Thickness apropos stoichiometry in Pt-aluminide (PtAl) coating: Implications on the tensile properties of a directionally solidified Ni-base superalloy

Parlikar, Chandrakant; Alam, Zafir; Chatterjee, Dibyendu; Das, Dipak K.

doi:10.1016/j.msea.2016.11.074

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…The presence of TiC as internal carbides within the dimples was confirmed by this analysis. The existence of carbide particles inside the dimples is also reported in the other research (Parlikar et al, 2017). No presence of the cracks in the Pt-Al coatings at 982 °C can be coupled to the good ductility over the DBTT.…”

Section: Cyclic Stress-strain Behavior Of Coated Specimenssupporting

confidence: 84%

“…5e, the crack remained in the coating thickness range and no penetration of cracks into the substrate has been observed. Other studies (Parlikar et al, 2017) showed a decrease in the extent of crack penetration with the increase in test temperature. However, it is known that these cracks decrease the load bearing cross-section area of the substrate and cause a decrease in the strength of the substrate alloy.…”

Section: Monotonic Stress-strain Behavior (Tensile Properties)mentioning

confidence: 79%

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Comportamiento a fatiga de baja frecuencia del compuesto Rene®80 recubierto de aluminuro de platino cerca y por encima del DBTT

et al. 2021

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La superaleación Rene®80 a base de Ni se utiliza para fabricar álabes de turbinas de gas en motores a reacción. La vida útil de algunas palas de turbina de motores a reacción está limitada por la fatiga de baja frecuencia y esta propiedad se ha visto fuertemente afectada por los revestimientos. La temperatura de transición de dúctil a frágil (DBTT) es el factor más importante que afecta las propiedades mecánicas de las aleaciones recubiertas. En este estudio, se evaluó el comportamiento de fatiga a alta temperatura y baja frecuencia del compuesto Rene®80 sin recubrimiento y recubierto con aluminuro de platino (Pt-Al) a temperaturas de 871 °C (cerca del DBTT) y 982 °C (por encima del DBTT). Los resultados de las pruebas de fatiga, en condiciones de deformación controlada a 871 °C para R = 0 y una tasa de deformación de 2×10-3 s-1, en un intervalo de deformación total de 0,8%, mostraron una disminución de la resistencia a la fatiga de las muestras recubiertas de aproximadamente un 14%, en comparación con las no recubiertas. Sin embargo, el aumento de la temperatura de prueba de 871 °C a 982 °C, condujo a un aumento en el comportamiento a fatiga de baja frecuencia del compuesto Rene®80 recubierto en aproximadamente un 10% en comparación con las muestras sin recubrir.

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Section: Cyclic Stress-strain Behavior Of Coated Specimenssupporting

confidence: 84%

Section: Monotonic Stress-strain Behavior (Tensile Properties)mentioning

confidence: 79%

Comportamiento a fatiga de baja frecuencia del compuesto Rene®80 recubierto de aluminuro de platino cerca y por encima del DBTT

et al. 2021

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“…Phase stoichiometry plays an effective role on the type of structural defects. Vacancy imperfections are more evident in hyper-stoichiometric coatings, while the substitutional imperfections become visible in hypo-stoichiometric coatings [6,22]. Vacancy defects show higher hardness in comparison with substitution defects [6].…”

Section: Microstructural Characterizationmentioning

confidence: 94%

“…Hence, it can be resulted that in LTHA method, β-(Ni, Pt)Al is hyper-stoichiometric and in HTLA method, this phase is hypo-stoichiometric. The strength of hyper-stoichiometric phases is more than hypostoichiometric [6,21]. Thus, coating which has been formed by LTHA method is stronger than the HTLA coating and higher stresses can be tolerated by it.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

“…Diffusion coatings play a remarkable role in the mechanical behavior of the substrate at the different temperatures. Effect of Pt-Al coating on the tensile properties of a nickel-base, single crystal superalloy was evaluated by Parlikar et al [6]. The results of mentioned work indicated that application of Pt-Al coating on the superalloy led to a decline in the strength properties of the alloy (yield and ultimate tensile strength) at temperatures between ambient and 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

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Creep rupture properties of bare and coated polycrystalline nickel-based superalloy Rene®80

Barjesteh

Abbasi

Zangeneh-Madar

et al. 2021

J min metall B Metall

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Creep deformation is one of the life time limiting reasons for gas turbine parts that are subjected to stresses at elevated temperatures. In this study, creep rupture behavior of uncoated and platinum-aluminide coated Rene?80 has been determined at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 Mpa in air. For this purpose, an initial layer of platinum with a thickness of 6?m was applied on the creep specimens. Subsequently, the aluminizing were formed in the conventional pack cementation method via the Low Temperature-High Activity (LTHA) and High Temperature-Low Activity (HTLA) processes. Results of creep-rupture tests showed a decrease in resistance to creep rupture of coated specimen, compared to the uncoated ones. The reductions in rupture lives in LTHA and HTLA methods at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 MPa were almost (26% and 41.8%), (27.6% and 38.5%) and (22.4% and 40.3%), respectively as compared to the uncoated ones. However, the HTLA aluminizing method showed an intense reduction in creep life. Results of fractographic studies on coated and uncoated specimens indicated a combination of ductile and brittle failure mechanisms for all samples. Although, the base failure mode in substrate was grain boundary voids, cracks initiated from coating at 760?C/657MPa and 871?C/343. No cracking in the coating was observed at 982?C/190MPa.

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Oxidation, Mechanical and Tribological Behaviors of the Ni/cBN Abrasive Coating-Coated Titanium Alloys

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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Thickness apropos stoichiometry in Pt-aluminide (PtAl) coating: Implications on the tensile properties of a directionally solidified Ni-base superalloy

Cited by 12 publications

References 22 publications

Comportamiento a fatiga de baja frecuencia del compuesto Rene®80 recubierto de aluminuro de platino cerca y por encima del DBTT

Comportamiento a fatiga de baja frecuencia del compuesto Rene®80 recubierto de aluminuro de platino cerca y por encima del DBTT

Creep rupture properties of bare and coated polycrystalline nickel-based superalloy Rene®80

Oxidation, Mechanical and Tribological Behaviors of the Ni/cBN Abrasive Coating-Coated Titanium Alloys

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