Crystallography of Ferrite Nucleation at Austenite Grain Boundary in a Low Carbon Steel

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Orientation relationships of proeutectoid ferrite formed at an austenite grain boundary with respect to adjacent austenite grains were investigated by means of electron backscatter diffraction in an isothermally transformed Fe-1.5Mn-0.2C (mass%) alloy. A grain bounadry ferrite holds nearly the Kurdjumov-Sachs (K-S) orientation relationship with some small misorientation against at least one of the adjacent austenite grains. There is strong variant selection by the austenite grain boundary for ferrite nucleation. At a higher transformation temperature, the fraction of ferrites holding a near K-S relationship with respect to the opposite austenite grain is lower. As the transformation temperature becomes lower, the misorientation from the K-S relationship becomes smaller against the near K-S related austenite grain whereas the misorientation against the irrationally oriented austenite grain becomes larger.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

7-10

DOI:

10.4028/www.scientific.net/MSF.654-656.7

Citation:

T. Furuhara et al., "Crystallography of Ferrite Nucleation at Austenite Grain Boundary in a Low Carbon Steel ", Materials Science Forum, Vols. 654-656, pp. 7-10, 2010

Online since:

June 2010

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$35.00

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