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中文摘要：
用包括奥氏体γ相和两个碳氮化物相三相溶解度间隙平衡处理的方法计算了V—Ti—N微合金非调质油井管钢中的碳氮化物析出,计算结果表明，此钢奥氏体中的析出模式为1473℃时TiN即开始析出；其后部分TiN逐渐转变为复合（TixV1-x）（CyN1-y）颗粒，而其他的TiN直到低温仍保持其化学性质；最后富V—C的V（CxN1-x）在846℃开始析出．实验数据验证了这种析出模式．计算结果支持了中碳含钒微合金钢中800℃以下奥氏体中的析出对其后的奥氏体分解相变具有明显的调控作用的观点．
英文摘要：
The precipitation behaviors of carbonitrides in a V-Ti-N microalloyed steel for nonquenched/tempered seamless oil-well tubes were calculated by the equilibrium principle of a three-phase miscibility gap including the austenite and two carbonitrides. The thermodynamic calculations indicate that the precipitates formed first at 1 473 ℃ are TiN particles, subsequently some of them formed at high temperatures maintain the chemical properties down to low temperatures, the others gradually transform to complex （TixV1-x） （CyNl-y） carbonitrides. In addition, the precipitates formed at 846 ℃ are V-and C-rich V（CxN1-x） carbonitrides. The formation sequence is verified by experimental data. These results are more consistent with the viewpoint that, the precipitation behavior of vanadium in the austenite matrix below 800 ℃ in medium-carbon V-bearing microalloyed steels plays a great role in controlling the decomposition of austenite.
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