Oxidation Kinetics and Oxide Scale Characterization of Nickel-Based Superalloy IN738LC at 900 °C

Mallikarjuna, H.T.; Caley, W. F.; Richards, N.L.

doi:10.1007/s11665-017-2954-6

Cited by 19 publications

(4 citation statements)

References 24 publications

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“…pct is desirable in order to limit the formation of Ti-rich oxides. The literature highlights that while increasing the Ti content can increase the activity of Cr, it increases the chromia scale growth rate by injecting vacancies [31,32] and can diffuse through the chromia scale along grain boundaries. [33] Al, Nb, and Ta contents can be increased in order to achieve the desired levels of c 0 without the inclusion of deleterious amounts of Ti.…”

Section: Implications For Design Of Oxidation Resistant Superalloys F...mentioning

confidence: 99%

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Utada

Pedraza

Dick-Cleland³

et al. 2022

Metall Mater Trans A

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This body of work aims to inform alloy design for additive manufacturing by investigating the early-stage oxidation behavior of Ni-based superalloys processed by laser-powder bed fusion. The oxidation of 14 Ni-based superalloys—some novel and some heritage—at 1000 °C for 24 hours is studied through thermo-gravimetric analysis. The mass gain, oxide layer thickness, oxide scale composition, and $$\gamma ^\prime $$ γ ′ depletion zone size are measured. The influence of the alloy composition on these variables is assessed in order to elucidate how increasingly processable and oxidation resistant alloys can be developed. The alloy compositions with Al content greater than 9 at. pct form continuous Al2O3 scales at 1000 °C and display markedly lower parabolic rate constants, mass gain, oxide layer thickness, and $$\gamma ^\prime $$ γ ′ depletion zone size. The alloys of lesser Al content have reduced oxidation resistance and formed oxide scales of predominantly Cr2O3. Alloys with Ti content of 2.7 at. pct and greater formed Ti-rich oxide phases in their oxide scales as well as TiN subscale. A trade-off between alloy processability and oxidation resistance is identified, dictated by the deleterious effect of Al content on the ductility dip and the benefit of Al for oxidation resistance. A property space along the pareto front is highlighted which is ideal for having oxidation resistance and processability.

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Section: Implications For Design Of Oxidation Resistant Superalloys F...mentioning

confidence: 99%

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Utada

Pedraza

Dick-Cleland³

et al. 2022

Metall Mater Trans A

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“…Senkov et al reported that Ti was enriched in the area below the oxide layer of the NbCrMo 0.5 Ta 0.5 TiZr alloy and had a good antioxidant effect at 1000 • C [28]. When HEAs contained Ti and Cr, Ti was more inclined to act as a catalyst to enhance Cr activity and then accelerate the formation of Cr 2 O 3 [29]. MCrAlY alloys (M is Ni, Co, or both) acted as protective coatings against high-temperature oxidation and corrosion of gas turbine components [30,31].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation Behaviors of AlCrTiSi0.2 High-Entropy Alloy Doped with Rare Earth La and Y

Meng

Fang

et al. 2023

Crystals

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High-entropy alloys (HEAs) were prepared with strong antioxidant metals Al, Cr, Ti, and Si as matrix elements, and the effects of rare earth (RE) lanthanum (La) and yttrium (Y) doping on their microstructures and high-temperature oxidation resistance were explored in this study. The AlCrTiSi0.2RE0.02 HEAs were prepared by using vacuum arc melting and were oxidized mass gain at 1000 °C. After oxidation for 53 h, AlCrTiSi0.2 HEA had a mass increase of 1.195 mg/cm2, and it had the best oxidation resistance of three HEAs (AlCrTiSi0.2, AlCrTiSi0.2La0.02, and AlCrTiSi0.2Y0.02). The surface oxide layers of three HEAs mainly consisted of Al and Ti oxides; the layered oxide film of AlCrTiSi0.2 alloy was mainly composed of dense Al2O3, and the acicular oxide films of AlCrTiSi0.2La0.02 and AlCrTiSi0.2Y0.02 alloys were primarily composed of loose Ti oxide. Doping La and Y decreased the oxidation resistance of AlCrTiSi0.2. In the early stage of oxidation of rare earth HEAs, the surface oxide layer was loose because La and Y reacted with the matrix metal, which slowed down the diffusion of element Al or accelerated the diffusion of element Ti. In the late stage of oxidation, La and Y interacted with O and entered the matrix metal to form rare earth oxides.

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“…IN738LC is a special nickel base superalloy which is extensively used to make hot section components [8][9][10]. It has been reported that IN738LC has a high temperature strength due to multiphase microstructure conferred by the fine particles of Ll 2 type ordered γ′ [Ni3(Al, Ti)] phase which is precipitated coherently in the FCC structured γ matrix [11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and hot corrosion behavior of hot dip siliconized coating on Ni-base superalloy IN738LC

Targhi

Omidvar

Hadavi

et al. 2020

Mater. Res. Express

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Nickel-based superalloys are widely used at elevated temperature applications because of their high corrosion and oxidation resistance characteristics as well as high stability. To improve the hot corrosion resistance of Nickel-based superalloys, different coatings are applied. In this study, nickelbase superalloy Inconel 738LC was coated via a novel hot-dip diffusion siliconizing process and the corrosion behavior was investigated by XRD, SEM and EDS analyses. A sever degradation and poor hot corrosion resistance was detected by the uncoated sample, while the siliconized coated sample possessed high corrosion resistance. It was figured out that the high hot corrosion resistance of the coated sample was due to the formation of SiO 2 protective scale in the surface layer which protects the substrate elements in the hot corrosion environment.

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Oxidation Kinetics and Oxide Scale Characterization of Nickel-Based Superalloy IN738LC at 900 °C

Cited by 19 publications

References 24 publications

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

High-Temperature Oxidation Behaviors of AlCrTiSi0.2 High-Entropy Alloy Doped with Rare Earth La and Y

Microstructure and hot corrosion behavior of hot dip siliconized coating on Ni-base superalloy IN738LC

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