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论文类型：期刊论文

发表时间：2018-09-01

发表刊物：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

收录刊物：SCIE

卷号：27

期号：9

页面范围：4616-4624

ISSN号：1059-9495

关键字：critical strain; dynamic recrystallization; kinetics model; microalloyed steel; processing map

摘要：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 1300-1473K and the strain rate of 0.01-10s(-1). The microstructure observation indicates that the optimum processing parameters are applicable to the tested steel.