Structural characterization of the aged Inconel 718

Slama, C.; Abdellaoui, M.

doi:10.1016/s0925-8388(00)00789-1

Cited by 276 publications

(100 citation statements)

References 9 publications

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“…However, 718 alloy strengthened by the 00 intermetallic precipitate (Ni 3 Nb), has become and will continue to be the workhorse alloy for aircraft engines. [3][4][5][6] HIP processes take place under high pressure and high temperature conditions. It applies heat and pressure within an enclosed vessel to consolidate or dense materials such as castings.…”

Section: Introductionmentioning

confidence: 99%

“…By utilizing this advantage, rapid development in the use of HIP in cast superalloy was well known. 4,5,[10][11][12] The temperature and time parameters of heat treatment would significantly affect the strengthening phase of 00 precipitation, or the harmful phase such as Laves and phases for the precipitation-strengthening 718 alloy. Therefore, this study aimed to discuss the feasibility of solid solution and aging heat treatments, especially on the effects of different temperatures and soaking times of aging treatment on the precipitates, as well as the advantages and disadvantages of mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Influences of γ″ and δ Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Chang

Lee

Huang³

2010

Mater. Trans.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of γ″ and δ Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Chang

Lee

Huang³

2010

Mater. Trans.

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“…Inconel 718 superalloy is a niobium-modified nickel-base superalloy that is used widely in gas turbine and related high temperature of aerospace applications. 5,6) Inconel 718 superalloy is a precipitation hardenable, nickelbased superalloy that has high strength at room temperature and excellent creep as well as fatigue strengths at high temperatures. It used in gas turbines, rocket motors, spacecraft, nuclear reactors, pumps and tooling.…”

Section: Introductionmentioning

confidence: 99%

Influences of Soaking Time in Hot Isostatic Pressing on Strength of Inconel 718 Superalloy

et al. 2006

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Hot Isostatic Pressing (HIP) is widely used in the casting industry to remove the internal porosity generated during the casting process. It combines higher pressure and temperature to produce materials and parts with substantially better properties than those by other methods. This results in improved strength, ductility and fatigue life of castings. The aim of this paper is to discuss the methods and to find a suitable soaking time of HIP for Inconel 718 superalloy castings. In this study, the HIP temperature was maintained at 1453 K, pressure was kept 175 MPa and three different soaking time are 2, 3 and 4 h. The experiment results show that HIP treatment at 1453 K under the pressure of 175 MPa for 4 h for Inconel 718 superalloy is the optimum condition. It can decrease the porosity of Inconel 718 superalloy castings. In this study, it can reduce porosity about 86% after HIP treatment. For the tension test at a fast strain rate (0.001 s À1 ) that it increased the tensile strength by 31% at room temperature, 27% at 813 K, and 24% at 923 K. While at a very slow strain rate (0.0001 s À1 ), it increased the tensile strength by 24% at room temperature and 20% at 813 K. For a 3-point bending test, it showed that the optimum soaking time of HIP procedure could enhance the bending strength by 38% at room temperature and 26% at 813 K.

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“…The solution heat treatment was applied to the as cast Standard and Re-Containing IN718 alloys. Two types of solution treatment were carried out, the first one, standard solution treatment, was accomplished at 1273 K for 1 h [13][14][15], while the other one was made at 1440 K for 3 h (modified solution treatment), both were followed by water quenching. Solution treatment was followed by aging heat treatment at two levels of temperatures; 953 K and 1023 K for 2 h to 150 h.…”

Section: Heat Treatmentmentioning

confidence: 99%

Heat Treatment Effect on Microstructure and Mechanical Properties of Re-Containing Inconel 718 Alloy

El-Bagoury¹,

Ramadan²

2012

JMMCE

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The effect of Rhenium additions to the standard Inconel 718 (ST IN718) alloy as well as solution and aging treatments on microstructure and hardness property were studied. The microstructure of Re-containing alloys has higher volume fraction of δ phase than standard alloy. Conventional solution treatment (CST) at 1273 K for 1 h precipitates a thin film of δ phase at the grain boundaries as well as needle-like in  matrix; however, after modified solution at 1440 K for 3 h long, both types of δ phase precipitates entirely vanish from the microstructure. Small colonies of needle-like δ phase start to appear with aging at 1023 K for 4 h, after CST. Prolonging the aging time to 50 h, these colonies enlarge in size and spread in the matrix. XRD and TEM observations were used to identify the precipitation of hard " and ' phases.The changing in hardness measurements were evidence about the precipitation of these hard phases. CST have higher rate to increase in hardness with aging time comparing to modified solution specimens.

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Structural characterization of the aged Inconel 718

Cited by 276 publications

References 9 publications

Influences of γ″ and δ Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Influences of γ″ and δ Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Influences of Soaking Time in Hot Isostatic Pressing on Strength of Inconel 718 Superalloy

Heat Treatment Effect on Microstructure and Mechanical Properties of Re-Containing Inconel 718 Alloy

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Structural characterization of the aged Inconel 718

Cited by 276 publications

References 9 publications

Influences of &gamma;&Prime; and &delta; Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Influences of &gamma;&Prime; and &delta; Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Influences of Soaking Time in Hot Isostatic Pressing on Strength of Inconel 718 Superalloy

Heat Treatment Effect on Microstructure and Mechanical Properties of Re-Containing Inconel 718 Alloy

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Influences of γ″ and δ Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments

Influences of γ″ and δ Precipitations on the Microstructural Properties of 718 Alloy through HIP, Solid-Solution, and Different Aging Heat Treatments