Brinell Hardness Tester: Used To Determine The Hardness Of Materials With Hardened Steel Ball Indentor

 

Brinell Hardness Tester

Brinell Hardness Tester is used to determine the hardness of a metal by measuring the size of an indentation left by an indenter. It is frequently used to determine the hardness in circumstances where the overall material properties are being ascertained. It is desirable that the test load are limited to an impression diameter in the range of 2.5 to 4.75 mm. The test for Brinell Hardness is performed using a verified machine that indents a sample surface with a tungsten carbide ball. The diameter of the indentation is measured after the force is removed. A Brinell hardness test involves two steps. First, the test force is applied to the surface for a period of one to eight seconds. Then, the specimen is allowed to hold in the indentation for an additional 10 to fifteen seconds.

The Brinell Hardness Tester uses a 10mm hardened steel ball. The test is conducted by inserting a hardened steel ball into the test specimen. The force applied to the indenter produces an indentation that measures the diameter of the material. The resulting diameter is used to determine the Brinell hardness. The Brinell hardness is measured in HBW, short for Hardness Brinell Wolframkarbidhartmetall ("Wolframkarbidhartmetall" is German for Tunsten Carbide). This method of measuring hardness is recommended for materials that cannot be tempered. For this reason, it is important to use a hardened steel ball.

The next step in the Brinell hardness testing process is to prepare the specimen. Using a non-ferrous material, you will need to cut an indentation in the surface of the sample. Then, using a semi-automatic Brinell hardness tester, you will be able to see the indentation under a microscope or eyepiece. The test is more sensitive than other methods, but you should still prepare a specimen for this type of test.

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