What is the indentation method of Rockwell hardness tester?- Trojan (Suzhou) material technology Co., Ltd.

What is the indentation method of Rockwell hardness tester?

25-09-2023

The indentation method of a Rockwell hardness tester is a key aspect of how this type of hardness testing works. The Rockwell hardness test measures the hardness of a material by determining the depth of penetration of an indenter into the material's surface. Here's how the indentation method of a Rockwell hardness tester typically works:

Initial Indentation: The test begins with the application of a minor load, often referred to as the "preload" or "minor load," on the indenter. This minor load is used to seat the indenter firmly against the material's surface.

Major Load Application: After the minor load is applied and the indenter is in contact with the material, a major load is applied on top of the minor load. This major load is typically significantly larger than the minor load.

Indentation Formation: The major load causes the indenter to penetrate into the material's surface, creating an indentation. The depth of this indentation is directly related to the hardness of the material. Softer materials will allow for deeper indentations, while harder materials will result in shallower indentations.

Load Removal: Once the major load has been applied for a specified dwell time (a brief period to allow for stabilization), it is removed, but the minor load is still maintained.

Depth Measurement: The depth of the indentation is then measured using a depth gauge or other measuring device. This depth measurement is used to determine the material's hardness according to the Rockwell hardness scale.

Hardness Calculation: The Rockwell hardness value is calculated based on the difference in depth between the indentation made by the major load and the indentation made by the minor load. The specific Rockwell scale used (e.g., Rockwell A, B, C) will determine the calculation formula.

The Rockwell hardness tester's indentation method is advantageous because it provides a rapid and accurate measure of hardness while being relatively non-destructive to the material being tested. The use of both a minor load and a major load helps stabilize the measurement and reduce the influence of surface roughness, making it a widely used method for hardness testing in various industries, including manufacturing, metallurgy, and quality control.