The Microstructure and Mechanical Properties of EP741NP Powder Metallurgy Disc Material

Radavich, J.F.; Furrer, David; Carneiro, Tadeu; Lemsky, Joseph; Lafayette, W.

doi:10.7449/2008/superalloys_2008_63_72

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Along the boundaries of the observed primary grains, there are overgrown precipitates of the γ' phase and carbide precipitates preventing grain growth and high-temperature creep. The microanalysis of the chemical composition of the tested material corresponds to the Russian EP741NP superalloy used for the construction of turbine discs in high-load turbine jet engines [12]. In order to unambiguously link the observed fatigue damage of the turbine disc material to the grain structure of the alloy used, microscopic observations were carried out, which clearly demonstrated that the material from which the turbine disc was made had a grain structure typical of the heat-resistant nickel superalloy produced using the powder metallurgy process.…”

Section: (C)mentioning

confidence: 99%

“…Along the boundaries of the observed primary grains, there are overgrown precipitates of the γ' phase and carbide precipitates preventing grain growth and hightemperature creep. The microanalysis of the chemical composition of the tested material corresponds to the Russian EP741NP superalloy used for the construction of turbine discs in high-load turbine jet engines [12].…”

Section: (C)mentioning

confidence: 99%

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Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Jóźwiak,

Kozakiewicz,

Kachel

et al. 2023

Materials

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This paper presents an analysis of the causes of damage and fragmentation to the high-pressure turbine (HTP) disc of the RD-33 engine mounted in the MIG-29 aircraft. The authors have carried out an analysis of the changes to the structure of the disc material, both in the areas containing cracks and in the undamaged areas. The impact of structural changes on the alterations in the analysed strength properties along the disc radius was assessed. Material tests were correlated with the analysis of the recorded engine parameters, indicating potential causes of the HPT disc fragmentation.

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Section: (C)mentioning

confidence: 99%

Section: (C)mentioning

confidence: 99%

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Jóźwiak,

Kozakiewicz,

Kachel

et al. 2023

Materials

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“…[12,179] Highperformance gas turbine engines require PM superalloys, such as EP741NP developed in Russia, with low C contents and additional carbide or oxide formers instead. [180][181][182] Table 1, Table 3, and Table 5 highlight the unique properties of B, C, and Zr in GB segregation and precipitation. However, information on the combined impact of microalloying elements on the mechanical properties of Ni-based superalloys is more sparse.…”

Section: Solid-state Microsegregationmentioning

confidence: 99%

“…[ 12,179 ] High‐performance gas turbine engines require PM superalloys, such as EP741NP developed in Russia, with low C contents and additional carbide or oxide formers instead. [ 180–182 ]…”

Section: Combined Impacts Of Boron Carbon and Zirconiummentioning

confidence: 99%

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

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Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni3(Al,Ti) γ′ precipitates, carbides (MC, M6C, and M23C6), borides (M2B, M3B2, and M5B3), and other inclusions. Microalloying additions of B, C, and Zr commonly improve high‐temperature strength and creep resistance, although excessive additions are detrimental. Grain boundary (GB) segregation may improve cohesion and displace embrittling impurities. Finely dispersed carbides and borides are desired to control grain size via GB pinning. However, excessive decoration of GBs may lead to failure during processing and in‐service. Hence, a systematic review on the roles of B, C, and Zr in cast and wrought Ni‐based superalloys is required. The current state of knowledge on GB segregation and precipitation is reviewed. Experimental and modeling results are compared across various processing steps. The impact of GB precipitation on mechanical properties is most well researched. Co‐precipitation in proximity to GBs interacting with local microstructure evolution and mechanical properties remains less explored. Addressing these gaps in knowledge allows a more complete understanding of processing–microstructure–properties relationships in advanced cast and wrought Ni‐based superalloys.

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“…Fig 6. Changes of of Al and Hf amount (mass fraction of total alloy) in γ phase with Hf content in FGH97 alloy…”

mentioning

confidence: 97%

PARTITION OF Hf AMONG THE PHASES AND ITS EFFECTS ON PRECIPITATES IN PM Ni--BASED SUPERALLOY FGH97

Zhang¹,

Wang²,

Benfu³

2013

ACTA METALLURGICA SINICA

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The partition behavior of hafnium among different phases in FGH97 PM (powder metallurgy) superalloy and its effects on the precipitation behaviors of M C carbide and γ phase were studied by means of 3DAP, SEM, TEM and physiochemical phase analysis. The results showed that element Hf mainly exists in γ phase and M C carbide, which makes γ composition transform to (Ni, Co) 3 (Al, Ti, Nb, Hf), also makes M C transform to (Nb, Ti, Hf)C. With Hf addition increasing, the proportion of Hf in γ maintains constant, but in M C carbide increases and in γ decreases, which means that partition ratio (R 1 ) between γ phase and M C carbide is decreased, while partition ratio (R 2 ) between γ phase and γ matrix is increased, the average partition ratio between γ phase and M C carbide is about 1 £ 0.1, and the average partition ratio between γ phase and γ matrix is about 1 £ 0.05. Hf is helpful to the precipitations of γ phase and M C carbide, the morphology and size of γ phase are influenced more by Hf than these of M C carbide.

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The Microstructure and Mechanical Properties of EP741NP Powder Metallurgy Disc Material

Cited by 6 publications

References 4 publications

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

PARTITION OF Hf AMONG THE PHASES AND ITS EFFECTS ON PRECIPITATES IN PM Ni--BASED SUPERALLOY FGH97

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