中碳VTiN非调质无缝钢管用钢中碳氮化物析出理论计算.pdfVIP

中碳V-Ti-N 非调质无缝钢管用钢中碳氮化物析出理论计算* 1,2 1 2 1 1 1 刘胜新 , 陈 永 , 刘国权 , 关绍康 , 李庆奎 , 牛济泰 (1 郑州大学材料科学与工程学院, 河南郑州 450002; 2 北京科技大学材料科学与工程学院, 北京 100083) 摘 要：对35Mn2V 钢中TiN 和V(C N )在奥氏体中的平衡固溶量及V(C N ) 中的系数进行了理论计算，并研 x 1-x x 1-x 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V(CxN 1-x)最高析出温度为 955°C 左右，在 600-750°C 范围内时， V(C N )析出量显著增加，并且在900°C 以下的温度范围内V(C N ) 中的x≥0.5 。钢中碳、氮、钒的波动对钒的析出 x 1-x x 1-x 有较明显的影响。 关键词：碳氮化物；析出；微合金钢；热力学 中图分类号：TG113.2 文献标识码：A 文章编号： Theoretical Calculation of Carbonitrides in Medium-carbon V-Ti-N Microalloyed Steel for Non-Quenched/Tempered Oil-well Tubes 1 1 2 1 1 1 LIU Sheng-xin , CHEN Yong , LIU Guo-quan , Guan Shao-kang , LI Qing-Kui , NIU Ji-tai (1. Zhengzhou University, Zhengzhou 450002, China; 2. University of Science and Technology Beijing, Beijing 100083, China) Abstract ：The equilibrium solubility of both TiN and V(C N ), and the compositional coefficient of V(C N ) in austenite x 1-x x 1-x 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 non-quenched/tempered manufacture process of N80 grade hot-rolling 35Mn2V seamless tubes were analyzed based on the hypothesis, of which