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Dynamic and Static Recrystalization Behaviour of Coarse-grained Austenite in a Nb-V-Ti Microaloyed Steel

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Abstract

The dynamic recrystalization (DRX) and static recrystalization (SRX) behaviour of coarse-grained austenite in a Nb-V-Ti microaloyed steel were studied by using aGleeble thermomechanical simulator. Continuous and interrupted compression tests of coarseGgrained austenite were performed in the temperature range of 1000–1150 °C at a strain rate of 0.1–5 s−1. The peak and critical strains for the onset of DRX were identified with strain hardening rate analysis, and the ratio of critical strain to peak strain was found to be consistent with the one reported for finegrained austenite. An equation of the time for 50% softening was proposed by considering the activation energy of steel without microaloying elements and the solute drag effect of microaloying elements. Strain-induced precipitation may not take place at the deformation temperature above 1000 °C, which indicates that SRX of coarse-grained austenite is mainly retarded by coarse grain size and Nb in solution during rough rolling.

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Authors and Affiliations

  1. Technology Center, Angang Steel Company Limited, Anshan, Liaoning, 114009, China

    Qing-yun Sha (Doctor, Professor), Da-hang Li & Gui-yan Li

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  1. Qing-yun Sha
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  2. Da-hang Li
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  3. Gui-yan Li
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Correspondence to Qing-yun Sha.

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Sha, Qy., Li, Dh. & Li, Gy. Dynamic and Static Recrystalization Behaviour of Coarse-grained Austenite in a Nb-V-Ti Microaloyed Steel. J. Iron Steel Res. Int. 21, 233–239 (2014). https://doi.org/10.1016/S1006-706X(14)60036-4

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60036-4

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