Indentation microhardness conversion table

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The Vickers microhardness indentation test is used to measure the hardness of metals, alloys and other materials. The hardness value is determined by measuring the depth of a indentation resulting from forces applied through a diamond indenter. It is typically used in fields such as metallurgy and materials science.

The Vickers hardness testing system consists of a light microscope on which a sample is placed and a diamond indenter suspended by an adjustable lever. A pendulum weight is released, causing the diamond indenter to strike the surface of the sample. The depth of the indentation can then be measured using the microscope and is related to the hardness value of the sample.

The depth of indentation is used in calculating the hardness value using the following calculation:

Vickers hardness (HV):

((2 P) / (d2 microscopic area)) × 3.785

Where P is the load applied to the diamond indenter, and d is the length of the diagonal of the indentation.

The hardness values determined from the Vickers hardness test are usually given in the following scales:

• Vickers HV (Vickers Hardness Value)

• HV10 (HV divided by 10)

• Kg/mm2 (Kilograms-force/mm2)

• Knoop HK (Knoop Hardness Number)

• HRA (Hardness Rockwell “A” Scale)

• HRB (Hardness Rockwell “B” Scale)

• HRC (Hardness Rockwell “C” Scale)

The following table provides a conversion between the different Vickers hardness scales.

Vickers HV (Vickers Hardness Value) HV10 Kg/mm2 Knoop HK HRA HRB HRC

1 0.1 0.18948 445 1 80 24

2 0.2 0.37897 890 2 143 39

5 0.5 0.94743 2225 5 255 90

10 1.0 1.89487 4500 10 510 180

20 2.0 3.78975 9000 20 1020 360

30 3.0 5.68462 13500 30 1530 540

50 5.0 9.47437 22500 50 2550 900

100 10.0 18.9487 45001 100 5100 1800

The table above shows that hardness values determined from the Vickers hardness test can be converted from scale to scale with relative ease. It is important to remember that the scales differ in the magnitude of their values, so the same hardness value will appear differently depending on the scale used. For example, a hardness value of 100VHN is equivalent to 45001Kgf/mm2, whereas the same hardness value on the HRB scale would be 5100.

In conclusion, the Vickers hardness test is an effective method of determining the hardness of materials. The hardness values are given in several different scales which makes them easier to compare with other material properties. The table above gives an overview of the conversions between the different scales.

The conversion table for Vickers Microhardness is a convenient tool for measuring and comparing the hardness of various materials. It is useful for determining the strength of materials at different temperatures and pressures and is often used in the manufacturing and research industries.

The table lists hardness values in two scales, Vickers and Knoop. Both measure the same physical property, but represent it differently. The Vickers scale is based on a traditional diamond pyramid shaped test indenter which is expected to penetrate into the material under test. The Knoop indenter has an elongated diamond shaped tip that produces indentations which are much deeper than those produced with the Vickers indenter.

The table is accurate, as it provides results from standard testing methods, performed under specific conditions and under specific loads. The results are then converted into standard Vickers or Knoop hardness numbers. In addition to the conversion table, other related tables are also available for general purposes. These tables compare hardness of specialized materials and characterize their performance under different conditions.

The Vickers Microhardness Conversion Table is an essential tool for materials engineers and metallurgists who are involved in research and development of new materials as well as in the manufacturing of products. It helps to ensure that the materials used in production meet the necessary strength requirements, as well as to provide a basis for comparison between materials and their performance.