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Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The hot deformation behavior of S460ML steel with different Nb contents was investigated by single-pass compression experiment on the Gleeble-1500 thermo-machine simulator at deformation temperatures ranging from 900 to 1200 °C and strain rates from 0.1 to 5.0 s−1. The critical strain of dynamic recrystallization (DRC) under different conditions was determined by using working hardening rate-strain curves. The relationship between critical strain and peak strain of DRC was discussed. By means of regression analysis method, the hot deformation activation energy of steels and the mathematical model for predicting DRC critical strain were calculated and established, respectively. The results showed that DRC occurred during hot deformation. As the deformation temperature increased and strain rate decreased, the critical strain of DRC decreased. The critical strain (εc) showed linear relationship with peak strain (εp). As Nb content increased, the needed deformation temperature for occurring DRC increased, while the needed strain rate for it decreased. The activation energy for hot deformation of S460ML steel increased with increasing Nb content.

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Correspondence to Yu-Cheng Zhang.

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Zhang, YC., Meng, ZS., Meng, Y. et al. Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel. Acta Metall. Sin. (Engl. Lett.) 32, 526–534 (2019). https://doi.org/10.1007/s40195-018-0783-8

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  • DOI: https://doi.org/10.1007/s40195-018-0783-8

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