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The present publication presents an analysis of the impact of surface stereometry and the absorption coating on the efficiency of ablative laser texturing of 100CrMnSi6-4 bearing steel. Using different variants of surface development and an absorbent resulted, under the same process conditions, in micro-trays differing from each other in geometrical structure (diameter, depth). In the experimental studies, a pulsed Yb:YAG laser with λ = 1.07 µm and a maximum power of 30 W was used. The diameter of the laser beam ranged between 15 and 60 µm, the repetition frequency was 20 kHz and the laser radiation exposure time ranged between 0.5 and 100ns. In the zone adjacent to the trays, fine crystalline martensitic, martensitic-bainitic and bainitic microstructures were found. These microstructures formed as a result of ultrafast phase transformations occurring, among others, during the crystallization of the alloy Fe-C-Cr-Mn-Si liquid phase and the very fast heating and cooling of the surface layer of steel in the solid state. Use of the absorption coating and developing the exposed steel surfaces improve the absorptivity of the laser radiation. With the increase of surface roughness, the efficiency of the laser texturing process was also increased. The results from these tests are promising and may be used, among others, in the production processes of roller bearings, such as in the ablative surface texturing of treadmill roller bearings.

The impact of the output stereometry and absorbent coating on the efficiency of ablative laser texturing of iron alloy 100CrMnSi6-4