Influence of bonding time on the transient liquid phase bonding behavior of Hastelloy X using Ni-Cr-B-Si-Fe filler alloy

Malekan, A.; Farvizi, M.; Mirsalehi, Seyyed Ehsan; Saito, Noritaka; Nakashima, Kouichi

doi:10.1016/j.msea.2019.03.124

Cited by 49 publications

(10 citation statements)

References 35 publications

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“…When the brazing time is 15 min, the M 3 B 2 phase mainly distributed along the boundary of dendrites with chain-type shape; this may be due to the presence of higher energy in the dendrite boundary, which provides a good dynamic foundation for the precipitation of M 3 B 2 boride [ 30 , 31 ].…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Nickel-based superalloys are broadly utilized in various sectors, especially in the aerospace and energy industries, because of their outstanding resistance to oxidation and significant creep behavior at high temperatures [1][2][3]. Among them, cast nickel-based high--chromium superalloys such as Inconel 939 (IN-939) have received much attention in different industries, such as aircraft components, chemical plant equipment, and petrochemical equipment, because of their extraordinary resistance to hot corrosion and oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, cast nickel-based high--chromium superalloys such as Inconel 939 (IN-939) have received much attention in different industries, such as aircraft components, chemical plant equipment, and petrochemical equipment, because of their extraordinary resistance to hot corrosion and oxidation. Considering the significant amounts of gammaprime (γ ) precipitates like aluminum and titanium presented in their chemical composition, this superalloy is strengthened by the distribution of gammaprime precipitates gamma solid-solution matrix [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

"Investigation of microstructure evolution of Inconel 939 joint diffusion brazed using an amorphous liquated Ni-Cr-Fe-Si-B interlayer "

Tazikeh¹,

Mirsalehi²

2022

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In this study, IN-939 high-chromium nickel-based superalloy was diffusion brazed using an amorphous Ni-Cr-Fe-Si-B foil as an interlayer and under high vacuum conditions. A successful joint was obtained at the applied temperature and bonding time of 1120 • C and 45 min. The microstructural evolution of the joint area was also investigated. The phases formed through the bonding process were categorized into three distinguished zones: isothermally solidified, athermally solidified, and diffusion-affected zones. According to the results, a gamma solid--solution single-phase was produced in the centerline of the joint. Also, some precipitates with blockage and Widmanstatten morphologies were observed in the diffusion-affected area that appears to be Cr-rich borides. Chromium depletion occurred in the gamma matrix adjacent to these precipitates. In addition, the number of precipitates decreased, moving away from the interface of the isothermally solidified zone towards the base metal. The highest and lowest microhardness values were obtained for the DAZ and ISZ, respectively. The precipitation of hard Cr-rich boride particles in the DAZ and the absence of a second phase in the ISZ microstructure were probably responsible for this difference in the hardness.

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“…Repairing nickel-based superalloys by conventional repair methods such as fusion welding is usually not recommended as it is prone to physical and mechanical degradation due to fusion zone susceptibility and heat-affected zone cracking [5][6][7]. For this, the diffusion brazing method (also known as transient liquid phase bonding) has been widely used for nickel-based superalloy repairs [8][9][10]. It is a method of using brazing or filler alloy that contains melting point depressants such as silicon, boron and phosphorus to lower the bonding liquidus temperature.…”

Section: Introductionmentioning

confidence: 99%

Induction Brazing for Rapid Localized Repair of Inconel 718

Aprilia

Tan

Yang

et al. 2021

Metals

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Vacuum furnace has been used for brazing repair of aerospace components, but it is a slow process which typically takes a few hours. The prolonged heating and cooling cycles could cause some adverse effects on the components such as excessive grain growth. A rapid brazing technique using induction coil was studied to evaluate its suitability for localized repair. Induction brazing of Inconel 718 was carried out using AMS 4777 brazing paste at different temperatures (950 °C, 1050 °C and 1150 °C ) for various durations (2 min, 10 min and 20 min). Microstructure and microhardness were evaluated. The experimental results show that brazing at 1050 °C leads to desirable microstructures in a short period of merely 2 min. The study demonstrates the potential application of induction brazing for rapid localized aerospace repair.

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Influence of bonding time on the transient liquid phase bonding behavior of Hastelloy X using Ni-Cr-B-Si-Fe filler alloy

Cited by 49 publications

References 35 publications

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

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

"Investigation of microstructure evolution of Inconel 939 joint diffusion brazed using an amorphous liquated Ni-Cr-Fe-Si-B interlayer "

Induction Brazing for Rapid Localized Repair of Inconel 718

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