The joint properties of a high-chromium Ni-based superalloy made by diffusion brazing: Microstructural evolution, corrosion resistance and mechanical behavior

Arhami, Farzam; Sadeghian, Amirhossein; Johar, M.H.

doi:10.1016/j.jmapro.2018.11.025

Cited by 45 publications

(9 citation statements)

References 36 publications

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“…Furthermore, the fabrication of the primary gamma as a pro-eutectic phase results in the emission of dissolved elements like boron, titanium, niobium, tungsten, and tantalum in the liquid phase. Primary-gamma growth is associated with dendritic morphology in these elements, which have a distribution coefficient of less than one [8,14,20]. Also, the maximum solubility of B in Ni occurs at 1087 • C (0.3 at.%).…”

Section: Resultsmentioning

confidence: 99%

“…Transient liquid phase (TLP) bonding or diffusion brazing is another important diffusion-based method that differs from solid-state joining due to inserting a thin third interlayer between the base metals [14]. This thin interlayer, which usually has a lower melting point than the base material, causes a phase change within the joint area and the formation of a liquid phase.…”

Section: Introductionmentioning

confidence: 99%

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"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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Section: Resultsmentioning

confidence: 99%

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 the case of nickel-based alloys, when applying BNi-9 foils, different times have been reported, depending on the weld material and foil thickness where the filler has already solidified. Bai et al [8] reported 6 min with a 40-µm-thick foil applied to IN 718; Arham et al [9] reported 90 min to solidify a 75-µm foil in IN 939; Wikstrom et al [10] and Tokoro et al [11] reported 360 min to solidify a 100-µm foil in Waspaloy; and Bakhtiari et al [16] reported 5 min to solidify a 50-µm-thick foil in a base cobalt alloy FSX-414.…”

Section: Base Alloy Alloys Filler Metal Thickness Brazing Microstrucmentioning

confidence: 99%

Metallurgical Interaction among BNi-9 and Waspaloy, FSX-414 or 304-Type Stainless Steel under TLP Cycle

Flores-Escareño

Castro‐Román

Hernández-García³

et al. 2020

Metals

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The metallurgical interaction of BNi-9 filler metal paste with Waspaloy, Ni-coated Waspaloy, FSX-414, and 304-SS is studied in a brazing treatment under an argon atmosphere with an isothermal hold for one hour at 1150 °C. The Waspaloy alloys were brazed under both solubilized and aging conditions. Before brazing, some Waspaloy samples were electrochemically coated with an Ni layer 35-40 μm thick. The microstructures of the FSX-414 and 304-SS alloys showed that the thickness of the isothermal solidification zones was approximately 50 μm, while this thickness was not well defined in the Waspaloy samples. The Ni-coated solubilized Waspaloy showed a wider diffusive zone, which was associated with an increase in the penetration extension of the liquid films. The analysis of grain orientation in all brazed zones of the Waspaloy samples showed aleatory characteristics. Plastic factors in the different brazed zones were also obtained by nanoindentation under 350 mN loads. It was observed that the plastic factor was low when the width of the diffusive zone increased. The plastic factor in the Ni-coated Waspaloy was the lowest, while the diffusive zone in this sample had the largest width. The BNi-9 wettability is better in FSX-414, and 304-SS than in Waspaloy. Ni coating in Waspaloy improves BNi-9 wettability.

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“…However, they cause the formation of brittle phases in the joints as well, which have a detrimental effect on their mechanical properties (see overviews [ 1 , 2 ], for instance). An analysis of the relationship between the structure of joints brazed with Ni-Cr BFMs and their properties is presented in papers [ 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Structural Components in Hastelloy X Joints Brazed with Ni-Pd-Cr-B-Si Alloy

Baranowski

Senkara

2023

Materials

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The brazing of structural high-temperature-resistant nickel alloys is a predominant method in manufacturing jet engines in the aircraft industry. Ni-Cr-base brazing filler metals (BFMs) containing B and Si as the melting point depressants are used for this purpose. The presence of the latter can lead to the formation of brittle constituents in the joints, decreasing their strength, toughness and creep resistance. The structures of Hastelloy X nickel superalloy joints brazed with Palnicro 36M BFM are presented in this paper along with the mechanical properties of their particular phases as a function of brazing time. Indentation hardness, Martens hardness, reduced modulus and creep coefficient were measured using the instrumented indentation method. The elastic part of the indentation work was also calculated. Pd forms an unlimited solution with Ni, but its high content in BFM does not fundamentally change the general joint structure known from other Ni-superalloy–Ni-BFM systems. However, new Pd-containing phases are emerging. The hardest components were Ni-B and Cr-B boride phases and Pd-Ni-Si phase in MZ and the boundary of DAZ and BM. MZ reduces the plasticity of a joint to the highest extent. The hardness of particular parts in the joints and the elastic portion of the indentation work decreased with the increase in brazing time, while the reduced modulus of the indentation contact and indentation creep increased. The results of indentation creep measurements indicate that all structural components of the joints were less susceptible to creep than the parent material at room temperature.

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The joint properties of a high-chromium Ni-based superalloy made by diffusion brazing: Microstructural evolution, corrosion resistance and mechanical behavior

Cited by 45 publications

References 36 publications

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

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

Metallurgical Interaction among BNi-9 and Waspaloy, FSX-414 or 304-Type Stainless Steel under TLP Cycle

Mechanical Properties of Structural Components in Hastelloy X Joints Brazed with Ni-Pd-Cr-B-Si Alloy

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