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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 the double sub-lattice model of regular solution, the composite carbonitride (V_x, Ti_ (1-x)) (C_yN_ (1-y)) in V-Ti composite microalloyed N80 non- The thermodynamic model was developed to calculate the volume fraction of austenite and the precipitated phase in N80 steel at different temperatures (750-1500 ℃). The results show that the precipitation temperature of composite carbonitride (V_x, Ti_ (1-x)) (C_yN_ (1-y)) is 1470 ℃ and the maximum precipitation amount is 2.0 × 10 ~ (-4). The precipitation order of microalloying elements is TiN → (TiV) (CN) → VC. The precipitates are mainly Ti-rich and V-rich nitrides in the high temperature stage, while the precipitates are mainly V- the Lord.