Alleviating segregation and enhancing tensile properties of Inconel 718 superalloy by twin-roll casting and two-stage cold rolling

Ran, Rong; Wang, Yang; Zhang, Yuanxiang; Fang, Feng; Xia, Yu-kun; Zhang, Weina; Yuan, Guo; Wang, Guodong

doi:10.1016/j.jmrt.2022.07.143

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…For a successful application of WEDM, the electrical, thermal conductivity, specific heat capacity, and thermal expansion properties of the machined material play a critical role in obtaining a good surface finish [45]. Moreover, the grain boundaries and segregations in the material can alter these material properties [46,47]. The surface morphology of all machined samples in this study looked similar, revealing the presence of globules, craters, and debris.…”

Section: Resultsmentioning

confidence: 58%

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Gokcekaya,

Günen,

Ceritbinmez

et al. 2024

Int J Adv Manuf Technol

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Inconel 718 alloy is difficult to machine using conventional methods due to its physical properties. Thereby, additive manufacturing (AM) of IN718 components with near-net shapes has been extensively studied. Even though AM processes provide shape and size accuracy, there is still the need for the machining of the AM-processed components to achieve the final shape of a component. Laser powder bed fusion (LPBF) has been successfully utilized to fabricate near-net shape IN718 components; moreover, the microstructure of LPBF-IN718 was unique owing to the AM processing, resulting in differences in grain size, grain boundary characteristics, and grain orientations. Furthermore, these microstructural characteristics are expected to alter the machining performance of IN718. Therefore, this study investigated the wire electro-discharge machining (WEDM) performance of LPBF-718 samples compared to wrought IN718 while focusing on the unique microstructure characteristics of LPBF-IN718 samples (lamella, single-crystal, ploy-crystal). Three different cutting strategies (rough, semi-finish, and finish) were implemented to understand the performance of the multi-pass cutting phenomenon and its effect on the surface of IN718. For all samples, rough (single pass) cutting displayed high roughness, while finish (three passes) cutting exhibited good surface quality. Compositional analyses on the machined surface showed debris formation including Zn and Cu-containing recast material, indicating wire erosion. The surface of single-crystal LPBF-IN718 after the WEDM process was smooth owing to its large grain size and less amount of grain boundary, resulting in slow cutting speed but a good surface finish. Thus, this study, for the first time, investigated the effect of unique microstructural characteristics of LPBF-fabricated IN718 on WEDM performance and machined surface quality.

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Section: Resultsmentioning

confidence: 58%

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Gokcekaya,

Günen,

Ceritbinmez

et al. 2024

Int J Adv Manuf Technol

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“…Most of the early and recent reports [12,[16][17][18][19][20][21][22] related to the cold rolling of Inconel 718 studied the nucleation, growth, morphology, and quantification of δ precipitates and the effects on the mechanical properties [12,19,20] after solid solution heat treatment below the δ-phase solvus temperature (between 1005 and 1015 • C [23]). According to these reports, the nucleation sites and precipitation of the δ phase can be enhanced, followed by the depletion of Nb that greatly reduces the number and size of γ ′′ precipitates because of global recrystallization and the transformation of γ ′′ to the δ phase.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of the δ phase on the material properties are, however, controversial since some reports show affirmative results [22], while other effects are considered detrimental [21]. On the positive side, the controlled precipitation (quantity and morphology) of the δ phase is found to promote recrystallization, block dislocation motion, and retard grain growth, which leads to improved ductility [2, 15,16,19,21,24,25]. On the contrary, the δ phase (depending on the size and quantity) is brittle and can adversely affect the plasticity and impact the toughness of Inconel 718 [21,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling

Tucho,

Sletsjøe,

Sayyar

et al. 2024

Metals

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The as-received commercial Inconel 718 material was solid solution heat treated (ST), cold-rolled (CR), and precipitation-hardened (PH) to investigate the effects of deformation on the tensile properties, hardness, and texture. Three sets of specimens (0%, 20%, and 50% CR) were ST at 1100 °C/1 h, CR, and aged (720 °C/8 h + 650 °C/8 h) for the analysis. The ultimate tensile strength (UTS), 0.2% yield strength (YS), and elongation of 50% deformed condition were 1645 MPa, 1512 MPa, and 3.8%, respectively. The 20% deformation resulted in a balanced UTS (1348 MPa), YS (1202 MPa), and elongation (11%). The contribution of precipitation hardening to the strength decreased, while the contribution of CR increased with an increasing percentage of deformation. As the level of deformation increased, the size and quantity of γ″ decreased proportionally. The CR specimens produced a high density of nano/micro twins with twin planes oriented perpendicular to the RD-ND surface. The gradient of crystal orientation and internal features of large austenitic grains were generated by their preferred rotation. The cross-slip of screw dislocations induced a complete β-fiber consisting of {110}<112>, {112}<111>, and {123}<634>, with doubled intensity at the higher deformation. Additionally, the specimens were highly susceptible to the twinning-induced orientation emerged by a predominant <110>//ND. In the as-deformed condition, an incomplete but intense α-fiber clustered between {110}<001> and {110}<112> was characterized. Apart from achieving the highest strength, the current work demonstrates the effects of CR on the material strength without the complex influences of δ precipitates.

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Effect of powder size segregation on the mechanical properties of hot isostatic pressing Inconel 718 alloys

Tian

Wu²,

Lu³

et al. 2022

Journal of Materials Research and Technology

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Alleviating segregation and enhancing tensile properties of Inconel 718 superalloy by twin-roll casting and two-stage cold rolling

Cited by 7 publications

References 37 publications

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling

Effect of powder size segregation on the mechanical properties of hot isostatic pressing Inconel 718 alloys

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