Microhardness Testing and Analysis
Knoops and Vickers Methods for Metals and Alloys
The Vickers microhardness test utilizes a diamond indenter to make an indentation within a series of light load specifications (ASTM E-384) . The measurements are converted into a hardness value, which is useful for testing a wide range of materials. Test samples should be prepared with a highly polished finish to allow accurate measurement of the size of the indention.
The Knoop microhardness test measures mechanical hardness, and is used mostly for very brittle materials or thin sheets, where only a small indentation may be made for testing purposes. This testing is especially useful for alloy steels and irons or where testing for near surface hardness is needed.
Unlike the Vickers test where the indentation length on the vertical and horizontal axes are measured and averaged, the Knoop method only uses the long axis. This measurement is then converted to a Knoop hardness number using a chart.
RELATED HARDNESS TESTS-METALS
Brinell Hardness (500, 1000, 1500, 3000Kgf)
Rockwell Hardness (A, B, C, F, L, 15N, 30N, 45N, 15T, 30T, 45T, E, 15Y)
Knoop Microhardness (10-1000gf)
Macro-Vickers Microhardness (1-10kg)
Vickers Microhardness (10-1000gf)
RELATED HARDNESS TESTS-NON-METALLICS
Durometer Hardness Test/Shore Hardness (A, D, M)
Rockwell Hardness (E, R, L, M) Non-conditioned lab
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