Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Snecma Moteurs

Pascal Aubry

Fernando Lomello

Hicham Maskrot

Pierre-François Giroux

Aziz Chniouel

Hervé Launais

Marine Chaussiniac

Thierry Dubois

Olivier Hercher

Sophie Hertmanowski

Jérôme Pradel

Part comprising a steel material whose constituent grains comprise a matrix in which precipitates are incorporated, the precipitates comprising at least one metallic element selected from a metallic element M, a metallic element M′, a metallic element M″ or mixtures thereof; the microstructure of the steel being such that the grains are equiaxed and the average grain size being such that the average of their largest dimension “D max” and/or the average of their smallest dimension “D min” is comprised between 10 μm and 50 μm. The steel material has optimised, stable and isotropic mechanical properties, in particular so that the steel material can best withstand mechanical and/or thermal stresses.

Part comprising an optimized steel material and its manufacturing process

Process for the manufacture of a steel material, wherein the grains of which it is composed comprise a matrix into which precipitates are incorporated, the precipitates comprising at least one metallic element selected from a metallic element M, a metallic element M′, a metallic element M″ or mixtures thereof; the microstructure of the steel being such that the grains are equiaxial and the average size of the grains being such that the average of their largest dimension “Dmax” and/or the average of their smallest dimension “Dmin” is in the range 10 μm to 50 μm. The steel material has optimised, stable and isotropic mechanical properties, in particular so that the steel material is more resistant to mechanical and/or thermal stresses.

Process for the manufacture of an optimised steel material

Steel material whose constituent grains comprise a matrix in which precipitates are incorporated, the precipitates comprising at least one metallic element selected from a metallic element M, a metallic element M', a metallic element M&#x2033; or mixtures thereof; the microstructure of the steel being such that the grains are equiaxed and the average grain size being such that the average of their largest dimension 'Dmax' and/or the average of their smallest dimension 'Dmin' is comprised between 10 &#x3bc;m and 50 &#x3bc;m. The steel material has optimized, stable and isotropic mechanical properties, in particular so that the steel material can best withstand mechanical and/or thermal stresses.

Optimized steel material

The invention provides a welding device () using a power laser beam (), the device () being miniaturized, the device () being suitable for being moved very close to the surface () of the part () to be welded and of reaching welding zones that are difficult to access, but without vapor and particles of molten metal () being capable of penetrating into the inside and dirtying the optical components (). Such a device is remarkable in that it includes a feed () of gas under pressure suitable for producing a primary flow of gas () leaving via the front opening () together with the laser beam (), and in that it also includes a nozzle () connectable to a source of gas under pressure, said nozzle () producing a secondary flow of gas () sweeping the front opening () transversely, thereby deflecting the primary flow of gas () laterally.

Welding unit with miniaturized laser beam

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Paris, France

Pascal Aubry