Changing the high strength steel surface properties with femtosecond laser beam

Berczeli, Miklós and Tajti, Ferenc and Juhász, Gergely and Weltsch, Zoltán (2024) Changing the high strength steel surface properties with femtosecond laser beam. OPTICS AND LASER TECHNOLOGY, 174. No.-110556. ISSN 0030-3992

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Abstract

Today, the automotive industry is undergoing rapid change. While manufacturers are constantly switching to fully or semi-electric hybrid models, the weight of the vehicles also increases significantly due to the extra weight of the batteries. Since the weight of vehicles has the most significant influence on their consumption and, with it, harmful emissions (even indirectly far from the place of use), manufacturers strive to keep weight under control with continuous improvements. One of the main directions of the developments is the use of new light but at the same time heavy-duty materials with a wide variety of material combinations. These new material pairings pose challenges to knitting technology solutions, which need to be developed similarly. In the course of our research, we are investigating how the surface properties can be optimized in the case of steel with increased strength for the automotive industry, without additional added material and changes visible to the naked eye. We subject the examined DP600 material to a short-pulse laser beam treatment, and we manage to change the surface structure so that the interface properties measured by wetting are significantly improved. The results are confirmed by electron microscopic examinations.

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