钢中夹杂物形貌特征的定量描述方法及其与上浮速度的关系  

Quantitative description of morphology characteristics of inclusions in steel and its relationships with floating velocity

作　　者：郭洛方[1] 李宏[2] 王耀[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《冶金分析》2012年第9期1-6,共6页Metallurgical Analysis

基　　金：国家自然科学基金资助项目(No.51074020)

摘　　要：本文依据分形理论分析,举例探讨了不规则形貌夹杂物分形维数及动力直径的计算方法,且通过水模拟实验验证了采用分形维数和动力直径来定量描述不规则形貌凝聚体上浮速度的可靠性及准确度。结果表明:通过对钢中不规则形貌非金属夹杂物的扫描电子显微镜图像和金相图像进行计算机图像处理后,采用单一像素点覆盖和盒维数求斜率法均可精确地求出其分形维数及其相应的动力直径;采用分形维数和动力直径计算的凝聚体上浮速度与实验值基本一致;利用分形维数和动力直径来定量描述不规则形貌夹杂物是准确可行的。Analysis in this article was based on fractal theory. The calculation method for fractal di- mensions and hydrodynamic diameter of inclusions with irregular morphology were discussed by exam- ples, and through water mould experiments, the reliability and accuracy was verified for quantitative description of the floating velocity of aggregates with irregular morphology by the fractal dimension and hydrodynamic diameter. The results showed that： the fractal dimension and hydrodynamic diame- ter of non-metallic inclusions with irregular morphology in steel could be accurately calculated by cov- ering-method with single pixel and box dimension for slope method after their scanning electron micro- graph and metallographic image had been processed by computer; the floating velocity of aggregates calculated by fractal dimension and hydrodynamic diameter was consistent with the experimental val- ues; it was accurate and feasible to quantitatively describe the inclusions with irregular morphology by fractal dimension and aerodynamic diameter.

关 键 词：非金属夹杂物 分形维数 动力直径 上浮速度 夹杂物形貌 

分 类 号：TG115[金属学及工艺—物理冶金]