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Surface remelting process, especially for electron beam surface hardening of cast iron camshaft cam surfaces, avoids secondary graphite precipitation caused by melt track cooling to the critical temperature and subsequent reheating
Surface remelting process, especially for electron beam surface hardening of cast iron camshaft cam surfaces, avoids secondary graphite precipitation caused by melt track cooling to the critical temperature and subsequent reheating
A charge carrier beam surface remelting process, which avoids secondary graphite precipitation caused by melt track cooling to the critical temperature and subsequent reheating, is new. A charge carrier beam surface remelting process, for workpiece case hardening, comprises high frequency two-dimensional deflection of the beam, especially an electron beam, to produce adjacent melt tracks on the surface, the path of the tracks being adapted to the geometry of the surface region to be hardened. The novelty is that (a) all the tracks are produced quasi-simultaneously over the region of the surface to be hardened; or (b) one or more tracks are produced in several passes, the velocity of relative motion between the beam and the workpiece being chosen such that a track produced in a preceding pass is not so intensely cooled that the critical temperature is reached and that it is reheated during production of the next track in the following pass.
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