US 11,254,040 B2Granted

Surfacing process, surfaced or resurfaced metal part

AssigneesCompagnie General Des Etablissisiements Michelin Clermont-Ferrand, France, Association Pour La Recherche Developpement Des Methodes Et Processus Industriels (Armines), Ecole Nationale D'Ingenieurs De Saint Etienne Saint Etienne, France, Dma Laser

InventorsBernard Cappa, Cédric Carlavan, Christophe Colin, Maryane Jacquier, Julien Sijobert, Ludovic Thivillon

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Abstract

A subject of the invention is a process for surfacing or resurfacing a metal part by laser-assisted deposition of a filler material in order to produce an abradable coating of the part, the process being characterized in that the filler material is an iron-based powder comprising vanadium, chromium, nickel, boron, silicon and carbon, in that the laser has an operational wavelength ranging from 900 nm to 1100 nm and in that it comprises the irradiation of the part by a laser beam such that the specific energy (SE) varies from 5 J/mg to 10 J/mg and such that the linear density (LD) varies from 25 mg/mm to 55 mg/mm. Another subject of the invention is the surfaced or resurfaced metal part. Another subject of the invention is a pre-alloy in iron-based powder form, comprising vanadium, chromium, nickel, boron, silicon and carbon.

Claims20

Dependent claims

A process for surfacing or resurfacing a metal part by laser-assisted deposition of a filler material on a substrate, the substrate comprising more than 50% by weight of iron relative to the total weight of the substrate, wherein the filler material is a powder consisting essentially of C, Si, B, Ni, Cr, V, and Fe, wherein:

the C is present in an amount of 0.3-2.5% by weight relative to the total weight of the powder,
the Si is present in an amount of 1.5-3.0% by weight relative to the total weight of the powder,
the B is present in an amount of 0.1-3.5% by weight relative to the total weight of the powder,
the Ni is present in an amount of 3.5-5.5% by weight relative to the total weight of the powder,
the Cr is present in an amount of 5-17% by weight relative to the total weight of the powder,
the V is present in an amount of 10-17.5% by weight relative to the total weight of the powder, and
the Fe is present in an amount greater than 50% by weight relative to the total weight of the powder,
the laser-assisted deposition includes forming a coating of the filler material on the substrate,
the coating including more than 50% by volume of a matrix, the matrix comprising more than 50% by weight of iron relative to the total weight of the matrix,
the coating including less than 50% by volume of refractory and hard phases,
wherein a heat-affected zone (HAZ) is formed in the substrate, at an interface between the substrate and the coating, with a thickness of less than 2 mm, and
wherein the laser has an operational wavelength ranging from 900 nm to 1100 nm and wherein the process comprises irradiation of the part by a laser beam such that the specific energy (SE), the ratio of the laser power to the mass flow rate of powder, varies from 5 J/mg to 10 J/mg and such that the linear density (LD), the ratio of the mass flow rate of powder to the laser scanning speed, varies from 25 mg/mm to 55 mg/mm.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/766,823Filed 6 Oct 2016
Priority: FR 15595878 Oct 2015
Published: US 2018/0297260 A118 Oct 2018
Granted: 22 Feb 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

B29C 48/509
Characterised by the material or their manufacturing process: materials, coating or lining therefor
B23K 26/34
Working by laser beam, e.g. welding, cutting or boring: laser welding for purposes other than joining
B23K 35/3086
With Cr as next major constituent: containing Ni or Mn
B23K 35/3093
Fe as the principal constituent: with other elements as next major constituents