含钒微合金钢的析出行为研究
方芳 雍岐龙 杨才福 张永权 苏 航
武钢研究院
The precipitation behavior in vanadium micro-alloyed steel
FANG Fang
摘要 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N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N含量的增大而减小。利用Gleeble-1500D热力模拟实验机进行了应力松弛实验，根据曲线拟合得到的鼻点温度为850 ℃，将理论计算与实验值的差异缩小到30 ℃以内。
关键词 ：
低碳钒微合金钢 ,
析出动力学 ,
形核机制 ,
N
Abstract ：A kinetics model based on Johnson-Mehl-Avrami equation has been developed to predict the nucleation mechanisms and kinetics of V(C,N) precipitate in austenite in low carbon vanadium micro-alloyed steel (0.05%C-0.08%V) with four nitrogen contents. The results calculated by the model indicate that, the precipitates nucleated preferentially at dislocation; the nose temperature of V(C,N) precipitate in austenite is around 820℃; and the start times to precipitate decrease with increasing nitrogen. The experimental results obtained from stress-relaxation on Gleeble-1500D showed that, the nose temperature is 850 ℃, which shorted the error within 30 ℃.
Key words ：
low carbon vanadium micro-alloyed steel
precipitation kinetics
nucleation mechanism
N
收稿日期: 2009-02-09
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2010, Vol. 45 
