High temperature corrosion-fatigue behavior of a shot peened nickel based superalloy

Li, Yong; Cockings, Hollie; Whittaker, Mark; Cockings, B.J.; Buckingham, R. C.; Bache, M.R.

doi:10.1016/j.corsci.2022.110577

Cited by 9 publications

(1 citation statement)

References 30 publications

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“…Nevertheless, Perez et al [3] reported a very long transient period for the single crystal AM1 superalloy, associated with a high oxidation rate before the formation of a low growing rate of protective alumina scale. Conversely, corrosion accelerated by deposits, once initiated, can propagate rapidly and contribute to the degradation of the alloy's mechanical properties even at low temperatures [8,9]. The onset of hot corrosion [10,11,12] involves acidic or basic fluxing of the protective oxides; i.e.…”

Section: -Introductionmentioning

confidence: 99%

Short Term Oxidation in HT-SEM of the Pt-containing TROPEA Single Crystal Ni-based Superalloy from 680 to 1000°C

Mathieu,

Podor,

Emo

et al. 2024

Preprint

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Short-time oxidation of the Ni-based TROPEA single-crystal superalloy was implemented to determine the nature and quantities of transient oxides in the 680–1000°C temperature range. Experiments were carried out in situ in the SEM with reduced air pressure (150 Pa, \(\:{P}_{{O}_{2}}\) ∼ 31.5 Pa) compared to atmospheric conditions (105 Pa, \(\:{P}_{{O}_{2}}\) ∼ 2.1 104 Pa). TEM characterization after oxidation showed the complexity of the oxidation products developed. Aluminum underwent internal oxidation between 680 and 1000°C. During the limited duration of oxidation, the TROPEA alloy only formed a continuous alumina layer at 1000°C. At 680 and 850°C, the low diffusion rate and small amount of Al in the Ni-based single crystal led to the formation of a significant amount of transient oxides such as (Ni,Co)O, compared to the desired chromia or alumina protective oxides. The lower the temperature, the smaller the size of the internal Al2O3 precipitates and the larger the transient oxide crystals, which would lower the resistance of TROPEA to Type II hot corrosion. In contrast after a transient period shorter than 22 hours, during which multiple transient oxide developed, the oxidation resistance would be ensured at 1000°C by the formation of a continuous Al2O3 scale.

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