Microstructure and corrosion of two experimental Ni-Cr-Fe superlloys

Jaime Llaneza; Maria Angeles Arenas; Juan Jose de Damborenea; Francisco Iglesias; Manuel Carsí

doi:10.3989/revmetalm.e273.1607

Authors

Jaime Llaneza University of Jaén, Linares Campus, Materials Science Department https://orcid.org/0000-0002-8940-9739
Maria Angeles Arenas CENIM-CSIC https://orcid.org/0000-0002-7807-8209
Juan Jose de Damborenea CENIM-CSIC https://orcid.org/0000-0002-8053-594X
Francisco Iglesias University of Jaén, Linares Campus, Materials Science Department https://orcid.org/0000-0002-2917-3541
Manuel Carsí CENIM-CSIC https://orcid.org/0000-0001-8068-5385

DOI:

https://doi.org/10.3989/revmetalm.e273.1607

Keywords:

Corrosion, Microstructure, Superalloys, Incoloy

Abstract

Two modified variants of Fe-based and Ni-based superalloys were investigated, derived from commercial alloys similar to Incoloy 800H and Incoloy 825, respectively. Both superalloys have a microstructure of equiaxial grains of approximately 300 µm after undergoing a thermomechanical treatment, consisting of heating to a temperature of 1200 °C for 45 minutes followed by quenching. Carbide, carbonitride, and titanium nitride particles were identified in the microstructure. Creep analyses were carried out, concluding that the Ni-based superalloy has a better performance than the Fe-based one. Lastly, polarization curves were performed to determine their corrosion resistance. It was found that both alloys exhibit very high pitting potential, suggesting a low likelihood of localized attack. This highlights their outstanding corrosion resistance in saline environments compared to the commercial reference alloys.

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