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In-Situ Observations on Interphase Boundary Migration and Grain Growth during α/γ Phase Transformation in Iron Alloys

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Abstract:

In-situ observations of a/g phase transformation were made to study the effect of grain boundary microstructure of the generation of a new phase and the migration of a/g interphase boundaries in an Iron-4.2at.%Cr alloy. It was found that triple junctions with more random boundaries could be the primary nucleation sites, while triple junctions with low angle and low S coincidence boundaries did not play a role as preferential sites. The migration of a/g interphase boundaries during heating across the transformation temperature showed the two stage behaviour characterized first by a stage with a migration velocity of 0.33-0.75µm/s and secondly a stage with 3.7-7.6 µm/s. It was also found that abnormal grain growth and a high density of S3 coincidence boundaries could occur in the a/bcc phase after cycling of a/g/ a phase transformation.

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Periodical:

Materials Science Forum (Volumes 467-470)

Pages:

819-824

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.467-470.819

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Online since:

October 2004

Authors:

Tadao Watanabe, Kouichi Obara, Sadahiro Tsurekawa

Keywords:

Grain Boundary Microstructure, Grain Growth, Interphase Boundary Migration, α/γ Phase Transformation

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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