Abstract
The method of identification of objects on images of the microstructure of cast iron with spherical graphite of the correct shape with uniform distribution is presented. Morphological analysis techniques were used to identify shrinkage pores and graphite inclusions in microstructure images. Geometric features of the shape of graphite inclusions were used as methods for identifying graphite, in particular, particle size analysis, which is widely used to identify various objects in computer microscopy. The computer analysis of the image was performed with the program ImageJ. To determine the pores against the background of graphite inclusions, two characteristics were used - the shape and size of the objects themselves. The pores, presented on the image, differ from graphite inclusions by a complex, fractal border and comparatively large areas. For the visualization of the research results, the combination of the graphite part with the calculation and analytical part was used. Such presentation of the results is the most significant and allows to perform the most correct evaluation of the graphitized cast iron microstructure in accordance with GOST 3443-87.
Highlights
The modern methods of computer microscopy allow you with a high degree of adequacy, mathematically, to describe the main dimensional and topological characteristics of the structure of constructional materials
Most frequently used methods of the study of dimensional and topological characteristics of cast irons are the methods of computer microscopy for structure images, obtained on modern digital optical microscopes [4,5,6,7,8,9]
The separate stages of the analysis of the initial image of the ductile cast iron microstructure, made to identify the shrinkage pores on the graphite phase background, are presented
Summary
The modern methods of computer microscopy allow you with a high degree of adequacy, mathematically, to describe the main dimensional and topological characteristics of the structure of constructional materials. The significant influence on the properties of graphitized cast irons comes from such parameters as distribution and shape of graphite inclusions These characteristics are difficult to describe objects and different researchers use different methods of their identification. Most frequently used methods of the study of dimensional and topological characteristics of cast irons are the methods of computer microscopy for structure images, obtained on modern digital optical microscopes [4,5,6,7,8,9] It is connected with a wide introduction into the production of digital microscopes, allowing to perform photo- and video-fixation of the studied materials’ structures, and to describe mathematically the studied objects. The purpose of this work is to develop the technique of identification for objects of the types of pores and gas inclusions for the development of the technology, managing cast iron structure and for the obtaining products with the specified properties from cast irons
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