A method for classification of hyper/hypoeutectic al-si alloy modification based on image processing technology

Abstract

The invention discloses a hyper / hypoeutectic Al-Si alloy metamorphic grading method based on image processing technology, which has the following steps: successively through uniform size, grayscale processing, filtering processing, self-adaptive binarization processing, foreground and background Transformation, filter processing, hole filling processing and area denoising processing are used to process the image, and the sum of the areas of each connected domain in the foreground is counted as the foreground area. According to the ratio of the foreground area to the area of ​​the processed image, the image is divided into hypereutectic aluminum Silicon alloys or hypoeutectic Al-Si alloys; metamorphic grading of the original pictures of hyper / hypoeutectic Al-Si alloys. The present invention carries out accurate shape description and accurate pixel-level digital measurement on the Al-Si alloy metallographic structure such as eutectic and primary silicon geometric parameters and distribution, and uses it as a classification and grading standard to greatly improve the practical application Grading accuracy and reliability in the scene.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a hyper / hypoeutectic Al-Si alloy modification and classification method based on image processing technology. Background technique [0002] As a traditional metal material, cast aluminum alloy is widely used in aviation, aerospace, automobile, machinery and other industries due to its characteristics of low density, high specific strength and high thermal conductivity. Among them, Al-Si alloy has excellent mechanical properties and casting properties. , good corrosion resistance, wear resistance and heat resistance and occupy a large proportion. Coarse polygonal primary silicon and long needle-like eutectic silicon exist in the cast Al-Si alloy structure, which severely splits the alloy matrix, significantly reduces the mechanical properties, especially reduces the plasticity and wear resistance, and also deteriorates the machinability of the alloy. . Therefore, improv...

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Problems solved by technology

Therefore, this method of qualitative judgment is relatively subjective, and it is easy to introduce human errors in metallographic analysis.

At the same time, traditional quantitative metallographic methods mostly use manual calculations, relying on experimenters to eliminate objects that are not expected to be measured in the image based on experience, observe and measure with the naked eye, and then calculate and measure the results. Although it has the advantages of simplicity, economy and intuition, However, the measurement results are completely dependent on the experience and subjective judgment of the measurer, which will produce a large number of human errors, and the efficiency is extremely low, which cannot adapt to the rapid development of scientific research and production.

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