摘要
主要论述了准确表征钢中非金属夹杂物颗粒的三维分析技术:定电量非水电解提取—电镜观察法。试验研究了不同电解体系下非金属夹杂物的提取效果,确定了弱碱性的2%TEA非水电解液可适用于电解提取大多数的钢中非金属夹杂物颗粒;通过样品大小、电解量控制、电流大小等电解参数的确定,确保所提取的夹杂物颗粒在电镜下的显微分析和统计计算;利用磁选将夹杂物颗粒与碳化物进行无损分离后,避免碳化物的干扰,在电镜下呈现清晰的三维立体形貌,使夹杂物具有更加准确的类型、粒度大小和化学组成;统计多个连续视场内夹杂物颗粒的数量以及粒径,经过与电解质量的换算,得到单位体积的夹杂物颗粒数量和某一尺度区间内粒径分布。最后阐明了定电量非水电解提取—电镜观察法并不能完全取代传统的定量金相法,在夹杂物的表征过程中,两种方法有着不同的应用。
In this paper,a kind of three-dimensional analysis technology for characterizing non-metallic inclusion in steel was elaborated.It is the electron microscopy observation,namely the non-aqueous electrolysis extraction with a settled coulometric method.In the research,extraction effects of non-metallic inclusions in different electrolysis systems were studied,and it came to a conclusion that 2% alkalescent TEA non-aqueous electrolyte was applicable for extracting most of non-metallic inclusion particles in steel.And then,in order to insure the microscopic characterization and statistical calculation of inclusion particles,some electrolysis parameters should be confirmed,such as size of the sample,control of the electrolysis mass,electric current,etc.Furthermore,for preventing the disturbance of carbide and presenting clear three-dimensional appearance by microscopic characterization,magnetic separation was utilized to separate the inclusion particles from carbide,which was useful for getting more veracious types,particle sizes and chemical compositions of inclusions.Moreover,through calculation of quantity and particle size of inclusion in a continuous determinate field,a total quantity per unit volume or area and the particle size distribution of inclusions could be acquired by conversion with the electrolysis loss.Besides,the comparison between this method and a traditional quantitative metallography was also discussed.It was illuminated that both of them have their different applications in characterizing inclusions.
出处
《宝钢技术》
CAS
2011年第3期6-14,共9页
Baosteel Technology
关键词
非水电解提取
扫描电镜
显微分析
非金属夹杂物
microscopic analysis
nonaqueous electrolytic extraction
SEM
non-metallic inclusion
