TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy

Dehmas, Moukrane; Lacaze, Jacques; Niang, Aliou; Viguier, Bernard

doi:10.1155/2011/940634

Cited by 95 publications

(37 citation statements)

References 17 publications

(25 reference statements)

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“…The 5 and y'/y" phases precipitated out during the two-stage aging heat treatment, but the peaks of the 5 phase in the SR-1+HIP+HT-1 aged microstructure was the most significant. Its most intense peak was observed at 46.11° and this 29 value is consistent with the experimental results from other research [13]. The y' usually forms at a higher temperature o f ageing (720 °C) while the precipitation of y" takes place at the lower temperature of ageing (620 °C).…”

Section: A Ged Microstructures After Different H Eat Treatment Conditsupporting

confidence: 91%

“…The y' usually forms at a higher temperature o f ageing (720 °C) while the precipitation of y" takes place at the lower temperature of ageing (620 °C). Both phases are metastable and at higher temperature usually more than 650 °C the y" coarsens very fast and transforms into either y' or orthorhombic 5 [8,13]. The high intensities of NbC peaks were detected in the SR-2+HIP+HT-2 aged microstructure ( Figure 3).…”

Section: A Ged Microstructures After Different H Eat Treatment Conditmentioning

confidence: 97%

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Microstructural Analysis on 3D Printed Nickel-based Alloy 718

Aung¹,

Morton²,

Chen³

et al. 2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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Abstract3D printing is a rapidly growing technology for the fabrication of nickel-based alloy products in the aerospace industry because of its time efficiency, relative affordability, ease of use and design freedom. The alloy was initially built by selective laser melting technique, followed by stress relieving, hot isostatic pressing, and heat treatment processes. How process parameters affect the microstructure of 3D printed alloy 718, however, is not well understood. In this research, the grain size changes and the microstructural evolution of as-built samples were studied under different heat treatment conditions. The HT-1 treatment (solution treatment at 950 °C/1 h/water quenching followed by two-stage ageing at 720 °C/8 h/furnace cooling to 620 °C/8 h/air cooling to room temperature) reduced the grain size of aged microstructure twice compared with the standard AMS 5662 (solution treatment at 980 °C/1 h/water quenching followed by two-stage ageing at 720 °C/8 h/furnace cooling to 620 °C/8 h/air cooling to room temperature) due to the existence of acicular grain boundary 5 phase. However, the high volume fraction of y'/y" precipitates in the HT-2 (solution treatment at 1035 °C/1 h/water quenching followed by twostage ageing at 720 °C/10 h/furnace cooling to 620 °C/10 h/air cooling to room temperature) aged microstructure led to increase the microhardness value.

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Section: A Ged Microstructures After Different H Eat Treatment Conditsupporting

confidence: 91%

Section: A Ged Microstructures After Different H Eat Treatment Conditmentioning

confidence: 97%

Microstructural Analysis on 3D Printed Nickel-based Alloy 718

Aung¹,

Morton²,

Chen³

et al. 2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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“…The δ phase has a chemical structure of Ni 3 Nb with an orthorhombic D0 a crystal structure [9][10][11][12]. It is an incoherent phase in relation to the γ matrix [10,11].…”

Section: Grain Boundary Phases δ Phasementioning

confidence: 99%

“…It has often been said that the precipitation of δ phase within Inconel 718 and ATI 718Plus causes a degradation in mechanical properties [9,12,[76][77][78]. This is due to the transformation of γ into δ phase within the microstructure.…”

Section: Effect On Mechanical Propertiesmentioning

confidence: 99%

Grain boundary precipitation in Inconel 718 and ATI 718Plus

Hassan

Corney

2017

Materials Science and Technology

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Grain boundary precipitates in Inconel 718 and ATI 718Plus are important to control during hot working processes, since they can control the grain size. Precipitating excessive or insufficient amounts can be detrimental to the final component. Therefore, it is important for manufacturers to understand the formation and kinetics of grain boundary precipitation and the effect this has on mechanical properties. This review considers the background of grain boundary precipitation, including the effect of the thermal stability of γ and γ phases. In addition, the effect of stress on the grain boundary phases and their precipitation kinetics in different conditions are also included. Also, the impact of grain boundary precipitation on the mechanical properties is explored. ARTICLE HISTORY

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“…The material has been rebuilding after plastic deformation. Grain boundaries are rich in δ phase [27]. The precipitation of δ phase in the form of thin plates, is carried in the discontinuous reaction, starting at the grain boundaries, and at a later stage in the form of intergranular precipitates.…”

Section: Research Resultsmentioning

confidence: 99%

Comparative Analysis of Properties and Microstructure of the Plastically Deformed Alloy Inconel®718, Manufactured by Plastic Working and Direct Metal Laser Sintering

Żaba¹,

Puchlerska²,

Kwiatkowski³

et al. 2016

Archives of Metallurgy and Materials

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Nickel superalloys as Inconel® are materials widely used in the aerospace industry among others for diffusers, combustion chamber, shells of gas generators and other. In most cases, manufacturing process of those parts are used metal strips, produced by conventional plastic processing techniques, and thus by hot or cold rolling. An alternative technology allowing for manufacturing components for jet engines is the technique of 3D printing (additive manufacturing), and most of all Direct Metal Laser Sintering, which is one of the latest achievement in field of additive technologies. The paper presents a comparative analysis of the microstructure and mechanical properties of the alloy Inconel®718 manufactured by plastic working and Direct Metal Laser Sintering technology, in the initial state, after deformation and after heat treatment.

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TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy

Cited by 95 publications

References 17 publications

Microstructural Analysis on 3D Printed Nickel-based Alloy 718

Microstructural Analysis on 3D Printed Nickel-based Alloy 718

Grain boundary precipitation in Inconel 718 and ATI 718Plus

Comparative Analysis of Properties and Microstructure of the Plastically Deformed Alloy Inconel®718, Manufactured by Plastic Working and Direct Metal Laser Sintering

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