中碳钒-钛-氮微合金钢中碳氮化物析出理论计算
Theoretical Calculation of Carbonitrides in Medium-carbon V-Ti-N Microalloyed Steel
摘 要
对35Mn2V钢中TiN和V(CxN1-x)在奥氏体中的平衡固溶量及V(CxN1-x)中的系数进行了理论计算,并研究了碳、氮、钒含量变化对奥氏体中化学成分的影响.基于钢中各析出相之间的相互溶解现象,分析了实际生产用钢中碳氮化物的类型及析出次序.结果表明:该钢中的V(CxN1-x)最高析出温度为955 ℃左右,在900~750 ℃范围内,V(CxN1-x)析出量显著增加,并且在900 ℃以下V(CxN1-x)中的x≥0.5;钢中碳、氮、钒含量的波动对钒的析出有较明显的影响.
析出
微合金钢
热力学
carbonitride
precipitation
microalloyed steel
thermodynamics
Abstract
The equilibrium solubility of TiN and V(CxN1-x),and the compositional coefficient of V(CxN1-x) in austenite of steel 35Mn2V for oil well tubes were calculated.The effects of C,V and N contents fluctuating on austenite composition were also investigated.The kinds and precipitation sequence of the different carbonitrides in the manufacture process of N80 grade hot-rolling 35Mn2V seamless tubes were analyzed based on the hypothesis,of which TiN and V(CxN1-x) show mutual solubility due to the similarity of their crystal structure.The results have shown that the initial precipitated temperature of V(CxN1-x) is about 955 ℃.The amount of V(CxN1-x) increases noticeably in range of 900-750 ℃.The x in V(CxN1-x) is more than 0.5 when the temperature lower than 900 ℃.The fluctuating of carbon,nitrogen and vanadium has visible effect on the precipitation of vanadium.
中图分类号 TG113.2
所属栏目
基金项目 国家自然科学基金资助项目(50271009)
收稿日期 2005/12/31
修改稿日期 2006/10/10
网络出版日期
作者单位点击查看
备注刘胜新(1968-),女,河北藁城人,副教授,博士.
引用该论文: LIU Sheng-xin,CHEN Yong,LIU Guo-quan,GUAN Shao-kang,LI Qing-kui,NIU Ji-tai. Theoretical Calculation of Carbonitrides in Medium-carbon V-Ti-N Microalloyed Steel[J]. Materials for mechancial engineering, 2007, 31(1): 78～81
刘胜新,陈永,刘国权,关绍康,李庆奎,牛济泰. 中碳钒-钛-氮微合金钢中碳氮化物析出理论计算[J]. 机械工程材料, 2007, 31(1): 78～81
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参考文献
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