Mixed crystal degree automatic measurement and fine classification method for steel crystal grains, and system thereof

Abstract

The invention belongs to the analysis field of quantitative metallography on all-form crystal grains in a steel material microstructure and particularly relates to an automatic measurement and fine classification method for steel crystal grains, and a system thereof. According to the method, an image acquisition device acquires the original images of to-be-measured crystal grains of the steel material firstly, and then the original images are pre-processed by an image pre-processing module. The pre-processed images are subjected to the region labeling treatment by an automatic measurement module, and then the images of to-be-measured crystal grains can be obtained. After that, the geometry characteristic parameters of the images of to-be-measured crystal grains are extracted, and then the characteristic morphological parameters of target crystal grains are measured through the random field area algorithm. The area of crystal grains is obtained, and then the grain size of crystal grains and the mixed crystal degree (GME) of crystal grains can be figured out. The mixed crystal degree (GME) of crystal grains is automatically classified by an automatic classification module according to a most suitable threshold. In this way, the blank in measuring and classifying the mixed crystal degree of steel crystal grains in the prior art can be filled up. Meanwhile, the characterization precision of the images of steel crystal grains is up to plus / minus 0.001 [mu]m. Therefore, by adopting the above method and the above system, the characterization precision of the images of steel crystal grains is highest during the steel metallographic structure analysis process.

Description

technical field [0001] The invention relates to the field of quantitative metallographic analysis of steel material microstructure full-morphological grains, in particular to an automatic measurement and fine classification method and system for steel grain mixed crystals. Background technique [0002] With the rapid development of iron and steel material science and technology, the research and development of various steel materials has gradually been established on the basis of the quantitative relationship between composition, structure and performance. Method, through the quantitative analysis of the metallographic structure of various steel materials, especially the grain size and mixed crystal degree, the quantitative relationship between the microstructure and macroscopic properties was established. In order to ascertain the influence law of the grain size and distribution of all-form grains in steel on the strength / toughness of steel, especially the relevant influenc...

AI Technical Summary

Problems solved by technology

[0003] At present, since the existing quantitative metallographic analysis methods are not involved in the quantitative characterization and classification of the full-form grain size and mixed crystallinity of all steel products, the composition, process, structure and performance of new steel research and development At the time of control, this work is still in the preliminary exploration stage, and can only be carried out by manual or semi-manual measurement and analysis mode, and the evaluation standard of this mode is only "whether the mixed crystal phenomenon is serious" or the grain size of the steel to be tested. extremely bad

Here, "mixed crystals" generally refers to the phenomenon that the grain size distribution of steel is seriously uneven, but the degree of unevenness cannot be quantitatively characterized.

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