Abstract
Effect of primary austenite grain size and processing parameters on the critical strain of dynamic recrystallization (DRX) during finishing has been investigated and modeled in the present paper. The stress-strain curves were achieved based on the hot compression experiments in the condition of different temperatures and strain rates with different primary austenite grain size. The deformation temperature and strain rate were normalized as Zener–Hollomon (Z) parameter. The experimental results illustrated that the critical strain for DRX was significantly influenced by the primary austenite grain size but peak strain was not, which has been interpreted based on the nucleation and growth of DRX grains. The modeling parameters have been established based on Sellars’ model, with which the effect of grain size and processing parameters on the critical strain for austenite DRX could be quantitatively calculated, which is helpful to design rolling schedule for promote DRX in order to refine grain size. A seven-passes rolling schedule was designed in the case of only 1.5 reduction ratio. The experimental results confirmed that the grain size was significantly refined by promoting austenite DRX, which are good agreement with modeling calculation.
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Xing, J., Zhu, G.H., Ding, H.L. et al. Effect of Grain Size and Processing Parameters on Critical Strain for Austenite Dynamic Recrystallization. Phys. Metals Metallogr. 123, 1299–1305 (2022). https://doi.org/10.1134/S0031918X21100598
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DOI: https://doi.org/10.1134/S0031918X21100598