Sublayer for a nickel-based superalloy for enhancing the lifetime of the parts and implementation method thereof

A nickel-based superalloy part comprising:

• a nickel-based superalloy substrate;
• and
• a metal sublayer covering the substrate,
• wherein the metal sublayer comprises a first and a second layer, said first layer being located between the substrate and the second layer, said first layer comprising a first γ′-Ni3Al phase and a second γ-Ni phase, said second layer comprising a first γ′-Ni3Al phase, a second γ-Ni phase and a third β-NiAl phase, the an average atomic content of aluminum in the second layer being strictly greater than the average atomic content of aluminum in the first layer, and in which the a total content of γ-Ni in the metal sublayer is comprised between 5.0% and 20.0% by mass, the a total content of γ′-Ni3Al in the metal sublayer is comprised between 40.0% and 90.0% by mass and the a total content of β-NiAl in the metal sublayer is comprised between 5.0% and 40.0% by mass relative to the total weight of the sublayer,
• wherein the first layer comprises a plurality of first areas, each of the first areas of the first layer comprising an average content of aluminum up to 4% greater than an average atomic content of aluminum of an area directly below, said first areas having a thickness of 1 μm to 5 μm, and
• wherein the second layer comprises a plurality of second areas having an average atomic content of aluminum up to 4% greater than an average atomic content of aluminum of an area directly below, said second areas having a thickness of 1 μm to 5 μm.