Abstract
Single pulse drilling of micro holes (diameter 100 µm, depth<2 mm) in stainless steel (X5CrNi18-10) and nickel-base superalloy (CMSX-4) is performed by pulsed Nd:YAG laser radiation (pulse duration 100-500 µs). The movement of the melting front is investigated by metallography and optical microscopy. The formation of the hole geometry is compared to the spatial and temporal distribution of the pulse power. The processing limits regarding the aspect ratio (diameter: depth) are extended and the quality of drilled holes regarding recast layers in drilled holes, cylindricity, and defined conicity is extended.Single pulse drilling of micro holes (diameter 100 µm, depth<2 mm) in stainless steel (X5CrNi18-10) and nickel-base superalloy (CMSX-4) is performed by pulsed Nd:YAG laser radiation (pulse duration 100-500 µs). The movement of the melting front is investigated by metallography and optical microscopy. The formation of the hole geometry is compared to the spatial and temporal distribution of the pulse power. The processing limits regarding the aspect ratio (diameter: depth) are extended and the quality of drilled holes regarding recast layers in drilled holes, cylindricity, and defined conicity is extended.
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