Hardness Measurement by Vicker Hardness testing Machine

This method of determining the hardness of a sample complete covers the procedure using Vicker hardness testing machine. This is a simple method and the complete procedure for performing this test is described below.

Experimental Work:

There were three samples in the experiment which were indicated by “Sample A”, “Sample B” and “Sample C”. Sample C was provided to me for hardness measurement. The apparatus required for this experiment is given below;

• Vicker Hardness Testing Machine


• Sand paper ( If sample surface is not clean)


• Sample

Procedure:

The procedure of the experiment was involved following steps;

• The sample C was provided me to perform the hardness test; the first job was to clean the surface of the sample by sand paper.


• After cleaning the surface of specimen the, the sample was placed upon the table.


• The load could be varied and selected from the screen on the vicker hardness tester.


• The specimen was then brought near to the diamond indenter.


• The microscope was turned out of the position while the indentation is being made.


• The load was then applied on the specimen.


• After producing indent the microscope was focused on the indent to study the indent.


• Proper magnification is important for accurate measurements.

Calculations:

Indenter used = Highly polished pointed square base pyramidal diamond with face angles of 136.

Load applied = 9.807N

Lens used = 4x

Time = 10 sec

L-1 (Horizental Diagonal) = 104.28µm

L-2 (Vertical Diagonal) = 96.90µm

HV = 183

HRC= 6.7