A modified scratch test for the mechanical characterization of scratch resistance and adhesion of thin hard coatings on soft substrates

► The indenter radius of the scratch test was increased. ► Bearing balls were used as indenters in a modified scratch test. ► Soft ASA polymer substrates with hard TiN and CrN coatings were tested. ► Significance, repeatability and failure modes of the test method are illustrated. ► Wear of the steel indenters was evaluated.