Recrystallization kinetics of microalloyed steels deformed in the intercritical region |
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Authors: | E A Simielli S Yue J J Jonas |
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Affiliation: | 1. Department of Metallurgy, Institute de Pesquisa Tecnol?gica do Estado de S?o Paulo (IPT), Cidade Universitária, SP 05508, S?o Paulo, Brazil 2. Department of Metallurgical Engineering, McGill University, H3A 2A7, Montreal, PQ, Canada
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Abstract: | A plain carbon and two microalloyed steels were tested under interrupted loading conditions. The base steel contained 0.06
pct C and 1.31 pct Mn, and the other alloys contained single additions of 0.29 pct Mo and 0.04 pct Nb. Double-hit compression
tests were performed on cylindrical specimens of the three steels at 820 °C, 780 °C, and 740 °C within the α + γ field. A’softening
curve was determined at each temperature by the offset method. In parallel, the progress of ferrite recrystallization was
followed on quenched specimens of the three steels by means of quantitative metallography. It was observed that, in the base
steel, a recrystallizes more slowly thany. The addition of Mo retards recrystallization and has a greater influence on γ than on α recrystallization. This effect is
in agreement with calculations based on the Cahn theory of solute drag. Niobium addition has an even greater effect on the
recrystallization of the two phases. In this steel, the recrystallization of ferrite was incomplete at the three intercritical
temperatures. Furthermore, the austenite remained completely unrecrystallized up to the maximum time involved in the experiments
(1 hour). The metallographic results indicate that the nucleation of recrystallization occurs heterogeneously in the microstructure,
the interface between ferrite and austenite being the preferred site for nucleation. |
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