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What is the angle of indenter in Vicker’s hardness test?

What is the angle of indenter in Vicker’s hardness test? Correct Answer 136 degrees

In Vicker’s hardness test, a square pyramid-shaped indenter is used for indentation. This indenter is placed at an angle of 136 degrees between opposite faces. This angle was chosen as it approximates the most desirable ratio of indentation diameter to ball diameter in Brinell hardness test.

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