Ball indenter in Rockwell hardness test - Material Science

Q.  Which of the following statements is/are false?

1. Ball indenter in Rockwell hardness test is made of diamond
2. Brale indenter in Rockwell hardness test is made of diamond
3. Micro hardness test is used to measure hardness of thin brittle materials
- Published on 06 Aug 15

a. Only 1
b. Only 2
c. Only 3
d. All the statements are false

ANSWER: Only 1

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    Discussion

  • vishal prajapati   -Posted on 04 Oct 17
    this method is wrong way to understand.
  • Sravanthi   -Posted on 06 Oct 15
    Micro hardness test is used to measure hardness of thin brittle materials. They use lighter loads and small indentations. They use 'Knoop' indentor and is diamond cone type.

    This test requires highly polished surfaces. Entire hardness range is covered under one scale.

    Applications: Checks hardness of watch gares, powder particles, razor blades. Checks different phases of microstructure.

    Knoop Hardness Number = P/ (L2 C)
    here,
    P = applied load
    L = length of longer diagonal
    C = constant value

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