Vacuum TLP bonding of Inconel 617 superalloy using Ni-Cr-Si-Fe-B filler metal: Metallurgical structure and mechanical properties

Esmaeili, H; Mirsalehi, Seyyed Ehsan; Farzadi, A.

doi:10.1016/j.vacuum.2018.03.048

Cited by 45 publications

(11 citation statements)

References 23 publications

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“…It has been well established that a typical TLP bonded joint may consist of three distinct zones: (1) an athermal solidification zone (ASZ), (2) an isothermal solidification zone (ISZ), and (3) a diffusion-affected zone (DAZ) [7,17,[19][20][21]. Figure 3a shows the microstructure of a copper/nickel-superalloy sample TLP-bonded at 1030 • C for 60 min.…”

Section: Microstructural Examinationsmentioning

confidence: 99%

“…Bonding temperature is normally selected between the liquidus temperature of the interlayer and the solidus temperature of the material with the lower melting point, i.e., copper alloy in this work. A sufficient holding time is necessary to complete the isothermal solidification and avoid formation of eutectic phases in the centreline, which can have adverse effects on mechanical properties of the joint [9,[14][15][16][17]. For instance, S. Hadibeyk obtained complete isothermal solidification at 1130 • C within 100 min in dissimilar TLP bonded Ni-based GTD-111 and Co-based FSX-414 superalloys [15].…”

Section: Introductionmentioning

confidence: 99%

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Fail-Safe Joints between Copper Alloy (C18150) and Nickel-Based Superalloy (GH4169) Made by Transient Liquid Phase (TLP) Bonding and Using Boron-Nickel (BNi-2) Interlayer

Zhang

Shirzadi

2021

Metals

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Joining heat conducting alloys, such as copper and its alloys, to heat resistant nickel-based superalloys has vast applications in nuclear power plants (including future fusion reactors) and liquid propellant launch vehicles. On the other hand, fusion welding of most dissimilar alloys tends to be unsuccessful due to incompatibilities in their physical properties and melting points. Therefore, solid-state processes, such as diffusion bonding, explosive welding, and friction welding, are considered and commercially used to join various families of dissimilar materials. However, the solid-state diffusion bonding of copper alloys normally results in a substantial deformation of the alloy under the applied bonding load. Therefore, transient liquid phase (TLP) bonding, which requires minimal bonding pressure, was considered to join copper alloy (C18150) to a nickel-based superalloy (GH4169) in this work. BNi-2 foil was used as an interlayer, and the optimum bonding time (keeping the bonding temperature constant as 1030 °C) was determined based on microstructural examinations by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), tensile testing, and nano-hardness measurements. TLP bonding at 1030 °C for 90 min resulted in isothermal solidification, hence obtained joints free from eutectic phases. All of the tensile-tested samples failed within the copper alloy and away from their joints. The hardness distribution across the bond zone was also studied.

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Section: Microstructural Examinationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fail-Safe Joints between Copper Alloy (C18150) and Nickel-Based Superalloy (GH4169) Made by Transient Liquid Phase (TLP) Bonding and Using Boron-Nickel (BNi-2) Interlayer

Zhang

Shirzadi

2021

Metals

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“…Brazing [4][5][6][7][8][9][10] and transient liquid phase bonding [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] are attractive for joining Ni-based superalloys. For example, Luo et al used a BNi-2 filler metal to join Hastelloy C-276 (UNS N10276) [7].…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Diffusion-Welded Alloy 617

Sah

Hwang

Kim

2021

Metals

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Plate-type heat exchangers are anticipated to be used in the next-generation nuclear industry, and solid-state diffusion welding is a critical technology for building plate-type heat exchangers with high integrity. In this study, we manufactured a diffusion weldment and evaluated its creep behavior. Microscopic analysis revealed that Al-rich oxides were developed along the interface, significantly impeding grain-boundary movement across the interface. Oxide-containing planar grain boundaries resulted in premature brittle fracture at the interface with less than 9% creep strain under all test conditions. The time to rupture and time to 1% creep strain of the diffusion weldment were less than those of the as-received alloy, while the slopes in double-logarithmic plots were almost identical for both alloys. In a Larson–Miller parameter study, the stress to rupture of the diffusion weldment reached 95.59% of that of the as-received alloy, whereas the stress to 1% creep strain steeply decreased in the low-stress range.

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“…The selection of interlayer materials is important for different nickel-base superalloys during TLP joining technique. Ismaili et al [17,18] used BNi-3 and BNi-6 interlayers for similar bonding of Inconel 617. In a work by Farzadi et al [19] on the effect of interlayers and bonding time on TLP bonding of Inconel 617, it was found that the BNi-1 interlayer and the bonding time of 300 min resulted in the highest mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bonding Temperature on Microstructure and Mechanical Properties of Dissimilar Joint Between Inconel 617 and Stainless Steel 310

Mobarakeh

Atapour

Niroumand

et al. 2021

Metallogr. Microstruct. Anal.

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Dissimilar transient liquid phase (TLP) bonding between stainless steel 310 and Inconel 617 was carried out using a BNi-2 interface layer. TLP joints were fabricated at 1040, 1070 and 1100 °C for a bonding time of 60 min. In addition to microstructural evaluations, the mechanical properties of different TLP joints were also studied. The results indicated that increasing the bonding temperature resulted in decreasing the solidification zones and accelerating the formation of the intermetallic compounds. Among different TLP joints, the joint fabricated at 1040 °C exhibited the highest shear strength of 611 MPa. SEM investigations of the fractured surfaces revealed that the formation of higher amount of intermetallic compounds at higher temperatures deteriorated the shear strength of the Inconel 617/Stainless Steel 310 TLP joint.

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Vacuum TLP bonding of Inconel 617 superalloy using Ni-Cr-Si-Fe-B filler metal: Metallurgical structure and mechanical properties

Cited by 45 publications

References 23 publications

Fail-Safe Joints between Copper Alloy (C18150) and Nickel-Based Superalloy (GH4169) Made by Transient Liquid Phase (TLP) Bonding and Using Boron-Nickel (BNi-2) Interlayer

Fail-Safe Joints between Copper Alloy (C18150) and Nickel-Based Superalloy (GH4169) Made by Transient Liquid Phase (TLP) Bonding and Using Boron-Nickel (BNi-2) Interlayer

Creep Behavior of Diffusion-Welded Alloy 617

Effect of Bonding Temperature on Microstructure and Mechanical Properties of Dissimilar Joint Between Inconel 617 and Stainless Steel 310

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