Influence of Deformation and Molybdenum Content on Acicular Ferrite Formation in Medium Carbon Steels

The present work deals with the influence of deformation and molybdenum content on the subsequent austenite-to-acicular ferrite transformation during continuous cooling in medium carbon microalloyed steels. The results obtained demonstrate that higher deformation temperature induces a finer austenit...

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Bibliographic Details
Published in:ISIJ International 2006, Vol.46(7), pp.1093-1100
Main Authors: Capdevila, Carlos, Ferrer, Juan P., García-Mateo, Carlos, Caballero, Francisca G., López, Victor, Andrés, Carlos García de
Format: Article
Language:English
Subjects:
acicular ferrite
Applied sciences
continuous cooling diagrams
Exact sciences and technology
forging steel
Metals. Metallurgy
molybdenum
phase transformation
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Summary:The present work deals with the influence of deformation and molybdenum content on the subsequent austenite-to-acicular ferrite transformation during continuous cooling in medium carbon microalloyed steels. The results obtained demonstrate that higher deformation temperature induces a finer austenite grain size as a result of austenite recrystallisation processes during cooling down to austenite decomposition temperature. The higher the molybdenum content and severity of deformation are, the finer austenite grain is. Likewise, it was concluded that molybdenum suppress pearlitic microstructure, and clearly delay proeutectoid ferrite field to longer times. By contrast, acicular ferrite transformation is enhanced in molybdenum rich steel, which not only affect the volume fraction but also the morphology of acicular ferrite.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.46.1093