What should you do if you notice a large disparity in the Vi

What should you do if you notice a large disparity in the Vickers diagonals of a single indent on a sample that exhibits uniform mechanical properties?

Solution

The Vickers test designed as a replacement for theBrinnel ball indenter test.

Occasionally the size of the diagonals of the impression dont match. The resaon is becasue of one or two factors:

ANISOTROPY of material

Incorrect application of the Load indenter

Hardness Vickers = 1854 (L/d²)

Load is low.

Can do the test again properly.

If result persists as before, chamge over to KNOOP test which relies on only one diagonal

HK = 14229L/d²

BEST