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Induced ferrite formation above the Ae3 during plate rolling simulation of a X70 steel

Published online by Cambridge University Press:  02 September 2019

Samuel F. Rodrigues ,
Thiago B. Carneiro ,
Clodualdo Aranas Jr. ,
Eden S. Silva ,
Fulvio Siciliano ,
Gedeon S. Reis  and
John J. Jonas
Samuel F. Rodrigues*
Affiliation:
Department of Materials Engineering, Federal Institute of Education, science and Technology of Maranhao, Sao Luis 65075-441, Brazil.
Thiago B. Carneiro
Affiliation:
Department of Materials Engineering, Federal Institute of Education, science and Technology of Maranhao, Sao Luis 65075-441, Brazil.
Clodualdo Aranas Jr.
Affiliation:
Department of Mechanical Engineering, University of New Brunswick, Fredericton, E3B 5A3, Canada.
Eden S. Silva
Affiliation:
Department of Materials Engineering, Federal Institute of Education, science and Technology of Maranhao, Sao Luis 65075-441, Brazil.
Fulvio Siciliano
Affiliation:
Dynamic Systems Inc. 323 NY 355, Poestenkill, New York 12140, United States of America.
Gedeon S. Reis
Affiliation:
Department of Materials Engineering, Federal Institute of Education, science and Technology of Maranhao, Sao Luis 65075-441, Brazil.
John J. Jonas
Affiliation:
Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada.
*
*Correspondence: samuel.filgueiras@ifma.edu.br
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Abstract

Partial amount of austenite can be dynamically transformed into ferrite above the Ae3 temperature when it is being deformed. This happens by a displacive mechanism. On removal of the load, it retransforms back into the stable austenite by diffusional processes. Plate rolling simulation under continuous cooling conditions was carried out on a high Nb X70 steel. Pass strains of 0.2 together with interpass times of 10, 20 and 30 s were employed. The initial and final temperatures for the finishing simulation were 920 and 830 °C, respectively. The mean flow stresses (MFS`s) behaviour indicates that dynamic transformation (DT) and recrystallization (DRX) were taking place during straining. It is shown that ferrite is formed during the roughing passes and increases its volume fraction throughout the finishing rolling steps. The ferrite formation is favoured by strain accumulation, shorter time between passes and also when the temperature reaches the Ae3 line. The results obtained here can be used to design improved models for transformation on accelerated cooling.

Keywords

phase transformation
Type
Articles
Information
MRS Advances , Volume 4 , Issue 57-58: International Materials Research Congress XXVIII , 2019 , pp. 3077 - 3085
Copyright
Copyright © Materials Research Society 2019 

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