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Abstract
We have performed surface modification of selected tool steels. The steels were covered with adhesive coatings of the hard chrome type or with diffusion layers of the nitride type. We have investigated in particular surface roughness, since it is known to affect friction, lubrication and wear. We have also considered an accumulation of strain energy in the strained area, which accompanies the crystal lattice deformation caused by burnishing. Surface roughness was determined by a profilometer before and after burnishing. Adhesion of coatings to steel was determined with a scratch tester. A combination of both approaches, slide burnishing with hard chrome coating and/or slide burnishing with nitriding, seems worthwhile. Both treatments and their combinations can be used in manufacturing tools and structural elements in automotive and aerospace industries.
Acknowledgements
The authors are grateful to the Materials Engineering and Sintering Centre team of IAMT for performing SEM analysis and electron probe X-ray microanalysis as well as for microhardness tests.