Resumo

ZHOU, C-Y.; WU, G-L.  e  LIU, X-B.. Static recrystallization behaviour of Ti-Nb microalloyed high-strength steel. J. S. Afr. Inst. Min. Metall. [online]. 2017, vol.117, n.5, pp.451-456. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2017/v117n5a7.

The static recrystallization behaviour of Ti-Nb microalloyed high-strength steel during hot deformation was studied by conducting double-hit hot compression experiments using a Gleeble-3500 thermomechanical simulator. The effects of deformation temperature, strain rate, strain, and initial austenite grain size on the static recrystallization fraction are discussed. The static recrystallization kinetics were modelled, and the results show that the static recrystallization fraction increased with deformation temperature, strain rate, and strain and interpass time. The static recrystallization activation energy Qs was 326.05 kJ mol^-1. Comparison of the experimental results and predicted results indicates that the effects of deformation parameters on the static recrystallization in multistage hot deformation are significant. The predicted results are in good agreement with the experimental results.

Palavras-chave : Keywords Ti-Nb microalloyed high-strength steel; static recrystallization; activation energy; kinetic model.

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