Effect of Double Aging Heat Treatment on the Short-Term Creep Behavior of the Inconel 718

Caliari, Felipe Rocha; Candioto, Katia Cristiane Gandolpho; Couto, Antônio Augusto; Nunes, Carlos Ângelo; Reis, Danieli Aparecida Pereira

doi:10.1007/s11665-016-2051-2

Cited by 30 publications

(16 citation statements)

References 26 publications

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“…Yen et al and Wisniewski et al discovered that the serrated grain boundary greatly improves the creep resistance of Ni‐based superalloys. Caliari et al discovered that the precipitations of

γ^{'}

and

γ^{″}

phases by the double aging heat treatment can enhance the creep resistance of Inconel 718 alloy. Chen et al found that the steady‐stage creep rate of the nickel‐based superalloy is related to the size of

γ^{″}

precipitates.…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

et al. 2017

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Uniaxial creep tensile experiments are performed to study the influences of initial δ phase (Ni 3 Nb) on the creep features and fracture behaviors of a nickel-based superalloy. Experimental results show that the creep features and fracture behaviors of the researched superalloy are closely relevant to the volume fraction of initial δ phase. The minimum creep rate increases with the increased volume fraction of initial δ phase. The appropriate volume fraction of initial δ phase can improve the creep resistance and plasticity. So, the rupture time and the elongation to fracture initially increase, when the volume fraction of initial δ phase is relatively low, and then decrease with the increase of volume fraction of initial δ phase. Additionally, with the increased initial δ phase, the failure mode changes from a typical intergranular fracture to the mixed fracture pattern of ductile intergranular and cleavage fracture.

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“…Yen et al and Wisniewski et al discovered that the serrated grain boundary greatly improves the creep resistance of Ni‐based superalloys. Caliari et al discovered that the precipitations of

γ^{'}

and

γ^{″}

γ^{″}

precipitates.…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

et al. 2017

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“…Its A RT value of ~1.07 is underestimated, because 980-RD sample undergoes more time (~17.7 h) at a higher stress (759–828 MPa). Only ~25% of rupture life (~58 h) is retained in double-aged IN718 alloy when the tested stress increases from 625 MPa to 700 MPa at 650 °C [ 26 ]. Therefore, the nearly linear-aligned carbides, even with a limited amount, have a gradually increased role in the anisotropic behavior of rupture life, particularly when the string of δ phases also coexists, i.e., in fine-grained samples.…”

Section: Discussionmentioning

confidence: 99%

Selective Anisotropy of Mechanical Properties in Inconel718 Alloy

Liang

Zhou

et al. 2021

Materials

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Mechanical anisotropy behaviors are investigated in slightly rolled Inconel718 alloy with string-like δ phase and carbides produced during various solid-solution and aging treatments. A weak anisotropy in the strengths and rupture properties at 650 °C is visible, whereas ductility, i.e., reduction in area (RA) and impact toughness (CVN), presents a sound anisotropy behavior. MC carbides promote the operation of slip systems and thus are conducive to weakening the strength anisotropy. The RA anisotropy mainly stems from high-density δ phase particles that provide more crack nucleation sites and stimulate rapid propagation because of the shorter bridge distance between micro-cracks at the rolling direction. In contrast, CVN anisotropy arises from both δ phase and carbides at a lower solid-solution temperature of 940 °C but only depends on carbides at 980 °C where the δ phase fully dissolves. Apart from dislocation motions operated at room temperature, the activated grain boundary processes are responsible for the weak anisotropy of rupture properties at the elevated temperature. This work provides a guideline for technological applications in the hot working processes for Inconel718 alloys.

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“…Caliari et al [41] also suggested that the creep mechanism of Inconel 718 that was double aged and tested at 650-700 • C and 510-700 MPa is controlled by the interaction of dislocations with the precipitates. Rodriguez et al [42] found for cyromilled Inconel 625 alloy tested at 650 • C and 207 MPa a value of activation energy for creep of 385 kJ/mol.…”

Section: Creep Testsmentioning

confidence: 99%

Mechanical Behavior of Inconel 625 at Elevated Temperatures

Oliveira

Couto

Almeida

et al. 2019

Metals

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Inconel 625 is a nickel-based alloy that is mainly used in high-temperature applications. Inconel 625 exhibits an unstable plastic flow at elevated temperatures characterized by serrated yielding, well-known as the Portevin-Le Chatelier effect. The evaluation of the mechanical properties of Inconel 625 at high temperatures is the aim of this work. The tensile tests were executed in temperatures ranging from room temperature to 1000 °C with strain rates of 2 × 10−4 to 2 × 10−3 s−1. The creep tests were executed in the temperature range of 600–700 °C and in the stress range of 500–600 MPa in a constant load mode. The optical and scanning electron microscopes were used for surface fracture observation. In the curves obtained at 200–700 °C the serrated stress-strain behavior was observed, which was related to the dynamic strain aging effect. The yield strength and the elongation values show anomalous behavior as a function of the test temperature. An intergranular cracking was observed for a specimen tensile tested at 500 °C that can be attributed to the decohesion of the carbides along the grain boundaries. The fracture surface of the specimen tensile tested at 700 °C showed the predominance of transgranular cracking with tear dimples with a parabolic shape.

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Effect of Double Aging Heat Treatment on the Short-Term Creep Behavior of the Inconel 718

Cited by 30 publications

References 26 publications

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Selective Anisotropy of Mechanical Properties in Inconel718 Alloy

Mechanical Behavior of Inconel 625 at Elevated Temperatures

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