Dissimilar linear friction welding of selective laser melted Inconel 718 to forged Ni-based superalloy AD730™: Evolution of strengthening phases

Tabaie, Seyedmohammad; Rézaï-Aria, Farhad; Flipo, Bertrand C.D.; Jahazi, Mohammad

doi:10.1016/j.jmst.2021.03.086

Cited by 25 publications

(4 citation statements)

References 69 publications

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“…However, along with γ″ phase, Nb also forms lave and delta (δ) precipitates along the interdendritic regions of cast and weldments [6], which are susceptible to hot cracking [7]. Nowadays, aero-engine hot components are fabricated by joining cast structural parts with wrought components to reduce the manufacturing costs of singlepiece castings components [8]. The problems encountered during this process are the formation of high amount of segregation and susceptibility to hot cracking in the fusion welding process [9][10].…”

Section: Introductionmentioning

confidence: 99%

Reduction of ASZ size and enhancement of mechanical properties of TLP bonded IN718 joint using post bond heat treatment process

Tarai

Pal²,

Robi³

2023

Preprint

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Transient liquid phase (TLP) bonding can be used to join Inconel 718 superalloy because the bond properties are similar to the parent material properties and little melting of base material. Presence of centerline eutectic and boride precipitates in the microstructure of the TLP bonded Inconel 718 joints affects mechanical properties of the joints. The eutectics and borides should be minimized to enhance the mechanical properties of the bond. This can be achieved to a great extent by prolonged isothermal holding. However, it can induce adverse effects by modifying the microstructure of the base material. Post bond heat treatment (PBHT) processes can be implemented to improve the mechanical properties without inducing any harmful effect of prolonged heating. In the present work, the effect of PBHT technique (i.e. solution treatment and double aging) on the microstructural evolution and improvement in mechanical properties were investigated. The ultimate tensile strength (UTS) and microhardness of TLP bond before and after the PBHT were analyzed and compared with the as-received workpiece. FESEM, FETEM and XRD analysis were used to quantify different precipitates formed during PBHT of TLP bond. The results showed that the PBHT improved the microstructure and mechanical properties of the bonded samples. After the solution treatment and double aging, a maximum UTS of 1210 MPa was obtained, which correspond to a 113.5% increase. The improvement of bond strength was attributed to increase volume fraction of γ' and γ" type strengthening phases during double aging and a decrease in the fraction of Nb-Mo type borides in the diffusion affected zone.

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Section: Introductionmentioning

confidence: 99%

Reduction of ASZ size and enhancement of mechanical properties of TLP bonded IN718 joint using post bond heat treatment process

Tarai

Pal²,

Robi³

2023

Preprint

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“…Li et al [29] found that the presence of γ' phase can hinder DRX; hence, the occurrence of DRX is usually observed in the region where intergranular and intragranular γ' are dissolved. Overall, the recrystallised γ grain size has been consistently recognised as an important factor in refining material microstructure of the weld and directly determining the hardness and tensile strength of weld [30][31][32]. In order to optimise the design of LFW process parameters, the influence of thermomechanical processes on the microstructural evolution of IN718 needs to be systematically and quantitatively analysed in relation to the DRX of γ grain during LFW process.…”

Section: Introductionmentioning

confidence: 99%

Computational modelling of dynamic recrystallisation of Ni-based superalloy during linear friction welding

Okeke

Harrison

Tong

2022

Int J Adv Manuf Technol

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Linear friction welding (LFW) is an advanced joining technology used for manufacturing and repairing complex assemblies like blade integrated disks (blisks) of aeroengines. This paper presents an integrated multiphysics computational modelling for predicting the thermomechanical-microstructural processes of IN718 alloy (at the component-scale) during LFW. Johnson–Mehl–Avrami-Kolmogorov (JMAK) model was implemented for predicting the dynamic recrystallisation of γ grain, which was coupled with thermomechanical modelling of the LFW process. The computational modelling results of this paper agree well with experimental results from the literature in terms of γ grain size and weld temperature. Twenty different LFW process parameter configurations were systematically analysed in the computations by using the integrated model. It was found that friction pressure was the most influential process parameter, which significantly affected the dynamic recrystallisation of γ grains and weld temperature during LFW. The integrated multiphysics computational modelling was employed to find the appropriate process window of IN718 LFW.

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“…Accordingly, NASA designed a dual-microstructure heat treatment technology (DMHT) in which the microstructure and property variation can be achieved within any given component [3,4]. In an alternative approach, joining the wrought to the cast superalloys by friction welding has emerged as an effective method, such as IN718 to IN713 [5], IN718 to Mar-M247 [6], LRHS to Mar-M247 [7], and others [8][9][10][11][12]. In superalloy friction joints, the forming of an interlayer is unavoidable [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Welded Zone Property on Behavior of a Dissimilar Superalloys Friction Joint under Creep Loading at Elevated Temperature - A Simulation Approach

Tra

2022

AMM

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The forged superalloy Inconel 718 and cast superalloy Mar-M247 were joined via friction welding. The welded zone was recrystallized and formed a thin representative layer on the forged superalloy side adjacent to the interface. The effect of the creep property of the welded layer on the behavior of the joint under creep loading was investigated via numerical simulations. Despite the welded layer being relatively narrow (approximately 200 mm), it significantly effects the stress state and the creep damage parameters in and around the welded zone. When the creep rate of the welded layer is lower than that of the base alloy, the stress concentration is dramatically increases adjacent to the interface. However, the creep rate of the welded layer creep rate is higher than that of the base alloy, the interface stress concentration is reduced. The creep strain and stress exhibited an out-phase relation.

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Dissimilar linear friction welding of selective laser melted Inconel 718 to forged Ni-based superalloy AD730™: Evolution of strengthening phases

Cited by 25 publications

References 69 publications

Reduction of ASZ size and enhancement of mechanical properties of TLP bonded IN718 joint using post bond heat treatment process

Reduction of ASZ size and enhancement of mechanical properties of TLP bonded IN718 joint using post bond heat treatment process

Computational modelling of dynamic recrystallisation of Ni-based superalloy during linear friction welding

Effect of the Welded Zone Property on Behavior of a Dissimilar Superalloys Friction Joint under Creep Loading at Elevated Temperature - A Simulation Approach

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