Fabrication of interference textures on cemented carbides using nanosecond and femtosecond laser pulses
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Laser surface texturing is becoming popular in recent years, as its application in variant fields can bring in many benefits, such as to improve tribological performances of contact surfaces. As frontline engineering materials, cemented carbides are widely used in mining and manufacturing. Using as cutting tool materials, it is then interesting to texture the working surfaces of cemented carbides. In this work, a cemented tungsten carbide grade is selected as target material. Line-like structures are produced on the surfaces of the cemented carbide grade by the method of direct laser interference patterning (DLIP) using nanosecond and femtosecond laser pulses, respectively. Specific laser setup is individually configured to obtain topographic features on the scale of micrometer. It is aimed to testify the production precision using such configuration and compare the ablation effects using the two typical laser set-ups. Topographic features of the produced patterns are characterized using confocal laser scanning microscopy. Morphological features and surface integrity are inspected by scanning electron microscopy also using a focused ion beam. It is found that both nano- and femtosecond lasers achieved satisfactory geometrical precision, which comply with the theoretical calculation. The surface formed by the femtosecond laser is cleaner and shows smoother patterns exhibiting lower melting or microcrack formation.
CitationLlanes, L. Fabrication of interference textures on cemented carbides using nanosecond and femtosecond laser pulses. "Procedia CIRP", 2020, vol. 87, p. 216-221.