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以高温合金普遍含有的金属元素为基础,进行二元相热力学分析与计算,得到各可能反应生成物的吉布斯自由能随温度的变化,通过分析可知控制冷却温度可得到所需的物质相。Cr3C2吉布斯反应焓的变化(△G)在升温过程中的负值最小,在升温过程中一直存在,可看出,Cr3C2是最稳定的,生成该相的可能性较其他物质更大。结果显示,C首先和Cr反应,然后剩余的C再和Nb、Fe等反应;在反应过程中加入不同量的Cr、Nb影响了生成物相;Cr、Nb含量的增加促进了Cr3C2、Cr4C和Cr7C3等化合物相的生成。
Based on the metal elements commonly contained in superalloy, the thermodynamic analysis and calculation of the binary phases are carried out to obtain the Gibbs free energy of each possible reaction product as a function of temperature. It can be seen from the analysis that by controlling the cooling temperature, the desired material phase . Cr3C2 Gibbs reaction enthalpy changes (△ G) in the heating process of the smallest negative during the warming has been, we can see, Cr3C2 is the most stable, the possibility of generating this phase is greater than other substances. The results show that C first reacts with Cr and then the remaining C reacts with Nb, Fe and so on. Different amounts of Cr and Nb affect the product phase during the reaction. The increase of Cr and Nb content promotes the formation of Cr3C2, Cr4C and Cr7C3 and other compounds generated phase.