A method for quantitatively describing the morphology characteristics of the solidification structure of continuous casting slabs of varieties of steel
A technique for quantitative description of solidified structure, which is applied in the field of describing the characteristics of solidification structure and morphology of continuous casting slabs of various types of steel, and can solve the problems of different morphology and bias.
Active Publication Date: 2017-05-03
CHONGQING UNIV
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In addition, the morphology of the grains in the columnar grain region is anisotropic compared to the equiaxed grain region and the chilled layer (the grains inside both are equiaxed, but the morphology is different). The morphology characteristics of the grains and the random comparison of the spacing will definitely be biased
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[0020] 1) Use the hydrochloric acid water (industrial hydrochloric acid) solution with an acid liquid volume ratio of 1:0.5-1.5 to conduct hot pickling experiments on the cross-section of the continuous casting slab of the variety steel. The acid etching temperature is in the range of 60°C to 80°C. The time is 5-35min; after hot pickling, use a high-definition digital camera to take pictures to obtain the overall morphology of the solidified structure of the cross-section continuous casting slab; as figure 1 shown. Since different components of the continuous casting slab have different reactions to the acid etching solution, the solidification structure of the cross section of the continuous casting slab will appear after pickling; it is convenient to take clear photos and select measurement points later.
[0021] 2) figure 1 The solidification structure in the crystal is composed of three different regions: chilling layer, columnar crystal and equiaxed crystal. The outside ...
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The invention discloses a method for quantitatively describing topographic characteristics of solidification structures of a variety steel continuous casting billet. According to the method, the cross section of the variety steel continuous casting billet is subjected to hot pickling, with hydrochloric acid solution having a 1:0.5-1.5 volume ratio at the temperature of 60 DEG C to 80 DEG C for 5-35 minutes; a high-definition digital camera is used for taking a picture of overall appearance; more than one measurement point is selected from the picture of overall appearance to obtain typical solidification structure of each point; fractal dimension of each of different types of solidification structures is calculated by a box-counting method or / and a perimeter-area method in the fractal theory so as to quantitatively describe the topographic characteristics of the variety steel continuous casting billet. The method has the advantages that the topographic characteristics of the solidification structures of the continuous casting billet are more elaborately indicated, and the higher the fractal dimension, the higher the complexity of the appearance of grains and the higher self-similarity level of the grains; the topographic characteristics of the solidification structures in different areas of the continuous casting billet can be comprehensively compared; better correlation with internal quality and defects of the continuous casting billet can be achieved.
Description
technical field [0001] The invention relates to the technical field of metallurgical engineering, in particular to a new method for describing the morphology characteristics of the solidification structure of continuous casting slabs of varieties of steel. Background technique [0002] The solidification structure of the variety steel continuous casting slab reflects its overall structural characteristics, so it is closely related to the quality of the continuous casting slab and the final product. According to the morphology of the grains, the solidification structure of the continuous casting slab is usually divided into three regions: the chill layer, the columnar grain region and the equiaxed grain region. How to accurately describe the characteristics of coagulation tissues in different regions becomes the basis for researching, controlling and optimizing them. The predecessors mainly reflected the structural characteristics of the solidified structure through the prop...
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IPC IPC(8): G01B11/24G01N21/88
Inventor 侯自兵陈晗毛伊航张波赵尹文光华唐萍
Owner CHONGQING UNIV