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Abstract：
High-carbon hardline steels are primarily used for the manufacture of tire beads for both automobiles and aircraft, and vanadium (V) microalloying is an important means of adjusting the microstructure of high-carbon hardline steels. Using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM), the microstructure and precipitation phases of continuous cooled high-carbon steels were characterized, and the vanadium content, carbon diffusion coefficient, and critical precipitation temperature were calculated. The results showed that as the V content increased to 0.06 wt.%, the interlamellar spacing (ILS) of the pearlite in the experimental steel decreased to 0.110 μm, and the carbon diffusion coefficient in the experimental steel decreased to 0.98 × 10-3 cm2·s-1. The pearlite content in the experimental steel with 0.02 wt.% V reached its maximum at a cooling rate of 5 °C·s-1, and a small amount of bainite was observed in the experimental steel at a cooling rate of 10 °C·s-1. The precipitated phase was VC with a diameter of ~24.73 nm, and the misfit between ferrite and VC was 5.02%, forming a semi-coherent interface between the two. Atoms gradually adjust their positions to allow the growth of VC along the ferrite direction. As the V content increased to 0.06 wt.%, the precipitation-temperature-time curve (PTT) shifted to the left, and the critical nucleation temperature for homogeneous nucleation, grain boundary nucleation, and dislocation line nucleation increased from 570.6, 676.9, and 692.4 °C to 634.6, 748.5, and 755.5 °C, respectively.
摘要：
高碳硬线钢主要用于制造汽车和飞机的轮胎胎圈，钒(V)微合金化是调节高碳硬钢显微组织的重要手段。使用扫描电子显微镜（SEM），X射线衍射(XRD)和透射电子显微镜（TEM），对连续冷却高碳钢的显微组织和析出相进行了表征，和钒含量，碳扩散系数，并计算了临界降水温度。结果表明，随着V含量增加到0.06wt。%,实验钢中珠光体的层间间距(ILS)降至0.110μm,实验钢中的碳扩散系数降至0.98×10-3cm2·s-1。实验钢中的珠光体含量为0.02wt。％V在5°C·s-1的冷却速率下达到最大值，并且在10°C·s-1的冷却速率下在实验钢中观察到少量贝氏体。析出相为VC，直径为〜24.73nm，铁素体与VC的失配率为5.02%，在两者之间形成半相干的界面。原子逐渐调整其位置，以允许VC沿铁素体方向生长。随着V含量增加到0.06wt。%,降水-温度-时间曲线（PTT）向左移动，和均相成核的临界成核温度，晶界成核，位错线成核从570.6、676.9和692.4°C增加到634.6、748.5和755.5°C，分别。
