Method for detecting grain boundary cementite of steel cord wire rod
A detection method, cementite technology, applied in the direction of measuring device, test sample preparation, sampling, etc., can solve the problems of quality judgment and scientific research impact, and achieve the advantages of observation and rating, high definition and strong contrast Effect
Pending Publication Date: 2022-01-25
ZENITH STEEL GROUP CORP +1
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Problems solved by technology
There are several methods of etchant for grain boundary cementite at home and abroad, and there are certain differences in the grain boundary cementite corroded by each method, which has a great impact on quality judgment and scientific research
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Embodiment
[0021] Embodiment: The present invention will be described in detail by taking LX86A cord steel as an example.
[0022] A method for detecting grain boundary cementite in steel cord wire rods, the specific implementation steps are as follows:
[0023] (1), sample preparation: in the step (1), use a metallographic cutting machine to intercept a 1-2cm long sample for thermal inlaying, rough grinding by a belt machine, and then use 180 mesh, 600 mesh, 1000 mesh gold Grind the inspection surface of the sample with phase sandpaper on the metallographic grinding and polishing machine in sequence. Every time you change the sandpaper for grinding, you should ensure that the scratches of the previous sandpaper are ground away, and finally you can get only the finest sandpaper. scratches on the surface to be inspected; after grinding, use a metallographic polishing agent with a particle size of 3.5 μm to polish the surface to be inspected of the sample, and finally obtain a metallograph...
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The invention relates to a method for detecting grain boundary cementite of a steel cord wire rod. The method comprises the following steps: S1, cutting a sample with the length of 1-2cm, and thermally embedding; s2, performing rough grinding through a belt sander, then, polishing a to-be-detected face of the sample through a metallographic polishing agent with the particle size being 3.5 micrometers, and obtaining a bright and smooth to-be-detected face; s3, immersing the polished sample into a metallographic coloring agent prepared from a water mixed solution of picric acid, sodium hydroxide and a washing agent; s4, putting the eroded sample into a water bath heating box for thermal dyeing; s5, washing the test surface of the heated and dyed sample in clear water, and blow-drying; and S6, observing the metallographic structure of the sample under a metallographic microscope. After the metallographic coloring agent is adopted to erode the sample, the obtained grain boundary cementite is high in definition; the contrast between the cementite and the background is strong, so that observation and rating are more facilitated; the cementite and other tissues are dyed into different colors, so that the cementite and other tissues are distinguished; and the corrosion effect is good, and repeatability is high.
Description
technical field [0001] The invention relates to the technical field of metallographic structure detection of metal materials, in particular to a method for detecting grain boundary cementite of steel cord wire rods. Background technique [0002] Grain boundary cementite is a structural defect of steel. Generally speaking, the higher the temperature at the end of hot working and the slower the subsequent cooling, the more serious the network carbide will be. The presence of network carbides weakens the bonding force between metals and reduces the mechanical properties of steel. In particular, it reduces impact toughness and increases brittleness. [0003] Steel cord wire rod is a fine-gauge steel wire strand or rope made of high-quality high-carbon steel with a brass-plated surface and a special purpose. It is mainly used as a skeleton material for automobile and aircraft tires and other rubber products. Since the filaments of Φ0.15-0.38mm must be drawn and then twisted into...
Claims
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IPC IPC(8): G01N21/84G01N1/28G01N1/30G01N1/32
CPCG01N21/84G01N1/286G01N1/30G01N1/32G01N2001/2873
Inventor 杜佳美杨博彭磊
Owner ZENITH STEEL GROUP CORP