Method for measuring microhardness of curved surface

A technology of microhardness and curved surface measurement, applied in the direction of testing material hardness, etc., can solve problems such as inability to meet measurement requirements and inconvenience, and achieve the effect of simple and reliable measurement method, convenient measurement and small error

Active Publication Date: 2013-10-02
东台城东科技创业园管理有限公司
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Problems solved by technology

When measuring the microhardness of an inclined surface and a spherical surface, a special fixture is required; when measuring the microhardness of a spherical surface, it is also necessary to know the curvature of the spherical surface and consult the standard comparison table, which is very inconvenient; and for irregular curved surfaces, The microhardness measured by measuring the average value of the diagonal line usually has an error of more than 10%, which cannot meet the measurement requirements

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  • Method for measuring microhardness of curved surface
  • Method for measuring microhardness of curved surface
  • Method for measuring microhardness of curved surface

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Embodiment Construction

[0020] In order to better explain the implementation details of the present invention, and to compare the accuracy of the measurement results, a method for measuring the microhardness of curved surfaces according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Take the measurement of the microhardness of two different samples as an example. Both samples are made of LY2 aluminum alloy. The surface to be tested of sample 1 is flat, and the surface to be tested of sample 2 is an irregular curved surface. Both samples are polished after undergoing the same heat treatment process. Processing, therefore, the microhardness of the two specimens is the same.

[0022] The microhardness tester used for the measurement is HXD-1000TMSC / LCD hardness tester, which can take pictures of the samples to be tested. First, the microhardness of sample 1 was measured by conventional methods. The load used in the test was 100 grams, ...

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Abstract

The invention discloses a method for measuring microhardness of a curved surface, which comprises the following steps: performing microhardness experiment to a to-be-detected sample; taking a picture of indentation obtained from the experiment for sampling; leading the picture of the indentation to AUTOCAD software; connecting the edges of the indentation by a short line segment or a short circular arc to form a closed area; measuring out the area of the closed area by utilizing the measuring function of the AUTOCAD software; obtaining the microhardness through computation. Through the adoption of the method, the microhardness of any shape of curved surfaces can be obtained, and the method can be applied to the measurement of microhardness of the surface of metal and ceramic components.

Description

technical field [0001] The invention belongs to the field of material characterization, and in particular relates to a material surface integrity characterization technology. Background technique [0002] Vickers hardness represents a standard of material hardness, which was first proposed by British scientist Vickers. With a load of 49.03-980.7N, press square-conical diamonds with an included angle of 136° into the surface of the material, and after holding for a specified time, measure the diagonal length of the indentation, and then calculate the hardness according to the formula. It is suitable for hardness determination of larger workpieces and deeper surface layers. Vickers hardness still has small load Vickers hardness, the test load is between 1.961N and 49.03N, it is suitable for the hardness determination of thinner workpieces, tool surfaces or coatings; micro Vickers hardness, that is, microhardness, test Load <1.961N, suitable for hardness determination of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/42
Inventor 戴峰泽于璐温德平罗密
Owner 东台城东科技创业园管理有限公司
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