Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys: Precipitation reactions and incipient recrystallisation

Tang, Yuanbo T.; Panwisawas, Chinnapat; Jenkins, Benjamin M.; Liu, Junliang; Shen, Zhao; Salvati, Enrico; Gong, Yilun; Michalik, Š.; Roebuck, B; Bagot, P.A.J.; Lozano-Pérez, Sergio; Grovenor, C.R.M.; Moody, Michael P.; Korsunsky, Alexander M.; Collins, David M.; Reed, Roger C.

doi:10.1016/j.addma.2023.103389

Cited by 9 publications

(2 citation statements)

References 71 publications

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“…Figure 5 shows the evolution of the simulated extrusion force versus time for two different values of the extrusion speed. An interpretation of the force evolution can be proposed; during the first phase of the process (1), (see Figure 5), the slope of the curve is constant and relatively low, up to the beginning of the second phase (2), where a rapid increase is observed. This is mainly related to the large plastic deformation occurring in the billet.…”

Section: Extrusion Process and Force Evolution: Numerical Simulation ...mentioning

confidence: 99%

“…Inconel 718 is probably one of the most important among the nickel-based superalloys, due to its exceptional properties such as high oxidation resistance, corrosion resistance and high mechanical strength, even at high temperatures. For this reason, Inconel 718 is currently widely employed in the aircraft engine industry [1,2]. Specifically, it is used in many critical engine components (i.e., diffusers, combustion chambers, shells of gas generators, rocket engines and gas turbines), accounting for over 30% of the total finished component mass of a modern aircraft engine [3].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Hot Extruded Inconel 718

Bacchetti

Coppola

Bona

et al. 2023

Metals

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Inconel 718 is a widely used superalloy, due to its unique corrosion resistance and mechanical strength properties at very high temperatures. Hot metal extrusion is the most widely used forming technique, if the manufacturing of slender components is required. As the current scientific literature does not comprehensively cover the fundamental aspects related to the process–structure relationships, in the present work, a combined numerical and experimental approach is employed. A finite element (FE) model was established to answer three key questions: (1) predicting the required extrusion force at different extrusion speeds; (2) evaluating the influence of the main processing parameters on the formation of surface cracks using the normalized Cockcroft Latham’s (nCL) damage criterion; and (3) quantitatively assessing the amount of recrystallized microstructure through Avrami’s equation. For the sake of modeling validation, several experimental investigations were carried out under different processing conditions. Particularly, it was found that the higher the initial temperature of the billet, the lower the extrusion force, although a trade-off must be sought to avoid the formation of surface cracks occurring at excessive temperatures, while limiting the required extrusion payload. The extrusion speed also plays a relevant role. Similarly to the role of the temperature, an optimal extrusion speed value must be identified to minimize the possibility of surface crack formation (high speeds) and to minimize the melting of intergranular niobium carbides (low speeds).

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Section: Extrusion Process and Force Evolution: Numerical Simulation ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Hot Extruded Inconel 718

Bacchetti

Coppola

Bona

et al. 2023

Metals

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The Dissolution Behaviors of Carbides During Solution Treatment for AMSC‐DB Ni‐Based Superalloys Fabricated by Laser‐Directed Energy Deposition and Forging

Yu,

Hu,

Chen

et al. 2024

Adv Eng Mater

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To gain insights into the microstructure evolution of as‐fabricated Ni‐based superalloys during post‐heat treatments, a comparative microstructure analysis is made based on the AMSC‐DB alloy samples fabricated by laser‐directed energy deposition (L‐DED) and forging. In L‐DED samples, the (Nb,Ta)C carbides experience a continuous dissolution process during the solution treatment. In contrast, the coarsening behaviors of carbide particles in forge alloys are observed to take place simultaneously with their dissolution. Characterization results show that the carbides in L‐DED alloy present uniformly distributed particle sizes and nodular shapes with much irregular surface curvatures. Also, less‐pronounced Nb segregation behaviors in carbide vicinity are found in L‐DED alloys. Therefore, the difference in carbide dissolution kinetics in L‐DED and forge alloys can be ascribed to the combined effects of phase morphologies and local chemical driving forces. Correspondingly, the segmented changes in grain boundary misorientations and recrystallization process in forge alloys are observed to be highly coupled with the carbide dissolution behaviors, compared to the continuous microstructural evolution in L‐DED alloy. The different recrystallization behaviors can be quantitatively reflected by the Zener pinning effect. This work sheds light on the proper design of post‐heat treatments for L‐DED alloys compared to the traditionally manufactured counterparts.

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