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Brinell hardness tester is mainly used to test the hardness of materials such as cast iron, steel, non-ferrous metals and soft alloys, and is widely used in metallurgy, forging, electric power, petroleum machinery, rail vehicles, automobiles, military equipment and other industries. Brinell hardness tester, Rockwell hardness tester and Vickers hardness tester are three hardness testers commonly used in the metal industry. Computerized Metallographic Microscope TIME-40MW https://onlinemachinemfr.com/product/computerized-metallographic-microscope-time-40mw/
The principle of the Brinell hardness test: Apply a test force to a cemented carbide ball of a certain diameter and press it onto the surface of the sample. After the specified holding time, remove the test force and measure the diameter of the indentation on the sample surface. The indentation is regarded as It is a sphere with a certain radius, and the surface area of the indentation is calculated by the average diameter of the indentation and the diameter of the indenter. Digital Rockwell Hardness Tester TIME6102 https://onlinemachinemfr.com/product/digital-rockwell-hardness-tester-time6102/
When conducting Brinell hardness test, certain standards need to be followed, which are summarized as follows:
The surface of the sample should be flat and smooth, and there should be no scale and external dirt, especially no grease. The surface of the sample should be able to ensure accurate measurement of the indentation diameter.
When preparing the specimen, the influence of factors such as overheating or cold working on the surface properties of the specimen should be minimized.
The thickness of the specimen should be at least 8 times the indentation depth. After the test, if there is visible deformation on the back of the sample, it indicates that the sample is too thin.
The test is generally conducted at room temperature of 10~35℃. The test temperature with strict temperature requirements is 23±5℃.
In order to ensure that the largest possible representative sample area is tested, a large diameter indenter should be selected as much as possible.
When the sample size allows, priority should be given to using a ball indenter with a diameter of 10 mm for testing.
It should be placed firmly on the test bench. The space between the back of the specimen and the test bench should be clean and free of external dirt (scale, oil, dust, etc.). Place the sample firmly on the test bench to ensure that no displacement occurs during the test.
Make the indenter contact the surface of the sample, and apply the test force perpendicularly to the test surface without impact or vibration until the specified test force value is reached. The time from the beginning of adding force to the completion of application of all test forces should be between 2 and 8 seconds. The test force holding time is 10 ~15 s. For materials that require a longer test force holding time, the allowable error of the test force holding time should be within 2 s.
During the entire test, the hardness tester should not be subject to shock and vibration that would affect the test results.
The distance between the center of any indentation and the edge of the specimen should be at least 2.5 times the average diameter of the indentation.
The distance between the centers of two adjacent indentations should be at least 3 times the average diameter of the indentations.
The indentation diameter should be measured in two mutually perpendicular directions. Calculate Brinell hardness using the average of the two readings. Digital Brinell Hardness Tester TIME6203 https://onlinemachinemfr.com/product/digital-brinell-hardness-tester-time6203/
