抄録
This study deals with quenching and tempering using a YAG laser with a machining center. First, the occurrence of partial hardness decrease was confirmed after overlap laser quenching. Second, it could be seen that the oxide film on workpiece surface effected on the laser absorption in tempering. As a result, it is clear that laser tempering considering laser absorption variation also makes it possible to be constant hardness after overlap laser quenching.
