Changes in surface characteristics of stainless steel polished by nanosecond laser based on beam coupling

Xiaoxiao Chen, Yuan Li, Huihui Zhang, Wenwu Zhang
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引用次数: 1

Abstract

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.
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基于光束耦合的纳秒激光抛光不锈钢表面特性的变化
金属材料的激光抛光工艺得到了广泛的研究。本文提出了一种新型光束耦合激光抛光方法,研究了功率和频率变化时抛光不锈钢的表面质量,并分析了表面粗糙度和形貌随激光功率和频率的变化。在功率0.5W、频率10Khz的条件下,随着进给速度从200mm/min到1200mm/min的变化,表面粗糙度先减小后略有增大。从10kHz到20kHz,随着频率的增加,单脉冲能量减小,表面粗糙度先增大后减小。在低重复频率和单脉冲能量下,在2.0W、10Khz和600mm/min的工艺参数下,表面粗糙度显著降低至0.19μm。在特定的工艺参数下,被加工表面具有类似于表面淬火处理引起的颜色变化。表面材料吸收更多的激光,加工后的表面微观结构发生变化。通过调整工艺参数,可以提高抛光质量。实验证明,光束耦合激光抛光是一种有效的不锈钢抛光方法。
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