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发明公开
CN110826175A 一种四元第二相析出物在铁素体钢中析出的热力学计算方法 审中-公开

一种四元第二相析出物在铁素体钢中析出的热力学计算方法
摘要：
本发明涉及一种四元第二相析出物在铁素体钢中析出的热力学计算方法，本发明对C-N-Nb-V系的热轧TRIP钢在奥氏体区中的热动力学析出行为进行了计算，随后采用线性分解将复合析出的(M′XM″1-X)(CyN1-y)线性分解m1(M′C)，m2(M′N)，m3(M″C)，m4(M″N)，计算出(M′XM″1-X)(CyN1-y)在奥氏体中析出的NrT(最大形核率温度)和PTT(最快析出鼻点温度)曲线，计算结果表明：C(0.2)-N(0.015)-Nb(0.05)-V(0.1)成分的热轧TRIP钢其均匀形核、晶界形核、位错形核的最大形核率温度分别是792℃、862℃、782℃，位错线上形核时(形核率迅速衰减为零)，其鼻点温度为834℃，对热轧纳米粒子铁素体钢中的第二相粒子的热动力学析出计算对于热轧、热处理工艺具有理论指导意义，可用于汽车吸收碰撞能量的部件，在提高安全性的同时，还会避免车身增重。
摘要（英）：

The invention relates to a thermodynamic calculation method for precipitation of quaternary second-phase precipitates in ferrite steel. According to the method, the thermodynamic precipitation behavior of the C-N-Nb-V series hot-rolled TRIP steel in an austenite region is calculated; then, linearly decomposing the (M 'XM' '1-X) (CyN1-y) which is compounded and separated out into m1 (M' C) by adopting linear decomposition; m2 (M 'N), m3 (M ''C), m4 (M ''N), calculating an NrT (maximum nucleation rate temperature) curve and a PTT (fastest precipitation nose point temperature) curve of (M 'XM' '1-X) (CyN1-y) precipitated in austenite; calculation results show that the calculation results are shown in the specification; the maximum nucleation rate temperatures of uniform nucleation, grain boundary nucleation and dislocation nucleation of the hot-rolled TRIP steel containing the components C (0.2)-N (0.015)-Nb (0.05)-V (0.1) are 792 DEG C, 862 DEG C and 782 DEG C respectively; when nucleation is carried out on a dislocation line (the nucleation rate is rapidly attenuated to zero); the nose point temperature is 834 DEG C, the thermodynamic precipitation calculation of second-phase particles in the hot-rolled nanoparticle ferrite steel has theoretical guiding significance for hot rolling and heat treatment processes, the hot-rolled nanoparticle ferrite steel can be used as a part of an automobile for absorbing collision energy, and the weight gain of an automobile body can be avoided while the safety is improved.

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