Surface treatment of austenitic ni-fe-cr based alloys

C - Chemistry – Metallurgy – 22 – F

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C22F 1/10 (2006.01) C21D 7/04 (2006.01) C21D 7/06 (2006.01) C21D 9/50 (2006.01) C21D 10/00 (2006.01)

Patent

CA 2466829

A surface treatment process for enhancing the resistance to intergranular corrosion and intergranular cracking of components fabricated from austenitic Ni-Fe-Cr based alloys comprising the application of surface deformation to the component, to a depth in the range of 0.01 mm to 0.5 mm, for example by high intensity shot peening below the recrystallization temperature, followed by recrystallization heat treatment, preferably at solutionizing temperatures. The surface deformation and annealing process can be repeated to further optimize the microstructure of the near-surface region. Following the final heat treatment, the process optionally comprises the application of further surface deformation (work) of reduced intensity, yielding a worked depth of between 0.005 mm to 0.01 mm, to impart residual compression in the near surface region to further enhance cracking resistance.

L'invention concerne un procédé de traitement de surface permettant d'améliorer la résistance à la corrosion intragranulaire et à la fissuration intragranulaire des composants fabriqués à partir d'alliages à base de Ni-Fe-Cr austénitiques. Ce procédé consiste à déformer la surface d'un composant dans une profondeur variant de 0,01 mm à 0,5 mm, par exemple par grenaillage de précontrainte à intensité élevée en dessous de la température de recristallisation, suivi d'un traitement thermique de recristallisation, de préférence à des températures de solution. La déformation de surface et le processus de recuit peuvent être répétés afin d'optimiser la microstructure de la zone à proximité de la surface. Suite au traitement thermique final, ce processus peut éventuellement consister à effectuer une autre déformation (travail) de surface à intensité réduite, à obtenir une profondeur travaillée comprise entre 0,005 mm et 0.01 mm afin de comprimer résiduellement la zone à proximité de la surface afin d'améliorer la résistance à la fissuration.

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