Detection method of internal defects of thin-gauge cold rolled steel plates for automobiles

A cold-rolled steel plate and internal defect detection technology is applied in the field of detection of internal defects in thin-gauge automotive cold-rolled steel plates. It can solve problems such as difficult positioning, long detection time, and inability to identify, so as to achieve rapid analysis and positioning, and shorten the search time. Effect

Inactive Publication Date: 2016-07-06
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to provide a detection method for internal defects of thin-gauge cold-rolled steel sheets for automobiles, to solve the existing technical problems that the internal defects of cold-rolled steel sheets for automobiles with a thickness of 0.5-1.5mm cannot be identified, difficult to locate, and take a long time to detect

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  • Detection method of internal defects of thin-gauge cold rolled steel plates for automobiles
  • Detection method of internal defects of thin-gauge cold rolled steel plates for automobiles
  • Detection method of internal defects of thin-gauge cold rolled steel plates for automobiles

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Embodiment Construction

[0026] refer to figure 1 , figure 2 , image 3 , Figure 4 , the present invention will be further described in conjunction with embodiment. It should be understood that the following specific embodiments are only used to illustrate the present invention but not to limit the scope of the present invention.

[0027] In this embodiment, the sample plate to be tested is a cold-rolled steel plate for automobiles with a thickness of 1.15 mm.

[0028] a. Cut the cold-rolled steel plate to be tested into a 300×200mm basic model, and use a metal lettering pen to mark a detection area of ​​50×50mm on the surface of the basic model.

[0029] b. Scan a 50mm×50mm grid area with an ultrasonic scanning microscope with a model PVASAM300ScanningAcousticMicroscope and a transducer frequency of 110MHz to obtain a clear ultrasonic two-dimensional image of the internal defects of the sample, see figure 1 , the scattered black dots in the figure are the distribution positions of the inclusio...

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Abstract

The invention relates to a detection method of internal defects of thin-gauge cold rolled steel plates for automobiles to mainly solve the technical problem of unable identification, difficult positioning and long detection time of internal defects of present cold rolled steel plates for automobiles, with the thickness of 0.5-1.5mm. The detection method of internal defects of thin-gauge cold rolled steel plates for automobiles comprises the following steps: 1, marking a detection area on a plate sample to be detected; 2, positioning the defect position of the plate sample through using an ultrasonic scanner; 3, cutting the plate sample containing a defect part to make a metallographic sample; 4, observing the defect part of the metallographic sample by using an optical microscope; and 5, carrying out element analysis on the defect part of the metallographic sample by using an energy dispersive spectrometer. Defects are analyzed and detected through adopting combination of ultrasonic scanning and positioning, the optical microscope and the energy dispersive spectrometer to realize positioning and detection analysis of the internal defects of the thin-gauge cold rolled steel plates for automobiles; and the method has the advantages of simplicity, fastness, high precision, and meeting of mass quality examination requirements of the cold rolled steel plates for automobiles.

Description

technical field [0001] The invention belongs to the technical field of physical detection of iron and steel materials, and in particular relates to a detection method for internal defects of cold-rolled steel plates, in particular to a detection method for internal defects of cold-rolled steel plates for thin-gauge automobiles. Background technique [0002] Cold-rolled steel sheets for automobiles with a thickness of 0.5~1.5mm are mostly used for important parts such as automobile outer panels and inner linings. It is necessary to strictly control their internal quality defects, such as internal micro-cracks, internal delamination, internal inclusions, slag inclusions, etc. However, the defects inside these steel plates are difficult to be found by conventional physical microscopic inspection methods during the product inspection process. [0003] In the prior art, using an optical microscope or an electronic scanning microscope can easily find the surface defects of metal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01N21/88G01N23/22
Inventor 周丽萍刘学伟吴小红王海军
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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