Effect of Prior Austenite Grain Size on Pearlite Transformation in a Hypoeuctectoid Fe-C-Mn Steel

The aim of this work is to evaluate the influence of the prior austenite grain size (AGS) on the austenite-to-pearlite isothermal decomposition in a Fe-C-Mn hypoeutectoid steel. Due to the strong influence, grain boundaries have on pearlite transformation kinetics, morphological aspects of pearlite...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2014-04, Vol.45 (4), p.1778-1786
Main Authors: Aranda, M. M., Kim, B., Rementeria, R., Capdevila, C., de Andrés, C. García
Format: Article
Language:English
Subjects:
Austenite
Austenitic transformations
Cementite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Decomposition
Ferrite
Ferrites
Grain boundaries
Grain size
Kinetics and Microstructure Control
Materials Science
Metallic Materials
Nanotechnology
Pearlite
Steel
Steels
Structural Materials
Surfaces and Interfaces
Symposium: International Workshop on Materials Design Process: Thermodynamics
Thin Films
Transformations
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Summary:The aim of this work is to evaluate the influence of the prior austenite grain size (AGS) on the austenite-to-pearlite isothermal decomposition in a Fe-C-Mn hypoeutectoid steel. Due to the strong influence, grain boundaries have on pearlite transformation kinetics, morphological aspects of pearlite from two conditions with very different AGS were studied and characterized. Results allow us to conclude that the formation of pearlite and ferrite are favored for small AGS values, whereas a larger AGS led to an increase in the total amount of pearlite volume fraction. Furthermore, the average size of pearlitic colonies increased with increasing AGS, and it appears that the interlamellar spacing of the pearlite does not depend on AGS, but instead, is controlled by the isothermal decomposition temperature. Finally, it was observed that the ratio between lamellar thickness of ferrite and cementite depended on AGS.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-013-1996-0