Year: 2025
Type: article
Abstract: The corrosion behaviour of a nickel-based superalloy K452 in a simulated gas turbine blade service environment (Air+2 vol.% SO 2 ) at 900 °C up to 2000 h was investigated by both microstructural characterization and the Molecular Dynamics (MD) calculations. The mass gain of K452 alloy is increased from 4.12 mg/cm² to 6.64 mg/cm² by the induce of SO 2 . The formation of numerous voids and pits in the corrosion layer is caused by the presence of SO 2 . After long-term corrosion, an outer layer with Ni enriches form since the outward diffusion of Ni from the substrate to the outer corrosion layer is promoted by the enhanced chemical potential gradient. The repeated oxidation and sulphidation of Ni-rich sulphides in the outer layer is the main reason for long-term corrosion degradation of the alloy.
Source: npj Materials Degradation
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,590
Funder: Chinese Academy of Sciences
OpenAlex ID: W4409616634