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| Microstructure Evolution During Eformation--Enhanced Transformation in |
| CHEN Guoan; YANG Wangyue; GUO Shouzhen; SUN Zuqing |
| School of Material Science & Engineering; University of Science & Technology Beijing; Beijing 100083 |
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Cite this article:
CHEN Guoan; YANG Wangyue; GUO Shouzhen; SUN Zuqing. Microstructure Evolution During Eformation--Enhanced Transformation in. Acta Metall Sin, 2004, 40(10): 1079-1084 .
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Abstract The microstructure evolution during deformation enhanced transformation
of supercooled austenite in Nb-microalloyed steel has been investigated
by means of hot compression simulation experiment. The effect of Nb on
the strain enhanced ferrite transformation has been studied and the
transformation kinetics and orientation of Nb--microalloyed steel has
also been analysed. The experimental results showed that the deformation-enhanced
transformation is a dominated factor at the deformation temperature
between A3 and Ar3. The transformation incubation period
of Nb-microalloyed steel was prolonged and therefore the higher strain
was needed to accomplish the transformation. The transformation
kinetics curves moved to high strain parallelly, and can be divided into
two stages: at the first stage the solute Nb dragged the ferrite
transformation and led to a long incubation period; at
the second stage the fine Nb(C, N) particles not only produced many favorable
nucleation sites for ferrite transformation, but also inhibited the grain
growth of ferrite. The microstructure evolution is a nucleation dominated
process, in which the interchange between 001 and 111 texture appeared.
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Received: 14 November 2003
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