System Based On Image Processing, Quantitative Metallographic Analysis

Metallographic analysis refers to inspecting and evaluating material microstructure with all kinds of analyzing apparatuses. Not only it can reveal the relation between microstructure and properties, evaluate the reliability of the technological methods, but also it is the important means to inspect the product quality, develop new material and technology. Material microstructure can be analyzed conveniently, precisely and quantitatively. Relationship among technological factors, microstructures and properties can be deeply understood. In general, it is of great significance to production and researches.With frame gather card and CCD, metallographic image which can be processed by computer is acquired after a serials of the applications of digital image technique such as gray level transformation, dichotomy, noise eliminating, dilation and erosion, image enhancement, boundary detection, etc. An automatic quantitative metallographic analysis system is developed with Visual C++6.0 to realize the measuring of the size of the metal crystalline grain, evaluation the proportion of the second tissue of the metal, micro hardness. With three-level Browser/Server mode and Active Server technology, the system gives the remote user the applying service through network to communicate and analyze the image information.The main research content of the article is involved as follows:(1) The research and discussion of the quantitative metallographic analysis methods and the measuring methods of micro hardness.(2) The application of digital image technique in metallographic image preprocess such as gray level transformation, dichotomy, noise eliminating, dilation and erosion, image enhancement, boundary detection, etc. Theapplication of the wavelet and multi-resolution analysis in metallographic image procession to improve the measuring accuracy and efficiency. The application of the region growth and mathematical morphology in analyzing image parameters to improve the flexibility and exaction.( 3 ) Establishing the main structure of the metallographic analysis system(software structure and hardware structure).( 4) Based on Windows developing platform, the system is module designed and developed by object-oriented language Visual C++.( 5 ) Establishing the measuring metallographic expert database with multi-modes express, obverse-contrary deduce method, fuzzy mathematical model pattern matching based on regulations.Its reliability, accuracy and reappearance can satisfy requirement of quantitative analysis of metallographic microstructure. The system has great theoretical and practical significance in setting up quantitative relation among the composition, microstructure and mechanical property, selecting appropriate material, customizing suitable process and developing quantitative metallographic.