复合微合金化高强度低合金钢奥氏体相中碳氮化物析出热力学数值模拟

Numerical simulation of thermodynamic for carbonitride precipitation in austenite of complex microalloyed high strength and low alloy steels

基于多元第二相固溶析出理论开发了定量计算复合微合金化高强度低合金(HSLA)钢奥氏体相中碳氮化物析出热力学数值模拟计算模型。采用所开发的模型,模拟了奥氏体中多元碳氮化物和AlN相互作用时的析出开始温度,对不同奥氏体化温度下及不同化学成分的C-Nb-V-Ti-Al-N体系的微合金钢的奥氏体平衡成分、碳氮析出物成分和摩尔分数等进行了模拟和分析。

A mathematical model which simulates complex precipitation bearing high strength and low alloy（HSLA） steel has been developed on a theoretical basis. By using of the developed model, the precipitation start temperature for complex carbonitride considering A1N was predicted. And the estimation of the equilibrium compositions of the austenite and carbonitride, as well as the mole fractions of each phase in C-Nb-V-Ti- AL-N microalloyed steels at different austenitising temperatures and different chemical compositions was simulated and analyzed.