| 摘要 |
This invention relates to a method and apparatus for surface hardening metals over selected areas on a workpiece by means of a concentrated beam of electrons. The electron beam is directed and focused to the surface of the workpiece and is caused to move continuously along a predetermined path over a localized area on the surface. The path is traversed a preset number of times while the instantaneous speed of the beam along the path is varied and the electron beam current is varied in order to bring the selected area of the workpiece above the transformation temperature and close to the melting temperature and maintain it at this temperature for a predetermined time. The beam current is then discontinued to allow the material to be quenched and surface hardened locally. |
