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Pearlite spheroidization grading method based on contour tracing

A technology of contour tracking and grading method, which is applied in the direction of material analysis, analysis material, and measuring device by optical means, which can solve the problems of being easily interfered by human factors and difficult to realize automatic grading of computer pearlite metallographic photos, etc. Reduce human interference, improve accuracy and automation, consistent results

Active Publication Date: 2013-04-03
国能锅炉压力容器检验有限公司
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Problems solved by technology

The results of such ratings are easily disturbed by human factors, and it is not easy to realize the automatic rating of pearlite metallographic photos by computer

Method used

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  • Pearlite spheroidization grading method based on contour tracing
  • Pearlite spheroidization grading method based on contour tracing
  • Pearlite spheroidization grading method based on contour tracing

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] The present invention is based on contour tracking to the grading method of pearlite spheroidization, such as figure 1 shown, including the following steps:

[0021] Use the Olympus inverted metallographic microscope (model PMG3-613U) with a digital camera with a metallographic camera system (resolution 1024*768) to take metallographic digital photos of the boiler heating surface tubes. The material of the boiler heating surface tubes It is 12Cr1MoV steel. Read the photo into the computer memory, record the file name of the photo, and convert the photo type from true color to grayscale. The metallographic photo image is as follows: figure 2 shown.

[0022] Determine the grayscale threshold of the pearlitic steel photo to be tested. The gray threshold value is the threshold value of the photo, which is the minimum value among the threshold values ​​calcu...

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Abstract

The invention relates to a pearlite spheroidization grading method based on contour tracing. The method comprises the steps of firstly, performing metallographic phase digital photograph to pearlitic steel to be measured, and converting metallographic phase photo type into gray scale from true color, secondly, fixing the gray scale threshold value of the photo of pearlitic steel to be measured, thirdly, performing binary processing to the image of a metallographic phase photo, fourthly, identifying contours of pearlite zones of a binary image through a contour tracing method based on a line segment table, fifthly, selecting three largest pearlite zones, scanning the three largest pearlite zones through a scanning spot counter, and taking a pearlite zone with the smallest scale value of black pixel values as a pearlite spheroidization criterion, and sixthly, fixing the grade of the pearlitic steel according to the pearlite spheroidization criterion. The method realizes the computerization of pearlite spheroidization grading, reduces man-made interference factors, is consistent in grading results, and improves the accuracy and the automation degree of pearlite spheroidization grading.

Description

technical field [0001] The invention belongs to the technical field of material inspection and measurement, and relates to a method for metallographic analysis and evaluation, in particular to a method for grading pearlite spheroidization based on contour tracking. Background technique [0002] At present, the steel used for boiler heating surface tubes in thermal power plants is generally pearlitic steel, and the metallographic photos show black pearlite and white ferrite. In the long-term high-temperature operation of pearlitic steel, tissue aging occurs, which is generally called pearlite spheroidization. This change is reflected in the metallographic photograph as a black block of pearlite that gradually disappears from the inside. [0003] Mature metallographic analysis software generally adopts auxiliary grading methods for spheroidization grading in power plants. This method mainly compares the metallographic photo to be identified with the standard metallograph...

Claims

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Application Information

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IPC IPC(8): G01N21/84
Inventor 郑相锋王庆牛晓光李文彬徐雪霞范辉王强
Owner 国能锅炉压力容器检验有限公司
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