3. What are the different types of indenters used in hardness testing?
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Rockwell Hardness Test.
Rockwell Superficial Hardness Test.
Vickers Hardness Test.
Knoop Hardness Test.
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Two types of indenters are used: a 1/16” diameter steel ball (used for surface hardnesses of brasses, aluminum sheet, etc.) and the N-Brale penetrator. This Brale penetrator is like the one used in the standard Rockwell hardness tests except the spherical end is shaped to higher tolerances.
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