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奥氏体不锈钢的敏化过程实质上是过饱和奥氏体沿晶界析出碳合化物(Fe、Cr)(23)_Co、同时溶质Cr、Ni和C在基体中重新分布的过程。本文作者对此进行了计算机模拟。模拟中认为;碳化物的析出过程受代位溶质的扩散控制,碳化物和奥氏体的界面达到动态的热力学平衡。在动态提供Fc-Cr-Ni-C多元系相平衡信息的条件下,确定扩散过程的边值;求解溶质在基体中的分布曲线;进而可以预测不锈钢的温度-时间-敏化(TTS)曲线.这一模型在奥氏体不锈钢中进行了具体应用和分析讨论,为不锈钢晶间腐蚀的贫铬理论提供了定量的理论依据。
The sensitization process of austenitic stainless steel is essentially the process of supersaturated austenite precipitation along the grain boundaries of carbon compounds (Fe, Cr) (23) _Co, while the solute Cr, Ni and C redistribution in the matrix. The author of this article conducted a computer simulation. It is considered in the simulation that the precipitation of carbides is controlled by the diffusion of the substitutional solute and the dynamic thermodynamic equilibrium is obtained at the interface between carbides and austenite. Determine the boundary value of the diffusion process under the condition of dynamically providing the phase equilibrium information of the Fc-Cr-Ni-C multicomponent system. Solve the distribution curve of the solute in the matrix, and then predict the temperature-time-sensitization curve of the stainless steel The model is applied and analyzed in austenitic stainless steel, which provides a quantitative theoretical basis for the chromium - depleted theory of stainless steel intergranular corrosion.