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钢中合金元素的添加会不同程度的形成碳、氮化物进而提高钢材的组织与性能,为研究重压下铸坯析出物的析出行为,本文以规则溶液下亚点阵模型为基础,计算热力学平衡状态下热力学参数。通过热力平衡方程组,得出一定温度下,析出物摩尔分数、亚点阵中不同元素原子分配比,利用能谱分析及透射电镜观察验证这种析出模式。计算结果表明,不同压下制度铸坯中析出物主要为(Nb,Ti)(C,N)析出,尺寸在30~40 nm左右。
The addition of alloying elements in the steel will form carbon and nitride to different degrees to improve the microstructure and properties of the steel. In order to study the precipitation behavior of the slab under heavy pressure, based on the sub-lattice model under the regular solution, Thermodynamic parameters at equilibrium. Through the thermodynamic equilibrium equations, the molar fraction of precipitates and atomic distribution of different elements in sub-lattices are obtained at a certain temperature, and this precipitation pattern is verified by energy-dispersive spectroscopy and transmission electron microscopy. The calculated results show that the precipitates in the slab under different reduction system are mainly precipitated by (Nb, Ti) (C, N) with the size of about 30-40 nm.