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利用Thermo-Calc模拟软件,采用数值计算与实验相结合的方法,对马氏体时效硬化不锈钢中析出相类型及其变化规律进行分析。研究表明,1 050℃固溶1 h后试样冷却至室温时,基体为马氏体组织,无第二相析出;时效处理后有ε-Cu相、Nb的碳化物、LAVES相、M_(23)C_6和逆变奥氏体形成;实验发现700℃条件下,随时效时间延长,实验观察到的析出相平均尺寸增加,由6.3 nm长大到42.9 nm;对应条件下,动力学计算得到的富铜析出相尺寸误差为15%,说明数值模拟计算可以作为析出相实验研究的一种辅助手段。
Using Thermo-Calc simulation software, numerical analysis and experimental methods were combined to analyze the types of precipitates and their variation in martensitic stainless steel. The results show that when the sample is cooled to room temperature at 1 050 ℃ for 1 h, the matrix is martensite and no second phase is precipitated. After aging treatment, ε-Cu phase, Nb carbide, LAVES phase and M_ ( 23) C_6 and the formation of inverted austenite. The experimental results show that with the aging time prolonged at 700 ℃, the average size of precipitates increased from 6.3 nm to 42.9 nm. Under the corresponding conditions, the kinetic calculations , The size error of copper-rich precipitates is 15%, indicating that numerical simulation can be used as an auxiliary method for the experimental study of precipitates.