Metall. Res. Technol.
Volume 111, Number 4, 2014
|Page(s)||221 - 227|
|Published online||04 July 2014|
Beneficial effect of B on hot ductility of 20CrMnTi steel with 0.05% Sn
1 State Key Laboratory of Advanced
Metallurgy, University of Science and Technology Beijing, Beijing
2 Xining Special Steel Co. Ltd., Xining 810005, P.R. China
Accepted: 4 June 2014
The beneficial effect of B on the hot ductility of 20CrMnTi steel with 0.05% Sn was investigated. The results show that there is a trough in the hot ductility-temperature curve. With the increase in the B content, the trough shifts to a lower temperature and becomes shallow, and the hot brittle range becomes narrow. In addition, B greatly enhancing the hot ductility was due mainly to its suppressing the Sn segregation, retarding the austenite/ferrite deformation, accelerating the onset of dynamic recrystallization (DRX) and promoting the intragranular nucleation of ferrite. Moreover, in the present case, adding 92 ppm B can nucleation of ferrite. Moreover, in the present case, adding 92 ppm B can obtain the best effect in improving the hot ductility of 20CrMnTi steel with 0.05% Sn.
Key words: Boron / tin / hot ductility / 20CrMnTi steel
© EDP Sciences 2014
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