Hardness testing method

Abstract

The invention relates to a hardness testing method. The hardness testing method comprises the following steps of: (1) impacting the surface of a to-be-tested sample by using an impact body with kinetic energy E, enabling the impact direction of the impact body to be perpendicular to the surface of the sample, and leaving an impact indentation on the surface of the to-be-tested sample; (2) measuring the size of the impact indentation in the step (1), and calculating the surface area S of the impact indentation; and (3) calculating a hardness value H of the to-be-tested sample according to a calculation formula shown in description. The operability, applicability and testing efficiency of the hardness testing method are improved, and the hardness testing method is efficient, good in repeatability and applicable to hardness measurement of large thin-walled samples.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for testing hardness. Background technique [0002] According to the JJG 1011-2006 standard, hardness refers to "the ability of a material to resist one or more effects such as elastic deformation, plastic deformation, and scratches." Hardness is an important index to measure the mechanical properties of metal materials. At the same time, hardness and strength have a certain corresponding relationship. Compared with strength tests, hardness tests are low in cost, high in efficiency, and can be less destructive. [0003] Commonly used hardness of metal materials includes Brinell hardness, Rockwell hardness, Vickers hardness, Leeb hardness, Shore hardness, etc. More commonly used is the static loading hardness test, that is, Rockwell hardness, Brinell hardness, and Vickers hardness, whose values ​​indicate the ability of the material surface to resist the intrusion of hard object...

AI Technical Summary

Problems solved by technology

However, the detection of Leeb hardness and Shore hardness has high requirements on the wall thickness and weight of the workpiece. For some thin-walled workpieces that cannot be coupled to eliminate the impact of vibration, the rebound speed of the impact device will be affected due to the vibration generated during the workpiece detection. Or height, which directly leads to large detection errors and poor repeatability, which has certain limitations

[0004] In practical engineering applications, there are a large number of thin-walled and large-scale metal materials that need to be tested for hardness. For such large-scale thin-walled workpieces, the current detection method is mainly the Leeb hardness detection method, and the operability of other detection methods is poor. Application limited occasions

When the test piece is not coupled, the Leeb hardness is only suitable for workpieces with a thickness greater than 25mm, and a large number of large workpieces less than 25mm cannot be detected by coupling

In the detection of the hardness of such large workpieces whose wall thickness is less than 25mm that cannot be coupled, there is still the problem of poor detection

[0005] To sum up, up to now, there is still a lack of accurate and convenient measurement methods for on-site detection of thin-walled large workpieces. People expect to obtain an on-site detection method for thin-walled metal materials with strong operability and good repeatability.

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