Work

Divergent grain boundary oxidation mechanisms in Inconel 718 with pre-tensile and pre-compressive strain state by bending

Year: 2026

Type: article

Abstract: Thermo-mechanical coupling during service induces distinct oxidation behavior in Inconel 718 superalloys. This study systematically examines the oxidation response under pre-tension and pre-compression strains, focusing on microstructural evolution and stress-type-dependent mechanisms. Results reveal that tensile strain suppresses oxidation via accelerated Cr outward diffusion forming protective Cr₂O₃, which reduces oxidation rate. While compressive strain promotes oxidation through void-enhanced oxygen penetration. These findings provide critical insights for designing oxidation-resistant superalloys under coupled stress environments.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2026.01.105