CN113822857A - Method for counting carbide content of high-nickel-chromium cast iron roller, storage medium and system - Google Patents
Method for counting carbide content of high-nickel-chromium cast iron roller, storage medium and system Download PDFInfo
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- CN113822857A CN113822857A CN202110959055.5A CN202110959055A CN113822857A CN 113822857 A CN113822857 A CN 113822857A CN 202110959055 A CN202110959055 A CN 202110959055A CN 113822857 A CN113822857 A CN 113822857A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/136—Segmentation; Edge detection involving thresholding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30136—Metal
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Abstract
The invention discloses a method, a storage medium and a system for counting the carbide content of a high-nickel-chromium cast iron roller, wherein the method comprises the following steps: collecting an image: collecting a metallographic structure picture of the high-nickel-chromium cast iron roller by adopting a metallographic microscope; pretreatment: preprocessing a metallographic structure picture; finding carbides: extracting the outline of the pretreated metallographic structure picture, and extracting the outlines of all white pixel areas; and (3) calculating the carbide proportion: and calculating the ratio of the area of the white pixel region to the pixel area of the metallographic structure picture, namely the carbide ratio value. According to the statistical method of the technical scheme, the time for manually counting the carbide content of the roller is greatly shortened through the computer technology, and the statistical accuracy is improved, so that the efficiency and accuracy for selecting the roller with better quality are improved, and the production efficiency and quality are improved.
Description
Technical Field
The invention relates to the technical field of metal material analysis, in particular to a method, a storage medium and a system for counting the carbide content of a high-nickel-chromium cast iron roller.
Background
For rolling of plates, high-speed steel rolls, high-chromium cast iron rolls and high-nickel-chromium cast iron rolls are commonly used, wherein the high-nickel-chromium cast iron rolls have the characteristics of relatively low production cost, good processability, good wear resistance, good thermal fatigue resistance and the like, and are widely applied to steel rolling production. The metallographic structure uniformity, the grain size and the carbide proportion of the high-nickel-chromium cast iron roller influence the hardness and the wear resistance of the roller, the content of the carbide is one of important indexes for performance evaluation in the metallographic structure analysis process, and the content statistics of the carbide is difficult due to the dispersity and the irregularity of the carbide.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for counting the carbide content of a high-nickel-chromium cast iron roller, which can greatly shorten the time for manually counting the carbide content of the roller and improve the accuracy of counting.
Another objective of the present invention is to provide a computer readable storage medium storing a computer program corresponding to the above method and a statistical system capable of implementing the statistical method.
The technical scheme is as follows: the invention relates to a method for counting the carbide content of a high-nickel-chromium cast iron roller, which comprises the following steps of:
collecting an image: collecting a metallographic structure picture of the high-nickel-chromium cast iron roller by adopting a metallographic microscope;
pretreatment: preprocessing a metallographic structure picture;
finding carbides: extracting the outline of the pretreated metallographic structure picture, and extracting the outlines of all white pixel areas;
and (3) calculating the carbide proportion: and calculating the ratio of the area of the white pixel region to the pixel area of the metallographic structure picture, namely the carbide ratio value.
Further, the pretreatment in the pretreatment step includes binarization, median filtering and erosion treatment which are sequentially performed.
Further, the binarization method is an overall threshold method.
Further, in the carbide searching step, a Robert operator is adopted for contour extraction.
Furthermore, in the step of acquiring the image, the pixel size of the metallographic structure picture is larger than or equal to 2592 × 1944 pixels.
The computer-readable storage medium of the invention stores a computer program which is configured to implement the above-mentioned method for counting the carbide content of a high-nickel-chromium cast iron roll when running.
The statistical method for the carbide content of the high-nickel-chromium cast iron roller comprises a computer and a metallographic microscope, wherein the metallographic microscope is electrically connected with the computer, and the storage medium is arranged.
Furthermore, the model of the metallographic microscope is BXJ-2000B.
Has the advantages that: compared with the prior art, the invention has the following advantages: the time for manually counting the carbide content of the roller is greatly shortened through a computer technology, and the counting accuracy is improved, so that the efficiency and accuracy for selecting the roller with better quality are improved, and the production efficiency and quality are improved.
Drawings
FIG. 1 is a photograph of the original metallographic structure of a roll according to an embodiment of the present invention;
FIG. 2 is a metallographic structure picture after binarization according to an embodiment of the invention;
FIG. 3 is a photograph of a median filtered metallographic structure according to an embodiment of the invention;
fig. 4 is a metallographic structure picture after contour extraction according to the embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The method for counting the carbon content of the high-nickel-chromium cast iron roller comprises the following steps:
collecting an image: collecting a metallographic structure picture of the high-nickel-chromium cast iron roller by adopting a metallographic microscope;
pretreatment: preprocessing a metallographic structure picture;
finding carbides: extracting the outline of the pretreated metallographic structure picture, and extracting the outlines of all white pixel areas;
and (3) calculating the carbide proportion: and calculating the ratio of the area of the white pixel region to the pixel area of the metallographic structure picture, namely the carbide ratio value.
According to the method for counting the carbon content of the high-nickel-chromium cast iron roller, the outline of a white pixel in a metallographic structure picture of the metal roller is quickly extracted through a graph preprocessing method and an outline extraction algorithm of a computer, the preprocessed white pixel represents carbide, and the ratio of the area of the white pixel area to the area of the image is calculated to represent the proportion of the carbide content of the roller. The statistical method can rapidly realize the content statistics of the dispersed irregular carbides, save the labor cost, improve the accuracy of the statistics and further improve the efficiency and the quality of plate rolling.
The preprocessing process includes binarization, median filtering, and erosion processing, which are sequentially performed. The binaryzation can compress the information capacity of the metallographic structure picture, and the subsequent calculated amount is reduced. The binarization may adopt an adaptive threshold or an integral threshold method, in this embodiment, an integral threshold method is adopted, and the original metallographic structure picture shown in fig. 1 is binarized and then is shown in fig. 2. Referring to fig. 3, the median filter is used to suppress salt-pepper noise in the metallographic structure picture, and the erosion process further eliminates noise in the image to segment out independent image elements. The binarized threshold value and the convolution kernel of the corrosion treatment can be selected according to empirical values obtained by a plurality of test tests, and a metallographic structure picture extracted through the outline after the corrosion treatment is shown in fig. 4.
In this embodiment, in order to ensure the accuracy of contour positioning of white pixel parts, i.e. carbides, the operator of the contour extraction algorithm is preferably a robert operator, and the pixel area of the metallographic structure picture is preferably 2592 × 1944 pixels or more.
According to the computer readable storage medium of the embodiment of the invention, the computer program instantiated by the statistical method is stored. The system for counting the carbide content of the high-nickel-chromium cast iron roller comprises a computer and a metallographic microscope, wherein the metallographic microscope is electrically connected with the computer, and the computer comprises a computer program stored with the computer program corresponding to the counting method. In this embodiment, the metallographic microscope is preferably a model BXJ-2000B metallographic microscope.
Claims (8)
1. A statistical method for carbide content of a high-nickel-chromium cast iron roller is characterized by comprising the following steps:
collecting an image: collecting a metallographic structure picture of the high-nickel-chromium cast iron roller by adopting a metallographic microscope;
pretreatment: preprocessing a metallographic structure picture;
finding carbides: extracting the outline of the pretreated metallographic structure picture, and extracting the outlines of all white pixel areas;
and (3) calculating the carbide proportion: and calculating the ratio of the area of the white pixel region to the pixel area of the metallographic structure picture, namely the carbide ratio value.
2. The statistical method for the carbide content of the high-nickel-chromium cast iron roll according to claim 1, wherein the pretreatment in the pretreatment step comprises binarization, median filtering and corrosion treatment which are sequentially performed.
3. The statistical method for the carbide content of the high-nickel-chromium cast iron roller according to claim 2, wherein the binarization method is an integral threshold method.
4. The method for counting the carbide content of the high-nickel-chromium cast iron roll according to claim 1, wherein in the carbide searching step, a Robert operator is used for contour extraction.
5. The method for counting the carbide content of the high nickel chromium cast iron roller according to claim 1, wherein in the step of collecting the images, the pixel size of the metallographic structure picture is 2592 pixels by 1944 pixels or more.
6. A computer-readable storage medium, storing a computer program, wherein the computer program is configured to perform the method for counting the carbide content of a high-nickel-chromium cast iron roll according to any one of claims 1 to 5.
7. A statistical method for carbide content of a high nickel-chromium cast iron roller is characterized by comprising a computer and a metallographic microscope, wherein the metallographic microscope is electrically connected with the computer, and the computer comprises the storage medium according to claim 6.
8. The statistical method for the carbide content of the high-nickel-chromium cast iron roller according to claim 7, wherein the metallographic microscope is of a model BXJ-2000B.
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| CN202110959055.5A CN113822857A (en) | 2021-08-20 | 2021-08-20 | Method for counting carbide content of high-nickel-chromium cast iron roller, storage medium and system |
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| CN202110959055.5A CN113822857A (en) | 2021-08-20 | 2021-08-20 | Method for counting carbide content of high-nickel-chromium cast iron roller, storage medium and system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001150006A (en) * | 1999-11-30 | 2001-06-05 | Kubota Corp | Reduction roll and surface layer of reduction roll |
| CN106248460A (en) * | 2016-10-09 | 2016-12-21 | 江苏科技大学 | A kind of assay method of two phase stainless steel phase content |
| CN108830849A (en) * | 2018-06-28 | 2018-11-16 | 东北大学 | A kind of rotten stage division of mistake/hypoeutectic Al-Si alloy based on image processing techniques |
| CN111220441A (en) * | 2020-03-24 | 2020-06-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Chromium-containing pig iron metallographic corrosive agent and metallographic structure display method |
| CN112906639A (en) * | 2021-03-19 | 2021-06-04 | 北京科技大学 | Image recognition method and device for ferrite in chromium alloy steel |
-
2021
- 2021-08-20 CN CN202110959055.5A patent/CN113822857A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001150006A (en) * | 1999-11-30 | 2001-06-05 | Kubota Corp | Reduction roll and surface layer of reduction roll |
| CN106248460A (en) * | 2016-10-09 | 2016-12-21 | 江苏科技大学 | A kind of assay method of two phase stainless steel phase content |
| CN108830849A (en) * | 2018-06-28 | 2018-11-16 | 东北大学 | A kind of rotten stage division of mistake/hypoeutectic Al-Si alloy based on image processing techniques |
| CN111220441A (en) * | 2020-03-24 | 2020-06-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Chromium-containing pig iron metallographic corrosive agent and metallographic structure display method |
| CN112906639A (en) * | 2021-03-19 | 2021-06-04 | 北京科技大学 | Image recognition method and device for ferrite in chromium alloy steel |
Non-Patent Citations (1)
| Title |
|---|
| 许可贵;程志国;刘剑威;赵春燕;: "一种耐磨复合板的制造工艺方法研究", 焊接, no. 08 * |
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