中文摘要：

实验研究了YAG激光诱导放电（LGD）表面离散强化形貌,包括强化点的表面形貌和横截面形貌。利用放电过程中的电弧压力,对强化点表面进行造型。大电流、倾斜放电容易将熔凝物吹起形成凹坑和突起,表面起伏更加明显,而小电流、垂直放电则能得到平坦的表面,有利于增大强化深度。随脉冲宽度的增加,强化点的径深比逐渐变小,在相同强化深度下,小电流、长脉冲宽度可以获得小径深比、厚深状的强化点,而大电流、短脉冲宽度可以获得大径深比、扁平状的强化点。在现有实验条件下,在电流150 A,脉冲宽度9.83 ms下得到最大强化深度为0.479 mm,径深比为3.9。

英文摘要：

The morphology of surface disperse strengthening by laser-guided discharge（LGD） is investigated, including the surface morphology and the cross section morphology of the strengthened area.It is found that the arc pressure can form the special morphology on the surface of the strengthened area in the process of arc discharge.The large current with the tilted discharge is liable to blow the melted metal up and forms the pit and bulge on the surface of the strengthened area,while the small current with the perpendicular discharge structure is liable to form the flat surface of the strengthened area and to increase the thickness of layer strengthened.The ratio of diameter versus thickness of the strengthened area is decreased when the discharge pulse-width is increased.In the same thickness of the strengthened layer,the low current and the long discharge pulse-width is liable to form the small ratio of diameter versus thickness of the strengthened area,while the high current and the short discharge pulse-width is liable to form the big ratio of diameter versus thickness of the strengthened area.Under the present experimental condition,the maximum thickness of the strengthened area is 0.479 mm,and the ratio of diameter versus thickness of the strengthened area is 3.9,when the current is 150 A and discharge pulse-width is 9.83 ms.