A detection method for solidified dendrite structure of steel continuous casting slab
A technology of dendritic structure and detection method, which is applied in the field of iron and steel metallurgical continuous casting production quality detection, can solve the problems of small detection sample, difficult to reflect the solidification structure and defects of the slab, and narrow range.
Active Publication Date: 2019-07-19
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
[0009] Dendrite corrosion detection generally requires cutting the slab into small pieces for detection, which is only suitable for local cross-section detection. It has the disadvantages of small test samples and narrow range, and it is difficult to reflect all information on the solidified structure, morphology and defects of the slab.
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[0038] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0039] refer to figure 1 In this embodiment, a method for detecting solidified dendrite structure of steel continuous casting slab is provided, the method includes the following steps:
[0040] Step 1. Cut the sample along the cross-section on the steel continuous casting slab, and the minimum size of the surface to be tested of the sample is greater than or equal to 10 cm.
[0041] Specifically, a continuous casting slab cross section with a thickness of 2 cm was cut from a continuous casting slab of heavy rail steel U75V with a cross-sectional size of 28 cm × 38 cm. Measuring surface) size is 14cm×19cm. Take one of them as a sample for experiment.
[0042] Step 2. Clean the sample. Specifically include the following sub-steps:
[0043] Step 2.1, using a ...
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Abstract
The invention relates to the technical field of iron and steel metallurgical continuous casting production quality detection, and in particular to a method for detecting the solidification dendrite structure of steel continuous casting blanks. In the present invention, a new corrosive agent (composed of 2%-6% picric acid, 3%-8% sodium dodecylbenzene sulfonate, and 86%-95% water by mass percentage), corrosion temperature ( 60-70℃) and etching time (30-40min) to form dendrite structure during the detection process, it is suitable for dendrite detection method of large-sized cross-sections with a minimum size of the surface to be measured greater than or equal to 10cm. Secondly, after obtaining the image of the surface to be tested and clearing it, it can be used to quantitatively determine the area ratio of the columnar crystal area, mixed crystal area and equiaxed crystal area on the surface to be tested, thus realizing the continuous casting billet dendrites. Quantitative detection of crystal structure morphology.
Description
technical field [0001] The invention relates to the technical field of iron and steel metallurgical continuous casting production quality detection, in particular to a method for detecting solidified dendrite structure of steel continuous casting slabs. Background technique [0002] The continuous casting process of steel is essentially a process of continuous cooling and solidification of molten steel. When the molten steel is cooled by the crystallizer, a large number of nucleation occurs at the contact position between the molten steel and the surface of the mold, thereby forming a small equiaxed crystal region on the surface of the slab. The first nucleated grains face fierce competition in the subsequent growth process. Under the joint action of heat flow and molten steel flow, some grains whose growth direction is relatively consistent with the heat flow direction grow faster, inhibiting the growth of a large number of grains, making large Some grains die in the compet...
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IPC IPC(8): G01N21/84G01N1/32
CPCG01N1/32G01N21/84
Inventor 罗森吴国荣王朝辉陈天明王冰钰陈永王卫领朱苗勇
Owner NORTHEASTERN UNIV LIAONING