碳含量对钢中碳化铌在奥氏体中固溶度积的影响  

Effect of Carbon Content on the Solubility of Niobium Carbide in Austenite

作　　者：米永峰[1] 曹建春[1] 张正延[1] 亓海全[1] 周晓龙[1] 雍岐龙[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《钢铁》2012年第3期84-88,共5页Iron and Steel

摘　　要：以析出热力学为基础,同时考虑碳含量对碳和铌在奥氏体中活度的影响,对含铌高碳钢中碳化铌在奥氏体中的固溶度积与碳含量的变化关系进行了理论计算,得到含铌高碳钢中碳化铌在奥氏体中的固溶度积随碳含量的变化关系;利用物理化学相分析方法对碳的质量分数为0.75%的高碳钢进行了析出相定量分析。通过对比发现,推导得到的高碳钢中碳化铌在奥氏体中的固溶度积与试验结果吻合得较好,说明该公式可以用来研究高碳钢中碳化铌在奥氏体中的的沉淀析出规律。Based on thermodynamics,considering the effect of carbon content on the activities of carbon and niobium in austenite,the relationship between solubility product of niobium carbide in austenite of high-carbon steel containing niobium and concentration of carbon was derived.Quantitative analysis of precipitates in high-carbon steel containing carbon with mass percent as 0.75% was conducted using physicochemical phase analysis method.By companion,it is found that the calculated results for the solubility product of niobium carbide are more close to the experiment results,which indicates that the solubility of niobium carbide in austenite is applicable to high carbon steel.

关 键 词：固溶度积 碳化铌 碳含量 活度 

分 类 号：TG142.25[一般工业技术—材料科学与工程]