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| INFLUENCE OF Mn CONTENT ON DYNAMIC RECRYSTALLIZATION OF FERRITE IN LOW CARBON STEELS |
| LI Longfei; YANG Wangyue;SUN Zuqing |
| School of Materials Science & Engineering; University of Science & Technology Beijing; Beijing 100083 |
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Cite this article:
LI Longfei; YANG Wangyue; SUN Zuqing. INFLUENCE OF Mn CONTENT ON DYNAMIC RECRYSTALLIZATION OF FERRITE IN LOW CARBON STEELS. Acta Metall Sin, 2004, 40(12): 1257-1263 .
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Abstract The hot deformation behaviors and the microstructure evolution of three
low carbon steels with similar C compositions and different Mn mass
fractions (0.48%, 0.84% and 1.29%, respectively) are investigated by
uniaxial hot compression at deformation temperatures of 700 ℃ and 600 ℃
and strain rates of 10 1 s -1 to 10 -3 s -1. The effect of Mn
on dynamic recrystallization of ferrite is analyzed. The results indicate
that dynamic recrystallization of ferrite occurs in these low carbon
steels under certain deformation conditions, which range is wider as the
content of Mn is lower. The effect of Mn on dynamic recrystallization of
ferrite is that the increase of Mn content leads to the increases of pearlite
amount and the deformation activity energy when deformed in the ferrite
region, the former is beneficial to the dynamic recrystallization
and the latter is just opposite. Because the latter is
dominant, the increase of Mn content in low carbon steel is unfavorable
for the progress of dynamic recrystallization of ferrite. At the deformation
condition that the progress of dynamic recrystallization of ferrite can occur
completely, the increase of Mn content results in a microstructure with
finer ferrite grains.
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Received: 10 October 2003
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