Abstract
X80 steel, as typical low-carbon Nb-V-Ti microalloyed steel, is getting more and more attention in oil and gas transmission pipeline manufacturing. In this paper, the hot deformation behavior of X80 steel has been investigated. Hot compression tests of the steel were conducted under different temperatures and strain rates. Based on the experimental data, the flow stress constitutive equations were established. It is found that the hot deformation activation energy of this steel is higher than C-Mn and low-carbon steel. Then, the kinetics model and grain size model of dynamic recrystallization were developed according to the flow curves and the optical microstructures. In addition, the processing maps were developed to analyze the workability of X80 steel at elevated temperature. The analysis results show that the optimum processing window is at the temperature of 1300-1473 K and the strain rate of 0.01-10 s−1. The microstructure observation indicates that the optimum processing parameters are applicable to the tested steel.
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This work was supported by the National Natural Science Foundation of China (No. 51604058).
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Shen, W., Zhang, C., Zhang, L. et al. Experimental Study on the Hot Deformation Characterization of Low-Carbon Nb-V-Ti Microalloyed Steel. J. of Materi Eng and Perform 27, 4616–4624 (2018). https://doi.org/10.1007/s11665-018-3594-1
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DOI: https://doi.org/10.1007/s11665-018-3594-1