Prediction of Initial Oxidation Behavior of Ni‐Base Single Crystal Superalloys: A New Oxidation Map and Regression Analysis

Suzuki, Aya; Kawagishi, Kyoko; Yokokawa, Toshio; Kobayashi, Toshiharu; Harada, Hiroshi

doi:10.1002/9781118516430.ch35

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…As a result, the most stable sulphide compound, TiS, formed in the substrate [20]. TiS formation continues with the continuation of sulphur transfer from NiO and Cr 2 O 3 layers to the substrate surface downwardly until the conditions for CrS phase formation was provided [39,45]. The presence of longitudinal cracks in the upper regions of the oxide scale of the S60 specimen (Figure 2(a)) indicated internal sulfidation in the substrate [46].…”

Section: Resultsmentioning

confidence: 99%

The evaluation of oxide scale formation during hot corrosion of Rene-80 superalloy under thermal shock at different dwell times

Rabieifar

Afshar

Najafi

et al. 2021

Corrosion Engineering, Science and Technology

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In this study, the oxide scale formation on the Rene-80 superalloy after hot corrosion under thermal shock has been investigated. The X-ray diffraction (XRD) and field-emission scanning electron microscope (FE-SEM) were used for the phase identification and evaluation of oxide scale, respectively. The hot corrosion test under thermal shock was performed by depositing Na 2 SO 4 salt at the beginning of each cycle on the surface of the specimens. The results showed that hot corrosion occurred intermittently with the basic fluxing mechanism of the oxide scale and reprecipitation of discontinuous and porous oxides. The growth rate of the Cr 2 O 3 layer increased with decreasing the dwell time per cycle and the dissolution of titanium. Decreasing the dwell time in each hot corrosion cycle increased the growth rate of the Cr 2 O 3 layer, the chromium depletion from the substrate/oxide scale interface, the internal oxidation of aluminium, and the internal sulfidation of chromium.

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Section: Resultsmentioning

confidence: 99%

The evaluation of oxide scale formation during hot corrosion of Rene-80 superalloy under thermal shock at different dwell times

Rabieifar

Afshar

Najafi

et al. 2021

Corrosion Engineering, Science and Technology

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Advanced Alloy Design Program and Improvement of Sixth-Generation Ni-Base Single Crystal Superalloy TMS-238

Yokokawa¹,

Harada²,

Kawagishi³

et al. 2020

The Minerals, Metals &Amp; Materials Series

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Effect of Solution Heat-Treatment on the Oxidation Resistance of Ni-Base Single-Crystal Superalloy

Tabata,

Osada,

Yokokawa

et al. 2023

Metall Mater Trans A

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To clarify the effect of solution heat-treatment on the oxidation resistance of Ni-base single-crystal superalloy TMS-238, the evaluation of dendrite/inter-dendrite segregation of alloying elements in the as-cast and heat-treated samples, and its effect on cyclic oxidation resistance were investigated. Cyclic oxidation test results at 1100 °C for up to 150 cycles clearly showed that the as-cast samples with element segregations had lower oxidation resistance compared to heat-treated samples with homogeneous structure. Further, for the as-cast sample, rapid growth and spallation of oxide consisting of NiO, Cr2O3, and Al2O3 were observed around the dendrite core for 10 cycles of oxidation. Analysis of sub-surface on sample isothermally oxidized at 1100 °C for 10 minutes showed that rapid oxide growth is due to the formation of discontinuous Al2O3 layer at dendrite core with lower Al concentration. Furthermore, in this study, the threshold value of Al concentration and Gibbs energy for the formation of continuous Al2O3 layer were estimated and determined to be around 5.2 wt pct and − 556.6 ± 0.5 kJ/mol, respectively. This indicated that the solution heat-treatment for TMS-238 should be conducted above 1305 °C for exhibiting oxidation resistance at 1100 °C, to meet the threshold value within the whole region between dendrite and inter-dendrite.

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Prediction of Initial Oxidation Behavior of Ni‐Base Single Crystal Superalloys: A New Oxidation Map and Regression Analysis

Cited by 4 publications

References 29 publications

The evaluation of oxide scale formation during hot corrosion of Rene-80 superalloy under thermal shock at different dwell times

The evaluation of oxide scale formation during hot corrosion of Rene-80 superalloy under thermal shock at different dwell times

Advanced Alloy Design Program and Improvement of Sixth-Generation Ni-Base Single Crystal Superalloy TMS-238

Effect of Solution Heat-Treatment on the Oxidation Resistance of Ni-Base Single-Crystal Superalloy

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