Vickers Hardness Test
* Working principle of vickers hardness test is similar to Brinell hardness test
- In this test vickers indenter is use which is made of diamond in the form of square based pyramid
-The include angle between the opposite faces of the pyramid indenter is 136 degree
- 136 degree angle is considered because it correspond to most desirable ratio of indentation diameter to ball diameter
Test procedure :
- Test procedure is similar to Brinell hardness test
- In this as indentation is very small surface need to polish by 0,00,000,etc
- The vickers hardness tester is semi-automatic in operation
- After an impression has been made on specimen the diagonals of square impression are measured with the help of special measuring microscope
- To convert measured diagonals into hardness number standard chart are use
Advantages :
- Because of square impression more accurate results are obtained as compared to circular impression
- Due to small size of indenter impression are small which does not affect the life of component
- As indenter are made of diamond it does not deform while testing of hard material
- Thin material can be tested easily
- Life of indenter is more
Limitation :
- As indenter size is small test not recommended to measure hardness of heterogeneous materials, casting component, porous power metallurgy component
- While testing surface must be free from dust an polished properly which is time consuming process
- More surface finish is required
Application :
- Use for measuring hardness of soft as well as hard materials, hardened steel, ferrous as well as non ferrous alloy, thin plate, razor blade etc
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