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<p>In this study, novel medium-C high-V twinning induced plasticity (TWIP) steels for cryogenic applications were designed. Effects of V content on the microstructure and mechanical properties of the experimental steels were investigated. The results indicated that with the increase in V content, the microstructures of the experimental steels changed from completely recrystallized one to incompletely recrystallized one, the average grain size and the average diameter of secondary phase particles reduced, and the volume fraction of secondary phase particles improved. The combined action of dislocation strengthening, fine-grain strengthening, precipitation strengthening and solid-solution strengthening led to the significant increase in the YS (yield strength) of the hot-rolled plate of 06&#xa0;V steel, and the increment of which could be 132&#xa0;MPa. The decrease in grain size, the increase in the volume fraction of second-phase particles and the presence of unrecrystallized microstructure led to the decrease in the level of deformation twinning activity in the hot-rolled plate of 06&#xa0;V steel, which was the main reason for the deterioration in the impact toughness of this hot-rolled plate. The achievement of the coexistence of recrystallized and unrecrystallized microstructures in the experimental steel by hot rolling was an effective means to modulate the tensile properties.</p>

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Effects of V content on the microstructure and mechanical properties of novel medium-C high-V TWIP steels for cryogenic applications

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Yong Chen,
  • Xiao-Ming Zhang,
  • Yuan-Yuan Chen,
  • Hua Ding,
  • Zhi-Hui Cai,
  • Guang-Ming Liu,
  • Hua-Ying Li

摘要

In this study, novel medium-C high-V twinning induced plasticity (TWIP) steels for cryogenic applications were designed. Effects of V content on the microstructure and mechanical properties of the experimental steels were investigated. The results indicated that with the increase in V content, the microstructures of the experimental steels changed from completely recrystallized one to incompletely recrystallized one, the average grain size and the average diameter of secondary phase particles reduced, and the volume fraction of secondary phase particles improved. The combined action of dislocation strengthening, fine-grain strengthening, precipitation strengthening and solid-solution strengthening led to the significant increase in the YS (yield strength) of the hot-rolled plate of 06 V steel, and the increment of which could be 132 MPa. The decrease in grain size, the increase in the volume fraction of second-phase particles and the presence of unrecrystallized microstructure led to the decrease in the level of deformation twinning activity in the hot-rolled plate of 06 V steel, which was the main reason for the deterioration in the impact toughness of this hot-rolled plate. The achievement of the coexistence of recrystallized and unrecrystallized microstructures in the experimental steel by hot rolling was an effective means to modulate the tensile properties.