Stainless steel has the characteristics of high temperature resistance, corrosion resistance, oxidation resistance and good welding performance. This work was studied the static ablation experiment of a new type of beam-coupled nanosecond laser to explore the changes of the main parameters of the laser, such as frequency and power, on the ablation aperture, hole depth, ablation area roughness and ablation morphology of stainless steel. The low-frequency 1 kHz and highfrequency 10 kHz were used to irradiate stainless steel to conduct a comparative analysis of the same frequency and different single pulse energy, and a comparative analysis of the same power and different frequencies. The influence of laser energy density and repetition frequency on the morphology of the processed microstructures was investigated. The ablation morphology of stainless steel becomes more severe with the increase of single pulse energy, and the ablation pore depth and pore size increase with the increase of single pulse energy.
The laser polishing process of metal materials has been extensively studied. This paper proposes a new type of beam-coupled laser polishing method to study the surface quality of polished stainless steel when the power and frequency change, and the changes of the surface roughness and topography with the laser power and frequency were analyzed. Under the condition of power 0.5W and frequency 10Khz, as the feed speed changes from 200mm/min to 1200mm/min, the surface roughness first decreases, then slightly increases. The single pulse energy decreases, and the surface roughness first increases and then decreases with increasing of the frequency from 10kHz to 20kHz. With low repetition frequency and single pulse energy, the surface roughness is significantly reduced to 0.19μm at the process parameters of 2.0W, 10Khz, and 600mm/min. Under the specific process parameters, the processed surface has a color change similar to that caused by surface quenching treatment. The surface material absorbs more laser light, and the processed surface microstructure changes. By adjusting the process parameters, the polishing quality can be improved. It is proved that the beam-coupled laser polishing of stainless steel is an effective polishing method.
Due to excellent properties such as high hardness, high temperature resistance, corrosion resistance and low thermal conductivity, siliconnitrideceramicsare widely used in aerospace, moldand semiconductor fields. This paper studied the material removal characteristics of fixedpoint laser ablation and microgrooving of silicon nitride ceramics in the cross-coupling energy domain after laser beam splitting and combining. When using nanosecond laser for fixed point ablation, the effect of defocus on the surface characteristics of laser ablation was analyzed. When processing surface microgrooves in different directions, the influence of the directional effect of the spatial characteristics of the coupled energy domain on the processing quality was studied. By test and analysis of the surface morphology characteristics of silicon nitride ceramics, the results show thatthe change of the defocus affects the processing depthwhen a fixed point is ablatedin the cross-coupling energy domain. Thedirection effect of microgroove processing has a more significant effect on the surface characteristics.
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