| 摘要 |
A method and apparatus for improving the properties of a material of a workpiece by laser shock peening in which an overlay 18 which is opaque to a laser beam, and an overlay which is translucent 20 to said laser beam, are applied to a surface of a workpiece. The translucent overlay being applied on top of and over the opaque overlay. A laser beam is then directed at the said surface to which the overlays have been applied to vaporise the opaque overlay and laser shock peen the surface of the workpiece to produce a region of compressive residual stress in said surface. The overlays and the laser beam being applied concurrently, in a single operation, as the surface of the workpiece is traversed so that as each point on the surface to be treated is traversed the opaque overlay, translucent overlay, and laser shock peening are applied sequentially to that point. The opaque overlay is preferably an ink layer which is applied by printing on the surface. The apparatus, which in particular is arranged for carrying out this method, comprises the means for applying the overlays and for directing the laser beam at the surface all mounted upon a common tool head. |
