Microstructural Evolution and Mechanical Properties Evaluation of IN-939 Bonds Made by Isothermal Solidification of a Liquated Ni-Cr-B Interlayer

Arhami, Farzam

doi:10.1007/s11661-018-4918-3

Cited by 19 publications

(5 citation statements)

References 44 publications

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“…BNi 3 + c binary eutectic in the athermal solidification zone has been observed during the TLP process at 1120°C using Ni-Cr-B as the filler metal. [30] From the data presented in Table II, it is evident that about 3.8 at. pct Si can be dissolved in the c solid solution (c-ISR).…”

Section: ! L þ C ½1mentioning

confidence: 94%

Wide Gap Brazing of Inconel 738LC Nickel-Based Superalloy: Metallurgical and Mechanical Characteristics

Alinaghian

Farzadi

Marashi

et al. 2020

Metall Mater Trans A

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This paper addresses the microstructure properties relationship of wide gap brazed Inconel 738LC. Amdry 718 and a Ni-Cr-Fe-Si-B alloy were used as high melting particles (HMPs) and low melting particles (LMPs), respectively. The effect of the amount of LMPs, 30, 40, and 50 pct, on the microstructure and the shear strength of the joint, was investigated. The microstructure in the brazing zone consists of Ni-based solid solution and eutectic-type microconstituents that is nickel-rich and chromium-rich borides. Nickel-rich borides only observed in the presence of the high amount of LMPs, because of the low Cr-B ratio in the filler alloy. At the brazing/base metal interface, high diffusion of melting point depressant (MPD) elements to the base metal led to the formation of small blocky Cr-rich borides in Ni-rich solid solution matrix. The nickel-rich and chromium-rich borides have a hardness value of about 1200 and 830 HV, respectively, which is remarkably higher than the other regions. By increasing the amount of LMPs from 30 to 50 pct, the joint shear strength decreases from 422 to 373 MPa due to the higher volume fraction of the brittle boride phase in the joint. For all brazed joints, the cleavage fracture mode was observed, which can be ascribed to the interlinked network of the brittle eutectic-type microconstituents. The X-ray diffraction pattern confirms that the preferred location for crack propagation is eutectic boride phases.

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Section: ! L þ C ½1mentioning

confidence: 94%

Wide Gap Brazing of Inconel 738LC Nickel-Based Superalloy: Metallurgical and Mechanical Characteristics

Alinaghian

Farzadi

Marashi

et al. 2020

Metall Mater Trans A

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“…But, in some reports, the application of pressure was necessary to improve bonding. Hence, using the mentioned holding fixture, a pressure of 10 MPa was applied for this experiment [19].…”

Section: Methodsmentioning

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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“…This is called isothermal solidification, which is more convenient than solidification by cooling [11,12,21,[13][14][15][16][17][18][19][20]. In previous studies, similar and dissimilar TLP bonding of several Ni-based superalloys such as IN-617 [22][23][24][25], IN-939 [16,[26][27][28],…”

Section: Introductionmentioning

confidence: 99%

Dissimilar transient liquid phase bonding of Ti-6Al-4V alloy to Inconel 625 superalloy: effect of bonding temperature on microstructural evolutions and mechanical properties

Zorriatolhosseini,

Mirsalehi,

Shamsi

2024

Weld World

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Microstructural Evolution and Mechanical Properties Evaluation of IN-939 Bonds Made by Isothermal Solidification of a Liquated Ni-Cr-B Interlayer

Cited by 19 publications

References 44 publications

Wide Gap Brazing of Inconel 738LC Nickel-Based Superalloy: Metallurgical and Mechanical Characteristics

Wide Gap Brazing of Inconel 738LC Nickel-Based Superalloy: Metallurgical and Mechanical Characteristics

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

Dissimilar transient liquid phase bonding of Ti-6Al-4V alloy to Inconel 625 superalloy: effect of bonding temperature on microstructural evolutions and mechanical properties

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