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研究了激光诱导放电(LGD)材料表面离散处理的机理和加工方法。在机理研究中发现激光诱导在大尺度上(放电点间隔)和小尺度上(放电点内部)都抑制了放电的随机性,实现了放电点位置的设定,增加了强化深度,提高了放电点的一致性。在LGD表面毛化研究中,发现随着峰值电流的升高,毛化坑凸起高度和毛化表面粗糙度(SRa)随之增大,毛化坑凸起的硬度达到1000 HV。在LGD表面强化研究中,发现通过控制放电电流和脉冲宽度能够获得不同径深比的强化点横截面形貌。在长脉冲宽度下强化点的径深比相似,高电流下的强化点直径更大,强化层更深,低电流则相反。在短脉冲宽度下强化点的深度相似,而高电流的径深比更大,低电流则相反。
The mechanism and processing method of discrete surface treatment on laser induced discharge (LGD) were studied. In the mechanism study, it was found that laser induced randomness was restrained at large scale (discharge point interval) and small scale (inside discharge point), the setting of discharge point position was achieved, the depth of enhancement was enhanced and the discharge Point of consistency. In the study of LGD surface texturing, it was found that with the increase of peak current, the height of raised pits and the roughness of the textured surface (SRa) increased, and the hardness of the raised pits reached 1000 HV. In the study of LGD surface enhancement, we found that the cross-sectional morphology of the enhancement points with different aspect ratios can be obtained by controlling the discharge current and pulse width. At long pulse widths, the depth-to-depth ratio of the intensified dots is similar, with larger intensities at higher currents, deeper layers, and lower currents at the opposite ends. The intensities of the intensified spots are similar at short pulse widths, while the high current has a larger depth-to-depth ratio and a lower current at the opposite end.