连铸过程铌钛微合金钢中第二相复合析出模型  

Second Phase Compound Precipitation Model for Nb-Ti Microalloy Steel in Continuous Casting Process

作　　者：朱正海[1,2] 肖丽俊[2] 彭世恒[2] 王强[2] 干勇[2] 

机构地区：[1]安徽工业大学冶金与资源学院,安徽马鞍山243002 [2]钢铁研究总院连铸技术国家工程研究中心,北京100081

出　　处：《钢铁研究学报》2014年第7期18-22,27,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51304003);国家科技支撑计划资助项目(2006BAE03A)

摘　　要：针对连铸过程铌钛微合金钢中第二相在固液两相区和奥氏体内的复合析出行为,通过近似处理建立了多元第二相复合析出的热力学模型,并利用模型研究了X80,E36,J55钢中第二相的析出行为。结果表明:在凝固过程不同的Ti/N摩尔比对液相中Ti,C,N元素的变化影响显著,先析出的第二相对后析出的第二相影响显著,成分高低的差异不但导致第二相析出量的不同,而且也导致析出相种类的不同,碳氮化物在析出的过程中C,N元素摩尔分数的变化受析出温度和钢中元素含量的影响。For the compound precipitation in austenite and solid/liquid two-phase zone, the thermodynamic model of multiple second phase compound precipitation in Nb-Ti microalloyed steel in continuous casting process was es- tablished by approximate treatment. The secondary phase precipitation in X80, E36, J55 was studied by model. The results show that different Ti/N mole ratios in the solidification process have significant impact on the change of the elements Ti, C and N in liquid phase. Early precipitated second phase significantly influences the late precipitated second phase, the difference of different contents not only leads to the different second phase precipitation, but also leads to different types of precipitation. During the precipitation process of carbonitride, the mole fraction of C and N is effect by precipitated temperature and element content.

关 键 词：连铸 微合金钢 碳氮化物 析出 热力学模型 

分 类 号：TF777[冶金工程—钢铁冶金]