Preparation method of metallographic sample of cast iron oxidizing layer
A technology of sample preparation and oxide layer, applied in the preparation of test samples, etc., can solve the problems of tissue change, easy peeling off by abrasion, easy tissue change, etc., and achieve the effect of convenient operation.
Active Publication Date: 2011-05-11
FEILONG AUTO COMPONENTS CO LTD
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Problems solved by technology
The oxide layer of cast iron exists on the surface of the cast iron. In order to ensure the detection accuracy, the crude metal sample needs to be taken directly from the workpiece. The cast iron oxide layer is easy to peel off when it is worn, and the structure is easy to change when heated. The existing conventional metallographic Neither the sample preparation method nor the standard has formulated a targeted preparation method for the characteristics of the cast iron oxide layer. Therefore, the following problems often occur in the preparation of the existing metallographic samples of the cast iron oxide layer: 1. It is difficult to find the correct method during the preparation process Detection surface, 2. The oxide layer is easily damaged and peeled off during sampling, grinding, and polishing. 3. The oxide layer is easily heated to cause tissue changes. 4. The inlay material is easy to melt and contain the contaminated oxide layer during grinding or polishing.
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[0017] The step of metallographic sample preparation method of cast iron oxide layer of the present invention is:
[0018] 1. Manually cut the sample: cut the sample on the cast iron workpiece with a hand-held hacksaw. The cut sample is a hexahedron with a right-angled trapezoid on the top and bottom. The side where the right-angled side of the sample is located, so that the oxidation layer of the sample to be tested can be easily identified and located; when cutting the cast iron workpiece with a saw, the frequency is 2 times per second, and the slower cutting speed can avoid the heat of the workpiece from affecting the oxide layer Organizational structure, to avoid peeling off the oxide layer.
[0019] 2. Grinding the grinding surface of the sample: Use a grinder to grind any one of the right-angled trapezoidal top and bottom surfaces of the hexahedron sample, remove the burrs on the surface, and make the right-angled trapezoidal surface and the oxidation layer to be tested ...
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The invention discloses a preparation method of a metallographic sample of a cast iron oxidizing layer, comprising the steps: (1) manually cutting a sample; (2) grinding the abrasive surface of the sample; (3) embedding the sample; (4) grinding the abrasive surface of the embedded sample; (5) manually polishing the abrasive surface of the embedded sample: (6) manually polishing the abrasive surface of the embedded sample by sequentially utilizing a plurality of pieces of waterproof abrasive paper from thick to thin, and rotating the embedded sample by 90 DEG in the same direction as changing the abrasive paper once; and (7) polishing the abrasive surface of the embedded sample. In the steps, the embedded sample needs to be always ground in a single direction from the oxidizing layer to betested to the cast iron layer on the abrasive surface. The preparation method prevents the metal tissue of the cast iron layer from disturbing the oxidizing layer to be tested and is easy to align toa grinding direction and convenient for operation.
Description
technical field [0001] The invention relates to the technical field of metallographic sample preparation, in particular to a method for preparing a metallographic sample of an oxide layer of cast iron. Background technique [0002] When detecting the thickness of the metal oxide layer, the thickness of the oxide layer can be detected by making a metallographic sample of the metal oxide layer. The existing metallographic sample preparation process generally involves rough grinding, fine grinding, polishing, corrosion, etc. Several professional processes are used to make metallographic samples. The metallographic samples can be observed under a microscope to measure the thickness of the oxide layer on the metal. Because the size and shape of the obtained metal rough samples are often not suitable for grinding or polishing, Before grinding, it is generally necessary to inlay the rough metal sample by an inlay machine in order to meet the subsequent sample preparation steps. Th...
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IPC IPC(8): G01N1/28G01N1/32
Inventor冯长虹王瑞金杨兰芹杨双杰卓玉侠李艳平
OwnerFEILONG AUTO COMPONENTS CO LTD