Thermodynamic Calculation of Microalloyed Precipitation in Austenite Region for Fe-C-N-Al-Ti-V Steel
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摘要: 建立了Fe-C-N-Al-Ti-V系在奥氏体中析出的热力学模型，计算结果显示：尽管VN （VC）的浓度积较大，但是通过增加钒的含量和氮的含量，也可以促进V在奥氏体中的析出，在氮含量较高的情况下，碳对V的析出影响较小；即使增加V、C和N的含量，V （CN）也主要是在较低的奥氏体温度析出，在较高温度析出较少；正因为V （CN）的浓度积较大，与Nb （NC）不同，在轧制之前采用较低的加热温度就可以使大部分的钒都固溶到奥氏体中，这样可以获得较小的初始奥氏体晶粒。Abstract: A thermodynamic model of the microalloyed elements precipitation in austenite region for Fe-C-N-Al-Ti-V steel has been established.The computing results show that vanadium can precipitate from the austenite as long as the amount of nitrogen and vanadium can be increased although the solubility of V (CN) is high.When the nitrogen content in the steel is higher, effect of carbon on vanadium precipitation is slight.Even though increasing the amount of vanadium, nitrogen and carbon, V (CN) precipitates at the lower temperature of austenitic mainly too.Because of the great solubility of V (CN) in the austenite which is different from the Nb (CN), the lower reheating temperature can be adopted before rolling and so the smaller initial grains can be gained.
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Key words:
- microalloyed steel /
- austenite /
- thermodynamic model /
- V (CN) /
- precipitation
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