Cr-Nb-Fe-C体系二元相的热力学稳定性分析  

Analysis on Thermo-dynamic Stability of Cr-Nb-Fe-C System

作　　者：任海果[1] 侯军占[1] 赵志龙[1] 

机构地区：[1]西北工业大学机电学院,陕西西安710072

出　　处：《热加工工艺》2013年第2期9-11,14,共4页Hot Working Technology

基　　金："高档数控机床与基础制造装备"科技重大专项(20092X04006-042)

摘　　要：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 superalloys with generally contain elements, the binary intermetallic compound was analyzed, thus, the variation of Gibbs free energy with the temperature can be obtained. The results show that the necessary matters can be obtained by controlling the cooling temperature. In the reaction process, the minus value of the variation of Cr3C2 Gibbs free energy is minimum. The Cr3C2 always exists in the reaction process, which means that it is the stablest compound. At the same time, the results show that C and Cr react firstly, then the left C do not react with Nb and Fe until the former finishes. The different quantities of Cr and Nb influence the generation of compound phase. The increase of Cr and Nb can promote the reaction rate ofCr3C2, Cr4C, Cr7C3 and so on.

关 键 词：二元相 Cr-Nb-Fe—C体系 热力学 

分 类 号：TG111.3[金属学及工艺—物理冶金]