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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