Paper Title:
Austenite-Ferrite Transformation in Non-Oriented Electrical Steels
  Abstract

The aim of the present work is to determine the austenite to ferrite transformation temperatures in a Si-Al non-oriented electrical steel. Critical transformation temperatures on heating and cooling are determined using an in-situ X-ray diffraction technique where the specimen is heated or cooled in a stepwise manner. The transformation temperatures are estimated from changes in the intensities of the (110)α and (111)γ peaks as a function of temperature. The time evolution of the microstructure resulting from isothermal heat treatments at temperatures between 800 and 1000 °C applied after cooling from 1050 °C is followed by quantitative metallography on samples quenched into water. The results show that, on cooling, formation of ferrite starts at about 950 °C and ends at 790 °C, indicating a strong effect of Si and Al on the austenite to ferrite and eutectoid transformations. These results suggest that the low tensile ductility exhibited by this material at temperatures near 1000 °C can be attributed to strain localization in strain-induced ferrite formed at temperatures as high as 1025 °C.

  Info
Periodical
Edited by
H. Balmori-Ramirez, J.G. Cabañas-Moreno, H.A. Calderon-Benavides, K. Ishizaki and A. Salinas-Rodriguez
Pages
85-89
DOI
10.4028/www.scientific.net/MSF.560.85
Citation
E. Díaz Barriga-Castro, A. Salinas-Rodríguez, E. Nava-Vázquez, "Austenite-Ferrite Transformation in Non-Oriented Electrical Steels", Materials Science Forum, Vol. 560, pp. 85-89, 2007
Online since
November 2007
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$32.00
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