Thermodynamic description of the Fe-Cu-C system
Thermodynamic description of the Fe-Cu-C system
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Fe-Cu-C体系的热力学描述
DOI：
10.1016/j.calphad.2018.12.001
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发表时间：
2019-03-01
影响因子：
2.4
通讯作者：
Chang, Keke
中科院分区：
文献类型：
--
作者：
Chen, Leilei;Zhang, Zhenyu;Chang, Keke
铜作为铁碳合金中的添加剂，可以提高铁碳合金的强度和耐蚀性，在钢铁工业中具有重要的应用价值，因此铁-铜-碳系合金的研究也越来越多。为研究Cu对Fe-C系的影响提供热力学基础，采用CALPHAD（CALculation of PHAse Diagrams）方法对Fe-Cu-C三元系（包括Cu-C和Fe-C二元系）进行了热力学计算。Redlich-Kister模型，而不是在以前的工作中的修正准化学模型（MQM），被用来模拟液相。从以前的工作中的Fe-C系统中的液相的参数已被稍微修改，以更好地适应新的实验数据在高温下。设计了一个Fe/Cu/FeC0.05（wt%）扩散偶来进一步确定三元体系的相平衡。通过热力学优化，得到了Fe-Cu-C系的自洽参数。通过本热力学描述，相图、热力学性质和液相线投影的计算值与实验值之间具有良好的对应关系。
As an addition to the iron-carbon alloys to improve their strength and corrosion resistance, copper is of great importance for iron and steel industry and the Fe-Cu-C system has been extensively investigated. Aiming at a thermodynamic basis to investigate the effect of Cu addition on the Fe-C system, the CALPHAD (CALculation of PHAse Diagrams) approach was utilized to assess the ternary Fe-Cu-C system including the binary Cu-C and Fe-C systems. The Redlich-Kister model, instead of the Modified Quasichemical Model (MQM) in previous work, was used to model the liquid phase. The parameters of the liquid phase in the Fe-C system from previous work have been slightly modified to fit better with new experimental data at high temperatures. One Fe/Cu/FeC0.05 (in wt%) diffusion couple was designed to further determine the phase equilibria of the ternary system. A set of self-consistent parameters for the Fe-Cu-C system was obtained after thermodynamic optimization. Good correspondence between calculated and experimental values of phase diagrams, thermodynamic properties, and liquidus projections has been achieved by the present thermodynamic description.