Robert Smith and his colleague, George Sandland developed a hardness test in the year 1921 called Vickers method or hardness testing.
The hardness test was developed at Vickers Limited, and it serves as the alternative test to another hardness test called Brinell hardness method which is used to determine the ability of a material to resist indentation. Vickers Hardness is also known as microhardness testing.
The Vickers Hardness strategy is basically user-friendly than any other hardness testing strategies. This is because the calculations that are required do not depend on the intensity of the indenting material.
Also, then the indenter is versatile, as it can work for any kind of material regardless of its hardness.
The elementary principle of its application, like all other measures of material’s hardness, is to consider a material’s capacity to resist indentation.
The Vickers hardness is very suitable for metals. In fact, it has a wide scale compared to some hardness testing methods. However, it is basically applicable to thin sections, small parts, or depth work.
It’s unit of hardness
Vickers Hardness has a unit that is regarded to as Vickers Pyramid Number (HV). This number, HV can be changed to Pascal’s unit. However, it is necessary that one does not confuse this with pressure, as they both use the same units. The load or material over the indentation determines the hardness number, not the area that is normal to the perpendicular force. That proves that it is not pressured.
In the Vickers test, the indentation is usually very small and this makes it applicable for various applications. It can be used to measure the outward segment of small areas, or small parts by using different microstructure, or even measuring how the deep the hardening is, by taking out a part and making a set of various indentations basically to describe the characteristics of the variation in hardness.
How is it implemented?
A Vickers test procedure requires creating an indentation with a specific quantity of loads by making use of diamond indenter for ASTM E – 384, ASTM E-92 and EN ISO-6507. The diamond indentation is measured and changed to a Vickers hardness value.
Vickers method can be considered to be applicable to test various types of elements or materials so far, the test samples carried out are all properly and carefully prepared.
What are materials it can be used to test?
It can be used to test a wide range of materials including ceramics, composites, metals, and even application that include testing various microstructures individually, case depth measurement and etc.