钒氮钢晶内铁素体长大模型  

Model of idiomorphic ferrite growth in a vanadium-nitrogen steel

作　　者：刘宏玉[1,2] 刘建华 李海波[1] 陈小龙 王洪利[1] 唐历 

机构地区：[1]武汉科技大学理学院应用物理系,武汉430081 [2]冶金工业过程系统科学湖北省重点实验室,武汉430081 [3]攀枝花新钢钒股份有限公司技术质量部,四川攀枝花617062

出　　处：《材料科学与工艺》2010年第6期777-781,共5页Materials Science and Technology

摘　　要：为研究钒氮钢的显微组织细化机制,采用扫描电镜及能谱仪分析了夹杂物类型及尺寸,建立了基于夹杂物形核的晶内铁素体等温长大模型.基于此模型计算了钒氮钢奥氏体化后在873 K及823 K等温不同时间产生的晶内铁素体体积分数,并与金相显微镜的实测结果进行了对比分析.结果表明:模型能较好地描述晶内铁素体长大规律;相同等温时间,873 K形成的晶内铁素体体积分数高于823 K的;随转变温度降低,晶内铁素体体积分数计算值小于实测值,主要原因在于随温度降低,VN或V(C,N)不仅在MnS上析出量增多,而且也在MnS之外析出并成为晶内体素体核心.In order to investigate the refining mechanism of microstructures in vanadium-nitrogen steels, the sizes and nature of the inclusions were determined by means of scanning electron microscopy and its attached energy dispersive X-ray analysis unit. A model that described the isothermal growth of idiomorphic ferrite was built based on nucleation of inclusion. Based on this model, the volume fractions of idiomorphic ferrite, which were isothermally produced at 873 K, 823 K for different time after austenization, were calculated and compared with the results of metalloscope measurement. The results indicated that the model can well describe the growth law of idiomorphic ferrite. During the same isothermal time, the volume fraction of idiomorphic ferrite formed at 873 K was greater than that at 823 K. As the transformation temperature decreased, the calculated value of volume fraction of idiomorphic ferrite was smaller than measured value, which is resultant from more VN or V （C, N） particles not only precipitating on MnS inclusions, but also doing outside them as the nuclei of idiomorphic ferrite.

关 键 词：晶内铁素体 长大动力学 夹杂物 形核 

分 类 号：TG111.5[金属学及工艺—物理冶金]