Austenite Formation in Plain Low-Carbon Steels |
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Authors: | Hamid Azizi-Alizamini Matthias Militzer Warren J Poole |
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Affiliation: | (1) Centre for Metallurgical Process Engineering, The University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada |
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Abstract: | In this study, austenite formation from hot-rolled (HR) and cold-rolled (CR) ferrite-pearlite structures in a plain low-carbon
steel was investigated using dilation data and microstructural analysis. Different stages of microstructural evolution during
heating of the HR and CR samples were investigated. These stages include austenite formation from pearlite colonies, ferrite-to-austenite
transformation, and final carbide dissolution. In the CR samples, recrystallization of deformed ferrite and spheroidization
of pearlite lamellae before transformation were evident at low heating rates. An increase in heating rate resulted in a delay
in spheroidization of cementite lamellae and in recrystallization of ferrite grains in the CR steel. Furthermore, a morphological
transition is observed during austenitization in both HR and CR samples with increasing heating rate. In HR samples, a change
from blocky austenite grains to a fine network of these grains along ferrite grain boundaries occurs. In the CR samples, austenite
formation changes from a random spatial distribution to a banded morphology. |
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