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建立了奥氏体不锈钢的Fe、Cr二元热力学模型,并采用连续相场法模拟合金的调幅分解过程,通过MATLAB进行编程计算。结果表明,调幅分解组织各向同性,组织特征由合金成分决定。Fe、Cr含量相等时,两相呈相互交错的网状结构;当二者不相等时,以多数相为基体,少数相为孤立的球状组织。调幅分解分为早期、中期和晚期3个过程。早期主要为成分波长的调制,中间成分的概率密度函数随着时间的增加而减小;中期为两相分离阶段,合金成分由平均向两边分离;后期主要以粗化为主,中间成分对应的密度下降。Cr含量为0.5%的中间成分概率密度函数明显高于其他两种,且合金组织尺度要比其他合金粗大。几种合金的析出相体积分数变化趋势基本一致,早期析出相体积分数为0%,中期迅速增加,后期缓慢增加。
The binary thermodynamic model of Fe and Cr for austenitic stainless steel was established. The phase modulation decomposition process of the alloy was simulated by the continuous phase field method and programmed by MATLAB. The results show that the amplitude-modulated tissue is isotropic, the organizational characteristics of the alloy composition. When the contents of Fe and Cr are equal, the two phases are interlaced with each other. When the two are not equal, most of the phases are matrixes and the few are isolated spherical structures. AM decomposition is divided into early, middle and late three processes. In the early stage, the component wavelength was mainly modulated. The probability density function of the middle component decreased with the increase of time. In the middle stage, the phase composition was separated from the average on both sides. In the later stage, Decreased density. The probability density function of the intermediate component with 0.5% Cr is obviously higher than the other two, and the size of the alloy is larger than other alloys. The variation trend of the volume fraction of precipitated phase of several alloys are basically the same. The volume fraction of precipitated phase in the early phase is 0%, rapidly increasing in the middle period and slowly increasing in the late stage.