Combined effects of stress and temperature on hydrogen diffusion in non-hydride forming alloys applied in gas turbines

Hydrogen plays a vital role in the utilisation of renewable energy, but ingress and diffusion hydrogen gas turbine can induce embrittlement on its metallic components. This paper aims to investigate transport non-hydride forming alloy such as Alloy 690 used turbines inspired by service conditions blades, i.e. under combined effects stress temperature. An appropriate equation is formulated, accounting for both temperature distributions domain alloy. Finite element (FE) analyses are performed predict steady-state distribution lattice sites dislocation traps double notched specimen constant tensile load various fields. Results demonstrate that concentration very sensitive gradients, whilst only slightly increases local concentration. The result highest trapped low-temperature regions, although plastic strain at moderate level. Our results suggest gradients concentrations blades due cooling channels holes make relatively regions susceptible embrittlement.