Overview of Video Measurement Vickers Hardness Tester

Video measurement of Vickers hardness tester is performed on various series of Vickers hardness testers, and can be directly measured on the display screen through the CCD color camera optical interface. It increases the speed and flexibility of testing, improves measurement accuracy, reflects the clarity of image quality, reduces manual operation errors of the eyepiece system, and can meet various microhardness testing requirements.

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　　Error analysis of Vickers hardness tester
1. The deviation of the angle between the two opposing surfaces of the diamond indenter from the standard value results in a larger hardness measurement error angle α, and the measured hardness value is lower than the true hardness value. JJG334-1993 "Diamond indenter verification regulation" stipulates that the angle between the two faces of a diamond pyramid should be 136 ± 0.5 ° for the Vickers indenter; The small load and micro Vickers indenter should be 136 ± 0.25 °.
2. The hardness measurement error caused by the transverse blade of the indenter, due to the transverse blade of the indenter, causes the indentation to become rectangular, resulting in an increase in the diagonal length of the measured indentation and a decrease in hardness value, leading to negative hardness measurement error. Within the scope of microhardness testing, the influence of the indenter blade is very significant. JJG334-1993 "Diamond indenter verification regulation" stipulates that the length of the transverse edge at the top of the diamond pyramid indenter should not exceed 2um for Vickers indenters, and should not exceed 1um for small loads and micro Vickers indenters.
3. The hardness measurement error caused by different sample materials shows that the indentation shapes of different materials are different, which makes it difficult to determine the true tip of the indentation diagonal, resulting in hardness measurement errors.
4. The hardness measurement error caused by the surface roughness of the sample not meeting the regulations. The smaller the surface roughness of the sample, the clearer the edge of the indentation, and the more stable the measurement of the diagonal length of the indentation. Therefore, a more accurate and stable hardness value can be obtained.
5. The hardness measurement error caused by the shape of the sample not meeting the regulations, and the reduction of the sample thickness to a certain extent, will result in a decrease in the hardness value. When the surface of the sample is not flat, the hardness value varies with the diameter of the sample surface. GB/T4340.1-1999 "Metallic Vickers Hardness Test Part 1: Test Method" stipulates that the thickness of the specimen or test layer should be at least 1.5 times the diagonal length of the indentation, and there should be no visible deformation marks on the back of the specimen after the test; For the results tested on the test samples, a correction factor table should be used for correction; For specimens with small cross-sections or irregular shapes, they can be embedded or tested using a dedicated support platform.
6. The hardness measurement error caused by the distance between indentation and indentation to the edge of the specimen not meeting the requirements. If the distance between indentation is too close, the hardness value will increase; If the distance between the indentation and the edge of the specimen is too close, it will reduce the hardness value. GB/T4340.1-1999 "Metallic Vickers Hardness Test Part 1: Test Method" stipulates that the distance between the center of any indentation and the edge of the specimen should be at least 2.5 times the diagonal length of the indentation for steel, copper, and copper alloys, and at least 3 times the diagonal length of the indentation for light metals, lead, tin, and alloys; The distance between the centers of two adjacent indentations should be at least 3 times the diagonal length of the indentation for steel, copper, and copper alloys, and at least 6 times the diagonal length of the indentation for light metals, lead, tin, and alloys. If the sizes of two adjacent indentations are different, the distance between the indentations should be determined by the larger indentation.
　　Can Vickers hardness tester measure nitride parts
Can Vickers hardness tester be used for measuring nitride parts? Many engineers believe that due to the presence of a hardened layer on the surface of nitride parts, and the Vickers hardness tester using rebound testing, it is difficult to reflect the true hardness of nitride parts. Therefore, overall, Vickers hardness testers are not suitable for measuring nitride parts.
The Vickers hardness tester is only used to measure nitride parts when there is absolutely no way, but the data measured by Vickers hardness can only be used as a rough understanding and cannot be used as standard measurement data. To use it as the final measurement data, the furnace sample should be used as the standard, including structure, hardness, brittleness level, etc.