The two letters "HV", standing for "Hardness according to Vickers"; 3. The applied test load in kgf; 4. According to ISO The dwell time of the test load, but only if this is not between 10 and 15 seconds uncommon in practice Examples HV30 …hardness value HV …as per Vickers 30 …with test load of 30 kgf or test force of Full service competence.
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Argentina - Vaccaro Hnos. Belgium - Struers S. Bosnia-Herzegovina - Bitus d. Brazil - Arotec Bulgaria - S. Technologies Ltd Canada - Struers Ltd. Priniotakis Scientific S. Ireland - Struers Ltd. Israel - Agentek Ltd. Italy - Struers S. Luxembourg - Struers S. Macedonia - Bitus d. Since the test indentation is very small in a Vickers test, it is useful for a variety of applications: testing very thin materials like foils or measuring the surface of a part, small parts or small areas, measuring individual microstructures, or measuring the depth of case hardening by sectioning a part and making a series of indentations to describe a profile of the change in hardness.
Sectioning is usually necessary with a microhardness test in order to provide a small enough specimen that can fit into the tester. Often the prepared samples are mounted in a plastic medium to facilitate the preparation and testing.
The indentations should be as large as possible to maximize the measurement resolution. Error is magnified as indentation sizes decrease The test procedure is subject to problems of operator influence on the test results.
Hardness is a critical property for many applications. Fortunately, there is a relatively easy method to measure the hardness of materials , called the Vickers Hardness test. Since different materials behave in different ways, there are three kinds of hardness that are typically measured. Depending on the material, they are:. The Vickers Hardness test measures the indentation hardness for small parts or thin sections of metals, ceramics, and composites — almost any type of material in fact.
The depth of indentation on the material gives the value of hardness for the specimen. In general, the smaller the indentation, the harder the object is. Hardness tests can be classified into micro-indentation tests and macro-indentation tests, depending on the force that is applied to the test material.
Micro-indentation tests typically use loads of up to gf, while macro-indentation tests use loads up to gf. The Vickers Hardness test and Knoop Hardness test are the most commonly used tests that can be used for both micro-indentation and macro-indentation. Vickers Hardness Test indentation examples — 3 materials of different hardness. Initially designed as a substitute for the Brinell method, which had a large indenter and the possibility of damage to the test-piece, and also the Rockwell method which used multiple test forces; the Vickers Hardness test is easy to use and offers a number of advantages over other hardness tests, such as:.
The test is implemented by pressing the diamond indenter into the surface under testing. The indenter is pyramid-shaped, with a square base and an angle of degrees between opposite faces. Typically, loads vary from 1 to kgf. The full load is normally applied for 10 to 15 seconds.
The measurements are made using built-in microscopes. Some more advanced testing scales use software to obtain faster and more accurate results.
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