Precautions
When doing the hardness tests the minimum distance between indentations and the distance from the indentation to the edge of the specimen must be taken into account to avoid interaction between the work-hardened regions and effects of the edge. This minimum distances are different for ISO 6507-1 and ASTM E384 standards.
| Standard | Distance between indentations | Distance from the center of the indentation to the edge of the specimen |
|---|---|---|
| ISO 6507-1 | > 3·d for steel and copper alloys and > 6·d for light metals | 2.5·d for steel and copper alloys and > 3·d for light metals |
| ASTM E384 | 2.5·d | 2.5·d |
Read more about this topic: Vickers Hardness Test
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