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Determination of equilibrium transformation temperatures Ae3 and Ae1 for low-carbon steels using the in situ high-temperature X-ray diffraction technique

Published online by Cambridge University Press:  29 February 2012

F. Equihua  and
A. Salinas
F. Equihua*
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Molinos del Rey, P.O. Box 663, Saltillo, Coahuila 25900, Mexico
A. Salinas
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Molinos del Rey, P.O. Box 663, Saltillo, Coahuila 25900, Mexico
*
a)Author to whom correspondence should be address. Electronic mail: [email protected]
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Abstract

This paper describes a method to determine the equilibrium transformation temperatures in low C steels using the in situ high-temperature X-ray diffraction technique. The samples were heated and then cooled from 1000 to 720 °C in a stepwise manner decreasing to −10 °C. Austenite and ferrite fractions were determined by a quantitative method using the integrated intensities of austenite (111)γ and ferrite (110)α peaks from X-ray diffraction patterns. The effect of the temperature on interplanar d spacings of (111) and (110) crystallographic planes was determined using 2θ maximum positions of the austenite (111)γ and ferrite (110)α peaks. The equilibrium transformation temperatures were determined to be Ae1=720 °C and Ae3=950 °C. The results are in excellent agreement with those obtained by dilatometric analysis and Thermo-Calc phase diagram simulation software. In addition, the results were supported by microstructural observations: the formation of thin ferrite films (5–10 μm) was observed at temperatures near to experimental Ae3.

Keywords

in situ X-ray diffractionequilibrium transformationHTXRDausteniteferrite
Type
Technical Articles
Information
Powder Diffraction , Volume 25 , Issue 1 , March 2010 , pp. 31 - 37
Copyright
Copyright © Cambridge University Press 2010

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