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对铌钒微合金化高碳钢的奥氏体晶粒尺寸、连续冷却转变动态曲线(CCT图)以及等温转变曲线(TTT图)进行了测定,研究加热温度、冷却速度和保温温度对组织性能的影响。结果表明:实际生产中,应将加热温度控制在1100℃以下,避免奥氏体晶粒的粗化;相变前冷速控制在8 K/s以上,相变温度为620~650℃,相变温度区间内冷速控制在1.0~2.5 K/s,可获得均匀的索氏体组织和较好的性能。
The austenite grain size, continuous cooling transformation dynamic curve (CCT) and isothermal transformation curve (TTT) of niobium-vanadium microalloyed high carbon steel were studied. The effect of heating temperature, cooling rate and holding temperature on microstructure and properties Impact. The results show that in actual production, the heating temperature should be controlled below 1100 ℃ to avoid austenite grain coarsening; the cooling rate is controlled above 8 K / s before transformation, the transformation temperature is from 620 ℃ to 650 ℃, Controlling the cooling speed in the range of 1.0 ~ 2.5 K / s in the variable temperature range, uniform sorbite structure and better performance can be obtained.