Sintering and Joining of Ni-Based Superalloys via FAST for Turbine Disc Applications

Lin, Charis I.; Niuman, Sebastian J.; Kulkarni, A. K.; King, Derek S.; Singh, Jogender; Yamamoto, Namiko

doi:10.1007/s11661-019-05600-7

Cited by 13 publications

(4 citation statements)

References 52 publications

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“…Ni-based superalloy CM247LC powder was simultaneously sintered and joined to a solid Inconel 718 component, resulting in a diffusion bonding zone with no heat-affected zone or localized melting. [17] Similar results are expected with solid-state joining of two solids, but such study in the literature is currently limited to Inconel 718 joined to stainless steel 316L [18] and a brief study of Inconel 718 joined to Inconel 718, with limited microstructure analysis. [19] The effect of FAST solid-state joining on interface microstructure and bonding strengths of dissimilar Ni-based superalloys remains to be studied.…”

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confidence: 59%

Solid-State Joining of Dissimilar Ni-Based Superalloys via Field-Assisted Sintering Technology for Turbine Applications

Lin

Yamamoto

King

et al. 2021

Metall Mater Trans A

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Friction welding or electron/laser beam welding of nickel superalloys compromises the microstructure with localized melting and heat-affected zones (HAZ). In this work, Field-Assisted Sintering Technology (FAST) is studied as an alternative method for solid-state diffusion bonding of superalloys CM247LC and Inconel 718. Bonding microstructures and room-temperature tensile strengths are evaluated. Preliminary results suggest that FAST bonding leads to an interface with a compositional gradient without producing a HAZ and without losing tensile strength.

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confidence: 59%

Solid-State Joining of Dissimilar Ni-Based Superalloys via Field-Assisted Sintering Technology for Turbine Applications

Lin

Yamamoto

King

et al. 2021

Metall Mater Trans A

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“…One of the major techniques of powder metallurgy used in sintering technology is field-assisted sintering technology (FAST). FAST has been used recently in solid-state diffusion bonding as well [29]. FAST is promising since it can cover a wide range of applications and could potentially be used for joining of different superalloys, single crystals or polycrystalline crystal structures joining, high faying surface relative density, and localized melting zone free of vulnerable HAZ [30,31].…”

Section: Introductionmentioning

confidence: 99%

Solid-state diffusion bonding for INCONEl 617 superalloy using field-assisted sintering technology (FAST) guided by CALPHAD approach

Degnah,

Alnaser,

Kurdi

et al. 2024

Mater. Res. Express

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This study investigates solid-state diffusion bonding between two INCONEl 617 alloy samples using field-assisted sintering technology (FAST). The study focuses on analyzing the faying surface validating the theoretical alloy design modeling done by the CALculation of PHAse Diagrams (CALPHAD) approach followed by experimental validation. Varying kinetics’ limitations enabled phase stability and phase control governed by the CALPHAD approach alloy design. The alloy design contains a pseudo-binary phase diagram assisted with thermal mapping of a property phase diagram to obtain the optimum temperature of solid-state diffusion bonding while understanding phase fields and their evolution through Mo-increasing content and temperature increase. The FAST parameters recommended by CALPHAD were 800 °C under 10 MPa pressure with a holding time of 30 minutes. The investigation observations were promising where the faying surface contains γ only, while the further region on the alloy contains γ and γ`. It is worth mentioning that FAST advantage resulted in fine faying surface thickness of around 10 µm and a controlled heat affected zone (HAZ) leading to extreme reduction in recrystallization zone yielding an average grain size of 60-100 µm before and after diffusion bonding. Furthermore, two modes of metal carbide (MC) have been found, MC formed under the faying surface and micro-MC pools formed around the faying surface. 

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“…Traditionally, components are manufactured from one particular material or alloy despite requiring vastly different properties in sub-regions. Pope et al [17] demonstrated that FAST could be used to manufacture titanium alloy components with dissimilar alloy regions through diffusion bonding (and termed FAST-DB), the deformation behaviour of such diffusion bonds has also been investigated by Levano Blanch et al [18] Lin et al [19] have researched applying this technique to nickel-based superalloys by bonding CM247LC powder with solid IN718 plate with a diffusion zone of 20 to 30 lm being measured and bond strength being equal to that of the lower strength alloy. A follow up study [20] investigated the bonding of solid CM247LC with solid IN718, with a slightly narrower diffusion bond of 20 lm being measured.…”

Section: Introductionmentioning

confidence: 99%

A Machinability Assessment of the Novel Application of Field-Assisted Sintering Technology to Diffusion Bond (FAST-DB) and Functionally Grade Dissimilar Nickel-Based Superalloys

Lister,

Blanch,

Fernandez

et al. 2023

Metall Mater Trans A

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This work presents an alternative processing route to the conventional powder HIP—forge route for Nickel-based superalloys. Demonstrating how the field-assisted sintering technology (FAST) process can be exploited to successfully diffusion bond or functionally grade two or more Nickel-based superalloys from powder feedstock. The robustness of the process has been further demonstrated by the successful bonding of one alloy in powder form to another in the solid form. Chemical and microstructural analysis of the diffusion bond between the alloys is characterised, in both cases, with a short diffusion zone—in agreement with thermodynamic model predictions. A gradual transition in microhardness across the bond region was measured in all samples. A machinability assessment was also carried out through a simple face turning operation. Analysis of the cutting forces and machined surface shows signs of a directionality when machining across the bond region between two alloys, indicating that care must be taken when machining multi-alloy FAST-DB components.

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Sintering and Joining of Ni-Based Superalloys via FAST for Turbine Disc Applications

Cited by 13 publications

References 52 publications

Solid-State Joining of Dissimilar Ni-Based Superalloys via Field-Assisted Sintering Technology for Turbine Applications

Solid-State Joining of Dissimilar Ni-Based Superalloys via Field-Assisted Sintering Technology for Turbine Applications

Solid-state diffusion bonding for INCONEl 617 superalloy using field-assisted sintering technology (FAST) guided by CALPHAD approach

A Machinability Assessment of the Novel Application of Field-Assisted Sintering Technology to Diffusion Bond (FAST-DB) and Functionally Grade Dissimilar Nickel-Based Superalloys

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