δ Phase precipitation in Inconel 718 and associated mechanical properties

Anderson, Magnus; Thielin, A.-L.; Bridier, Florent; Bocher, Philippe; Savoie, Jean

doi:10.1016/j.msea.2016.09.114

Cited by 182 publications

(71 citation statements)

References 19 publications

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“…It can be observed are moderate and slightly overlap for low precipitates fractions. In Anderson (), it is shown that the presence of intragranular precipitates combined with moderate amounts of intragranular precipitates enhances the formability of the material. This behaviour is obtained by treatments at high temperatures and moderate time.…”

Section: Resultsmentioning

confidence: 99%

“…The methodology developed in this work allowed the delta precipitates in an Inconel 718 alloy to be segmented and to be discriminated according to their location relative to the grain boundaries. This distinction proved to be useful for analyzing the evolution of the formability of the material in function of its thermal history (Anderson, ).…”

Section: Discussionmentioning

confidence: 99%

“…It was applied to samples heat treated at different temperatures and times. An outline of the results is presented, the reader being invited to refer to (Anderson, ) for an in‐depth discussion on the mechanical consequences of the thermal treatment parameters.…”

Section: Introductionmentioning

confidence: 99%

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Inter‐ and intragranular delta phase quantitative characterization in Inconel 718 by means of image analysis

Vanderesse

Anderson

Bridier

et al. 2016

Journal of Microscopy

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This paper describes an image processing method for discriminating the inter-and intragranular delta phase precipitates in Inconel 718 (IN 718). The successive practical operations and the motivations of their choices are presented in detail. The method was applied to IN 718 specimens heat treated with different parameters to produce microstructures containing various amounts of both types of precipitates. They were characterized by electron microscopy in backscattered electron imaging. The main difficulty arose from the fact that the brightness distributions of inter-and intragranular precipitates partially overlap. Additional information on their morphology and their spatial distribution had to be exploited in order to differentiate them. The shape and the orientation of the precipitates were evaluated using the structure tensor, an operator that quantifies the directionality of the intensity distribution in an image. The distance between parallel precipitates was also used as an additional property to identify clusters of intragranular precipitates.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Inter‐ and intragranular delta phase quantitative characterization in Inconel 718 by means of image analysis

Vanderesse

Anderson

Bridier

et al. 2016

Journal of Microscopy

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“…Many studies about the mechanical properties of the GH4169 alloy have been conducted under different conditions, such as thermal compression, thermal tension, and room temperature tension [8][9][10][11][12][13][14][15][16][17][18]. Lin et al [9] pointed out that the formation of the δ phase causes the accumulation of dislocations during 2 of 13 hot tensile deformation, which leads to an increase in the work hardening rate of the alloy.…”

Section: Introductionmentioning

confidence: 99%

“…Wen et al [11] proposed that the dislocations pile up around the δ phase at a low strain, which would aggravate the strain hardening behavior and further lead to increased flow stress during hot deformation. Anderson et al [12] found that the precipitation position of the δ phase has different effects on the mechanical properties of the GH4169 alloy. The δ phase tended to cause hardening of the alloy when it precipitated inside the grain, and the forming property of the alloy was improved when it precipitated at the grain boundary.…”

Section: Introductionmentioning

confidence: 99%

Effect of the δ Phase on the Tensile Properties of a Nickel-Based Superalloy

Zhu

Chen

Wang

et al. 2019

Metals

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Nickel-based superalloys are widely used in aerospace and other fields due to their excellent properties. In this study, the aging treatment and tensile tests of a GH4169 alloy were carried out. The effects of the δ phase on the alloy’s mechanical properties and fracture behavior were studied. The results showed that the appearance of the δ phase changed from a short rod shape to a needle shape with an increase in aging time. The precipitation method changed from a single mode of precipitation along the grain boundary to two modes of precipitation along the grain boundary and direct precipitation inside the grain. The yield strength and ultimate tensile strength of the alloy first increased and then decreased with an increase in aging time and were related with the microstructure of the δ phase. The similar Widmanstatten structure was not conducive to the mechanical properties of the alloy. The distribution of the δ phase led to the generation of inhomogeneous strain and limited the surface roughening during plastic deformation. The voids initiated at the interface between the δ phase and the matrix γ phase or directly from the δ phase fracture site.

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Isothermal Solid‐State Transformations of Inconel 718 Alloy Fabricated by Selective Laser Melting

Huang

Wang

2020

Adv Eng Mater

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Inconel 718 samples have been fabricated by selective laser melting (SLM) and subjected to a series of heat treatments to study the isothermal precipitation behaviors of δ, γ′, and γ″ phases. A time–temperature–transformation (TTT) diagram for as‐built Inconel 718 is finally plotted. The morphology, size, and distribution of δ phase are studied, and the corresponding transformation kinetics is analyzed by Avrami equation. The results demonstrate that the transformation rate at 900 °C is the highest, though the nose of the TTT curve occurs at 860 °C after an incubation period of 10 min. As the aging temperature increases (620–820 °C), the precipitation rate of γ′/γ″ increases and the time to reach peak hardness decreases. The nose of the TTT curve for γ′/γ″ precipitation occurs at 820 °C after only 32 s. Nevertheless, when aged above 720 °C, the peak hardness decreases. In addition, the age hardening can be described by Avrami equation when δ phase is absent (620–770 °C). In summary, SLMed Inconel 718 exhibits a faster precipitation kinetics compared with wrought material, whereas their phase transition temperatures are similar.

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δ Phase precipitation in Inconel 718 and associated mechanical properties

Cited by 182 publications

References 19 publications

Inter‐ and intragranular delta phase quantitative characterization in Inconel 718 by means of image analysis

Inter‐ and intragranular delta phase quantitative characterization in Inconel 718 by means of image analysis

Effect of the δ Phase on the Tensile Properties of a Nickel-Based Superalloy

Isothermal Solid‐State Transformations of Inconel 718 Alloy Fabricated by Selective Laser Melting

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