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在Johnson-Mehl-Avrami动力学方程的基础上,建立Fe-C-V-N合金体系中V(C,N)的析出动力学方程,研究了4种氮含量的低碳钒微合金钢(Fe-C0.05-V0.08)中V(C,N)的形核机制及在奥氏体中的析出过程。结果表明:V(C,N)主要形核位置在位错线上,平衡析出的鼻点温度在820℃左右,析出开始时间随氮含量的增大而减小。利用Gleeble-1 500D热力模拟试验机进行了应力松弛试验,根据曲线拟合得到的鼻点温度为850℃,将理论计算与试验值的差异缩小到30℃以内。
Based on the Johnson-Mehl-Avrami kinetic equation, the precipitation kinetics of V (C, N) in Fe-CVN alloy system was established and four kinds of low carbon vanadium microalloyed steel (Fe-C0. 05-V0.08) V (C, N) nucleation mechanism and the precipitation process in austenite. The results show that the main nucleation site of V (C, N) is on the dislocation line, and the temperature of equilibrium precipitation is about 820 ℃. The onset time of precipitation decreases with the increase of nitrogen content. The stress relaxation test was carried out on a Gleeble-1 500D thermodynamic simulator. The temperature of the nasal point obtained from the curve fitting was 850 ° C, and the difference between the theoretical calculation and the experimental value was reduced to less than 30 ° C.