Corrosion Failures in Gas Turbine Hot Components

Experimental investigation and life prediction of hot corrosion pre‐exposure on low‐cycle fatigue of a directionally solidified nickel‐base superalloy

“…When turbine blades in aircraft and power engines operate in a marine environment, the salt from sea water and the saline atmosphere, in combination with sulphur, vanadium and other alkali metals present in the fuel, melts in the prevailing temperature and induces hot corrosion . It can cause a significant reduction in the fatigue life of corrosion damaged components, which will result in increase of cost and inconvenience of damage repair . Therefore, the simultaneous performance of superalloys in corrosive environments and under a fatigue load has recently become a popular research topic.…”

“…1 It can cause a significant reduction in the fatigue life of corrosion damaged components, which will result in increase of cost and inconvenience of damage repair. [2][3][4][5][6] Therefore, the simultaneous performance of superalloys in corrosive environments and under a fatigue load has recently become a popular research topic. creep, fatigue and particularly creep-fatigue interaction.…”

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

“…Ni-based superalloy has excellent creep resistance, high rupture strength, and corrosion resistance, so it is a perfect material for key components of aeroengines (He et al, 2015;Sun et al, 2015). They must be subjected to high temperature oxidation and hot corrosion by O 2 or other corrosive substances, for example, sulfur (Kosieniak et al, 2012;Yang et al, 2020). In heavy air pollution or coastal working environment, the metallic sulfates, such as Na 2 SO 4 , will be deposited on the surface of key components and accelerate their degradation (Eliaz et al, 2002;Wang et al, 2011).…”

High-temperature hot-corrosion effects on the creep–fatigue behavior of a directionally solidified nickel-based superalloy: Mechanism and lifetime prediction

“…These hot-corrosion attacks are mainly induced by the ingested salt deposits, for example Na 2 SO 4 , NaCl, and V 2 O 5 , which are sometimes deposited on the surface of the turbine blades (Lortrakul et al, 2014;McCreath, 1983;Miller, 1972). Hot corrosion accelerates the surface deterioration of materials and stimulates the nucleation and propagation of cracks, resulting in an earlier failure than the expected design life of engineering structures (Eliaz et al, 2002;Kosieniak et al, 2012;Poursaeidi et al, 2008;Viswanathan, 2001). Thus, component failure resulting from the combined effects of mechanical and hot corrosion becomes a crucial problem.…”