Calculation on the incubation period of proeutectoid ferrite transformation for Si-Mn TRIP steel |
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Authors: | Guang-bo Tang Ning-qi Peng Zheng-dong Liu |
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Institution: | (1) Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi 316-8511, Japan;(2) Quantum Beam Science Directorate, Japan Atomic Energy Agency, 2-4 Shirane Shirakata, Tokai-mura, Naka-gun Ibaraki, 319-1195, Japan;(3) ISIS-STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK |
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Abstract: | The incubation period of proeutectoid ferrite transformation for Si-Mn transformation induced plasticity (TRIP) steel has
been calculated by the Aaronson’s incubation period model for transformation. The influences of chemical compositions and
hot deformation of austenite on the incubation period have been taken into consideration in the calculation, and some parameters
have been proposed and validated with the measured time temperature transformation (TTT) curves from dilation tests. The calculation
results show that it is essential to take into account of the effect of solute atoms on the interfacial energy in the austenite
grain boundaries. For hypoeutectoid steel, the incubation period of ferrite transformation increases with the increase of
C and Mn contents, and C has a greater impact than that of Mn, while the incubation period of ferrite transformation decreases
with the increase of Si content. Hot deformation shortens the incubation time and promotes austenite to ferrite transformation. |
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