Manufacturing metal part such as blade of turboshaft engine, comprises performing two successive sweepings of same zone of metal powder layer by laser beam or electron beam, where metal powder layer is coated with deposit on support

摘要

The method comprises performing two successive sweepings of a same zone of a metal powder layer (2) by a laser beam or an electron beam (11) of different energies, where the metal powder layer is coated with a deposit on a support (6), a selective fusion is performed in the metal powder layer by sweeping a surface of the metal powder layer by the laser beam or the electron beam, and a coating part is obtained after solidification of the metal powder layer. A periphery of the part is swept by the laser beam or electron beam whose energy is lower than that used to sweep the core of the part. The method comprises performing two successive sweepings of a same zone of a metal powder layer (2) by a laser beam or an electron beam (11) of different energies, where the metal powder layer is coated with a deposit on a support (6), a selective fusion is performed in the metal powder layer by sweeping a surface of the metal powder layer by the laser beam or the electron beam, and a coating part is obtained after solidification of the metal powder layer. The first sweeping is carried out with a laser beam or an electron beam whose energy is lower or higher than that of the laser beam or the electron beam during the second sweeping. A periphery of the part is swept by the laser beam or electron beam whose energy is lower than that used to sweep the core of the part. The first complete sweeping of the metal powder layer is carried out using the laser beam or the electron beam before carrying out the second complete sweeping of the zone previously swept using the laser beam or the electron beam. The sweeping of the metal powder layer is carried out using first and second beams that are simultaneously moved and shifted one compared to the other so that a trajectory of the second beam follows that of the first beam. The first and second beams are produced by a same source whose beam was divided into two parts or produced by two distinct sources (9). The metal powder layer comprises superalloy of nickel. An average granulometry of the metal powder layer is 40-45 mu m. The first sweeping of the metal powder layer is realized using the laser beam with an energy of 0.22-0.26 Watt.s/mm. The second sweeping is realized using the laser beam with an energy of 0.11-0.13 Watt.s/mm. The periphery of the part is swept by a first laser beam whose energy is 0.14-0.18 Watt.s/mm, and by a second laser beam whose energy is 0.09-0.11 20 Watt.s/m.