含钒微合金钢的析出行为研究  

Precipitation Behavior in Vanadium Micro-Alloyed Steel

作　　者：方芳[1] 雍岐龙[1] 杨才福[1] 张永权[1] 苏航[1] 

机构地区：[1]钢铁研究总院结构材料研究所,北京100081

出　　处：《钢铁》2010年第3期66-69,共4页Iron and Steel

基　　金：国家自然科学基金项目(50441032)

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 Johnson-Mehl-Avrami equation,a kinetic model was 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 4 kinds of 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 time to precipitate decrease with increase of nitrogen.The experimental results obtained from stress-relaxation on Gleeble-1 500D show that,the nose temperature is 850 ℃,which reduces the error within 30 ℃.

关 键 词：低碳钒微合金钢 析出动力学 形核机制 

分 类 号：TG142.15[一般工业技术—材料科学与工程]