V-Ti复合微合金化N80非调质油套管钢碳氮化物析出热力学研究  

Research on Thermodynamics of Carbonitride Precipitation Behavior of V-Ti Composite Micro-alloying N80 Non Q&T Casing Steel

作　　者：李景翠 万继方[2] 江山[2] 郝强升 张施琦 

机构地区：[1]中国石油集团钻井工程技术研究院,北京100197 [2]长江大学机械工程学院,湖北荆州434023 [3]中国石油海外勘探开发公司,北京100011 [4]清华大学材料学院先进材料教育部重点实验室,北京100084

出　　处：《热加工工艺》2016年第22期88-91,共4页Hot Working Technology

摘　　要：基于规则溶液的双亚点阵模型建立了V-Ti复合微合金化N80非调质油套管钢中复合碳氮化物(V_x,Ti_(1-x))(C_yN_(1-y))的析出热力学模型,计算了不同温度(750~1500℃)下N80钢中碳氮化物析出相的体积分数、奥氏体及析出相的化学成分。结果表明,复合碳氮化物(V_x,Ti_(1-x))(C_yN_(1-y))的析出开始温度为1470℃,最大析出量可达到2.0×10^(-4)。微合金元素的析出次序是TiN→(TiV)(CN)→VC,在高温阶段的析出相主要以富Ti微量V的氮化物为主,而在低温阶段析出相主要以富V复合碳化物为主。Based on two sublattice models of regular solutions, a precipitation thermodynamic model of complex carbonitride （VxTi1-x）（CyN1-y） in N80 non Q＆T casing steel was established. Then, the volume fraction of carbonitride precipitates and the composition of austenite and the precipitation phase at different temperatures （750-1500 ℃） in N80 steel were calculated. The results show that the precipitation starting temperature of composite carbonitride （Vx Ti1-x） （CyN1-y） precipitation is 1470℃, an the maximum precipitation quantity is 2.0×104. The dissolve sequence of micro-alloy element is TiN→（TiV）（CN）→VC. Ti-rich trace V complex nitride is considered as the dominant precipitate phase in high temperature region, and V-rich complex carbide is the main precipitate phase in low temperature region.

关 键 词：N80油套管钢 碳氮化物 析出行为 热力学 

分 类 号：TG142.1[一般工业技术—材料科学与工程]