[en] In this work, an evaluation method to calculate the austenite fraction during continuous heating and isothermal annealing from dilatometric data is proposed. By means of a single reference measurement to determine a scaling factor correcting for experimental errors, a framework is created to determine the austenite fraction as a function of time and temperature. In the evaluation of the dilatometric data the effect of the changing carbon concentration in austenite phase is taken into account. The method is applied to dilatometric data for a 0.16C-1.5Mn-0.4Si (wt%) low-silicon transformation induced plasticity (TRIP) multiphase steel. Three typical dilatometric data are obtained by heating the material to 750°C, 800°C or 900°C, which leads to three different microstructures consisting of (1) ferrite, cementite and austenite, (2) ferrite and austenite and (3) full austenite, respectively. The calculated results using the proposed new method are compared with the results from thermodynamic analysis and those from quantitative microscopic analysis. Significant inter-test discrepancies are observed.
Disciplines :
Materials science & engineering
Author, co-author :
Zhao, Lie; Netherlands Institute for Metals Research
Kop, T. A.; Delft University of Technology > Laboratory for Materials Science
Rolin, Valéry; Université Catholique de Louvain - UCL > Département des sciences des matériaux et des procédés
Siestma, Jilt; Delft University of Technology > Laboratory for Materials Science
Mertens, Anne ; Delft University of Technology > Laboratory for Materials science
Jacques, Pascal J.; Université Catholique de Louvain - UCL > Département des sciences des matériaux et des procédés
van der Zwaag, Sybrand; Delft University of Technology > Laboratory for Materials Science
Language :
English
Title :
Quantitative dilatometric analysis of intercritical annealing in a low-silicon TRIP steel
Publication date :
2002
Journal title :
Journal of Materials Science
ISSN :
0022-2461
eISSN :
1573-4803
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
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