Aging response of transient liquid phase bonded wrought IN718 superalloy: influence of post-bond heat treatment

Pouranvari, M.; Ekrami, A.; Kokabi, A.H.

doi:10.1179/1362171813y.0000000170

Cited by 27 publications

(22 citation statements)

References 31 publications

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“…18,19,25 In addition, it was shown previously that boride precipitation can influence the aging behaviour of IN718. 25 It is interesting to note that the bonding thermal cycle (i.e. homogenisation) can affect the microstructure of the cast IN718 BM.…”

Section: Resultsmentioning

confidence: 96%

“…Finally, it should be noted that higher joint efficiencies can be achieved via designing a proper post-bond heat treatment to improve the homogenisation across the bond region via enhancing the interdiffusion of alloying elements particularly Nb, Cr and Mo and eliminating the boride precipitates in DAZ. This issue has been addressed elsewhere 25 .…”

Section: Final Remarksmentioning

confidence: 99%

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Solid solution strengthening of transient liquid phase bonded nickel based superalloy

Pouranvari

2015

Materials Science and Technology

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This paper aims at probing and quantifying the effect of filler alloy chemistry on solid solution strengthening mechanism of transient liquid phase bonded of a cast Ni-Fe-Nb based superalloy. Bonding was performed using three different nickel based filler alloys including Ni-4?5Si-3?2B, Ni-7Cr-4?5Si-3?2B-3Fe and Ni-15?2Cr-4B. The hardness of isothermal solidification zone was proved to be the controlling factor for the shear strength of the joints. It is concluded that the initial chromium content of the filler alloy and the extent of base metal dissolution, which in turn is controlled by the initial boron content of the filler alloy, play important roles in strengthening of the isothermal solidification zone. Bonding using Ni-15?2Cr-4B resulted in eutectic free joint with the highest shear strength.

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Section: Resultsmentioning

confidence: 96%

Section: Final Remarksmentioning

confidence: 99%

Solid solution strengthening of transient liquid phase bonded nickel based superalloy

Pouranvari

2015

Materials Science and Technology

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“…Some researchers have realized transient liquid phase (TLP) bonding by adding a nickel-based foil interlayer between welding materials. This method can reduce the bonding temperature and bonding pressure of diffusion bonding under the condition of ensuring the strength, and it can also relieve the deformation degree of the parts [2][3][4]8,9]. However, the enhanced fluidity of the intermediate layer material in liquid phase will also block and destroy the microchannel inside the porous lattice structure during TLP bonding.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Tensile Strength and Deformation of Diffusion Bonding Joint for Inconel 718 Using Deep Neural Network

Mei

Lang

et al. 2020

Metals

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Due to the acceptable high-temperature deformation resistance of Inconel 718, its welding parameters such as bonding temperature and pressure are inevitably higher than those of general metals. As a result of the existing punitive processing environment, it is essential to control the deformation of parts while ensuring the bonding performance. In this research, diffusion bonding experiments based on the Taguchi method (TM) are conducted, and the uniaxial tensile strength and deformation ratio of the experimental joints are measured. According to experimental data, a deep neural network (DNN) was trained to characterize the nonlinear relationship between the diffusion bonding process parameters and the diffusion bonding strength and deformation ratio, where the overall correlation coefficient came out to be 0.99913. The double-factors analysis of bonding temperature–bonding pressure based on the prediction results of the DNN shows that the temperature increment of the diffusion bonding of Inconel 718 significantly increases the deformation ratio of the diffusion bonding joints. Therefore, during the multi-objective optimization of the bonding performance and deformation of components, priority should be given to optimizing the bonding pressure and duration only.

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“…19 Since the solid and liquid are in an equilibrium condition during isothermal solidification, the secondary phases cannot form at this stage. 3,20 The solidification behavior of the remaining liquid during the TLP bonding of pure nickel using the Ni-Cr-B interlayer, before completion of the isothermal solidification, was modeled by K. Ohsasa et al 21 The ternary phase diagram of Ni-Cr-B, in which the chemical composition of the interlayer is specified, is shown in Figure 3. 22 During the cooling of the remaining liquid, which is the main driving force for ASZ solidification, g dendrite is the first phase that forms at 1100°C 21 and grows from the solid/liquid interface towards the joint centerline.…”

Section: Microstructure Of the Jointmentioning

confidence: 99%

“…Also, this alloy has outstanding strength accompanied by excellent creep, fatigue, oxidation and corrosion resistance at high temperatures. [2][3][4] Nimonic 75 is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon. Nimonic 75 first introduced in the 1940s for turbine blades as sealing components and is now mostly used for sheet applications calling for oxidation and scaling resistance coupled with medium strength at high operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution during the transient liquid-phase bonding of dissimilar nickel-based superalloys of IN738LC and NIMONIC 75

Ghomi¹,

Nategh²,

Mirdamadi³

2016

Mater. Tehnol.

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The joining of dissimilar nickel-based superalloys, i.e., IN738LC to Nimonic 75, using transient liquid-phase bonding with a Ni-15Cr-3.5B interlayer (MBF-80) was carried out at temperatures of 1080°C to 1180°C for different bonding times of 30-150 min. A joint cross-section was surveyed using optical and scanning electron microscopy. Microstructural examinations showed that after short bonding times, the joint microstructure consists of continuous eutectic intermetallic phases and longer bonding times lead to a eutectic-free microstructure. It was clear that for all the bonding times and temperatures, boride phases were precipitated at the interface of the base metal and the interlayer due to boron diffusion in to the base metals. The results also showed that the morphology of the precipitates in the diffusion-affected zone (DAZ) varies from globular to acicular by increasing the bonding time. Completion of the isothermal solidification, which prevents the formation of continuous intermetallic phases at the joint centerline, was studied at different temperatures. Keywords: IN738LC, Nimonic 75 superalloy, TLP bonding, isothermal solidification, microstructure Spajanje razli~nih superzlitin na osnovi niklja IN738LC na Nimonic 75, z uporabo prehodno teko~e faze z vmesnim slojem Ni-15Cr-3,5B (MBF-80), je bilo izvedeno pri temperaturah od 1080°C do 1180°C in pri razli~nih~asih spajanja od 30 min do 150 min. Pre~ni prerez spoja je bil pregledan s svetlobno in z vrsti~no elektronsko mikroskopijo. Mikrostrukturne preiskave so pokazale, da pri kratkih~asih spajanja mikrostruktura sestoji iz zvezne evtekti~ne intermetalne faze, dolgi~asi spajanja pa povzro~ijo mikrostrukturo brez evtektika. Izkazalo se je, da se pri vseh~asih in temperaturah spajanja, boridna faza zaradi difuzije bora izlo~a na meji z osnovnim materialom v osnovni material. Rezultati so tudi pokazali, da morfologija izlo~kov v difuzijsko vplivani coni (DAZ) z nara{~anjem~asa spajanja varira, od globularne do acikularne. Dokon~anje izotermnega strjevanja, ki prepre~i nastanek zvezne intermetalne faze na liniji spajanja, je bilo prou~evano pri razli~nih temperaturah.

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Aging response of transient liquid phase bonded wrought IN718 superalloy: influence of post-bond heat treatment

Cited by 27 publications

References 31 publications

Solid solution strengthening of transient liquid phase bonded nickel based superalloy

Solid solution strengthening of transient liquid phase bonded nickel based superalloy

Prediction of Tensile Strength and Deformation of Diffusion Bonding Joint for Inconel 718 Using Deep Neural Network

Microstructural evolution during the transient liquid-phase bonding of dissimilar nickel-based superalloys of IN738LC and NIMONIC 75

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