Abstract
Laser scanning processing of nickel-based superalloy AM1 surfaces by ultra-short pulses (10 ps) is introduced as a cleaning and deoxidation postprocess. The laser cleaning is investigated with two-directional surface scanning by a laser beam with several frequencies of pulse generation. The EDX elemental analyses of the laser cleaned AM1 surfaces were compared with the non-laser treated surface. The optimal speed, laser pulse repetition frequency, overlapping and layer repetition count are determined for minimal structural changes on the mechanically polished AM1 surfaces. The laser cleaning after shifted laser surface texturing (sLST) is presented as a two-step preparation of a superalloy surface for thermal spraying. The heat accumulation effect and temperature fields are calculated from a semi-planar model of a laser beam scanning heat source. The theoretical results are discussed in comparison with experimental studies. The upper and bottom bounds are defined for an optimal high speed laser cleaning process.
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