel

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Journal of Materials Science & Technology 2003年第Z1期19卷 117-118页

作者： Jie HUANG Zhou XU Xin XING Key Laboratory for High Temperature Materials and Tests of Ministry of Education Shanghai Jiaotong UniversityShanghai 200030 China Key Laboratory for High Temperature Materials and Tests of Ministry of Education Shanghai Jiaotong UniversityShanghai 200030 China Key Laboratory for High Temperature Materials and Tests of Ministry of Education Shanghai Jiaotong UniversityShanghai 200030 China

Static recrystallization behavior of austenite for micro-alloyed steel during hot rolling was studied and the influence (τ-ε diagram) of holding time and deformation at different deformations and isothermal temperatures on microstructuralstate of austenite were discussed. Corresponding to parameter Z in the dynamic recrystallization diagram, parameterY was then introduced to simplify static recrystallization diagrams.

关键词： Micro-alloyed steel, Hot deformation of austenite, Static recrystallization

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