“…Hardness can be defined as the resistance to permanent plastic deformation, scratch or indentation of a softer material by a harder one. It is measured several times in the production line in order to assure the quality of several items produced, to perform sampling during the production processes and in materials receipt tests (Oliveira, S.P., 2011). Brinell, Vickers and Rockwell are the most used indentation hardness scales for metallic materials.…”