Effect of bonding time on microstructure and mechanical properties of diffusion brazed IN-939

Arhami, Farzam; Sadeghian, Amirhossein

doi:10.1016/j.jmatprotec.2018.10.021

Cited by 42 publications

(13 citation statements)

References 35 publications

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“…Herein, the solid/liquid interface moved towards the BM and the melting point depressants (MPD) elements (B and Si) diffused into the BM, increasing the melting point of the liquid. Once the melting point of the liquid filler metal increases to the bonding temperature (1230 • C), the solid/liquid boundary reaches a transient state of equilibrium [31,35,36]. The content of Ta, Re, W, and Al in the BM is higher than the original filler metal, which continues to increase in the liquid state.…”

Section: Microstructure Of the As-prepared Jointmentioning

confidence: 99%

“…One should note that the PBHT is a promising route to remove the brittle phases and improve the mechanical properties. Nevertheless, previous studies were mainly focused on the shear strength [28,[31][32][33][34] and a few studies focused on the effect of microstructural evolution and creep behavior of the joint. The creep life is an important performance index because the failure of components is usually induced by long-lasting stress.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Post-Bond Heat Treatment on Microstructure and Creep Behavior of the Brazed Single-Crystal Nickel Superalloy

et al. 2022

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Post-bond heat treatment (PBHT) is an effective way to improve the bonding quality of a brazed joint. Herein, brazing of a nickel-based single crystal superalloy is carried out using a Ni-Cr-Co-B-Si-Al-Ti-W-Mo filler alloy, and the microstructure and creep property of the brazed joint are systematically investigated using scanning electron microscopy (SEM), Thermo-Calc software, an electron probe micro-analyzer (EPMA), X-ray diffractometer, confocal scanning laser microscope (CSLM), and transmission electron microscopy (TEM). The results reveal that the as-prepared joint only consists of an isothermally solidified zone (ISZ) and an athermally solidified zone (ASZ), where the cubic γ′ phase is observed in the ISZ, and skeleton-like M3B2, γ + γ′ eutectic and reticular G phases are observed in the ASZ. Furthermore, the γ + γ′ eutectic and G phases disappear and the M3B2 alters from a skeleton-like to block-like shape in the ASZ after PBHT. Meanwhile, some lath-like M3B2 phases are precipitated at the edge of the ISZ and several M3B2 phases are precipitated in the base metal, forming a new zone in the brazed joint, namely at the diffusion affected zone (DAZ). Owing to the removal of low melting point eutectics from the as-prepared joint, the creep life also increases from 188 h to 243 h after PBHT. The current work provides a method for the optimization of brazed joints based on the Ni-based single crystal superalloy.

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Section: Microstructure Of the As-prepared Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Post-Bond Heat Treatment on Microstructure and Creep Behavior of the Brazed Single-Crystal Nickel Superalloy

et al. 2022

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“…In recent past, several studies have been performed on dissimilar and similar TLP bonding of a wide range of nickel-based superalloys, such as DZ483 [21], Inconel 600 [22], Inconel 617 [9], Inconel 625 [23], Inconel 713C, Inconel 718 [19,24], Inconel 738 [25] and Inconel 939 [26]. Recently, results of combined analytical [27] and numerical simulation [28] and experimental investigation on IN 718 and other Ni-based superalloys have also been reported [16].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, results of combined analytical [27] and numerical simulation [28] and experimental investigation on IN 718 and other Ni-based superalloys have also been reported [16]. The reported investigations related to the IN 718 TLP bonding were mainly focused on the microstructure of the bonds made by only BNi-2 or BNi-3 as interlayer materials [15,16,26]. There is a need to develop new filler materials for joining, thereby facilitating the components to withstand still higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Ni–Cr–Si–B–Fe Based Interlayer Material and Its Application in TLP Bonding of IN 718 Superalloy

Tarai

Robi

Pal

2020

Acta Metall. Sin. (Engl. Lett.)

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A new Ni-Cr-Si-B-Fe filler material is prepared for transient liquid-phase (TLP) bonding of Inconel 718 superalloy by mechanical alloying technique. The melting temperature range of the filler material and its activation energy of melting are determined by differential scanning calorimetry technique. The activation energy and melting temperature of the alloy powder decrease with increasing milling time. Inconel 718 alloy was joined via TLP by using the newly developed filler material. The effect of TLP bonding temperature and time on microstructural evolution and mechanical properties of the joint was investigated. Three distinct microstructural regions were observed in the bonding area: isothermal solidification zone consisting of a single-phase solid solution, diffusion affected zone consisting of extensive diffusion-induced precipitates of metallic boride, and unaffected base material. The ultimate shear strength and microhardness of the TLP-bonded joint increase with bonding time and temperature.

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“…In recent years, this issue has been addressed using transient liquid phase (TLP) bonding [ 5 ], which is an excellent brazing technique with a filler metal based on eutectic transformations. Since this technique is more efficient and cost-effective compared to other repair techniques, it has been used for bonding aerospace components and repairing cracks [ 6 , 7 , 8 ]. However, due to the complete melting of the filler metal and the formation of a brittle eutectic structure, it is limited to gaps smaller than 1.5 mm [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Wide-Gap Brazing of K417G Alloy Assisted by In Situ Precipitation of M3B2 Boride Particles

Zhang

et al. 2020

Materials

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In this study, K417G Ni-based superalloy with a 20-mm gap was successfully bonded at 1200 °C using powder metallurgy with a powder mixture. The results indicated that the microstructure and mechanical properties of the as-bonded alloy were highly dependent on the brazing time (15–45 min), mainly due to the precipitation and distribution characteristics of M3B2 boride particles. Specifically, alloy brazed for 30 min exhibited desirable mechanical properties, such as a high tensile ultimate strength of 971 MPa and an elongation at fracture of 6.5% at room temperature, exceeding the balance value (935 MPa) of the base metal. The excellent strength and plasticity were mainly due to coherent strengthening and dispersion strengthening of the in situ spherical and equiaxed M3B2 boride particles in the γ + γ′ matrix. In addition, the disappearance of dendrites and the homogenization of the microstructure are other factors that cannot be excluded. This powder metallurgy technique, which can avoid the eutectic transformation of traditional brazing, provides a new effective method for wide-gap repair of alloy materials.

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Effect of bonding time on microstructure and mechanical properties of diffusion brazed IN-939

Cited by 42 publications

References 35 publications

Influence of Post-Bond Heat Treatment on Microstructure and Creep Behavior of the Brazed Single-Crystal Nickel Superalloy

Influence of Post-Bond Heat Treatment on Microstructure and Creep Behavior of the Brazed Single-Crystal Nickel Superalloy

Thermal Properties of Ni–Cr–Si–B–Fe Based Interlayer Material and Its Application in TLP Bonding of IN 718 Superalloy

Wide-Gap Brazing of K417G Alloy Assisted by In Situ Precipitation of M3B2 Boride Particles

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