Intermetallic phase formation during brazing of a nickel alloy using a Ni–Cr–Si–Fe–B quinary filler alloy

Ghasemi, Ali; Pouranvari, M.

doi:10.1080/13621718.2018.1553280

Cited by 37 publications

(21 citation statements)

References 38 publications

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“…On the other hand, to ensure that the melting of the filler was completed and to have proper fluidity, the brazing temperature had to be about 20°C higher than the temperature of filler liquidus. According to these points, therefore, the desired temperature difference between liquidus filler and solidus base metal had to be close to 40°C [15][16][17].…”

Section: Resultsmentioning

confidence: 99%

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Preparation and characterisation of nickel-based brazing powder: cobalt and chromium addition effects

2022

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In the present work, three novel brazing powders were produced, in addition to a commercial composition, by the mechanical alloying (MA) method. Cobalt and chromium's effects on the properties of brazing powder and related joints were investigated. The results showed that; with the addition of cobalt, the powder morphology went to a rounded and near-spherical shape after 15 milling hours, and the solidus significantly raised. Also, chromium shifted the melting range to higher temperatures. The powder with 6% cobalt and 14% chromium had more than 100°C higher solidus and a melting range of 20°C than the commercial BNi-2, ideal for working temperature of more than 1000°C. The shear strength results revealed that the addition of chromium and cobalt significantly promotes joint strength owing to the activation of the solid solution strengthening mechanism. Therefore, the novel synthesized brazing powders can be an excellent candidate for high temperature and corrosive operating environments.

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Section: Resultsmentioning

confidence: 99%

“…In Figure 10(a) and Table 5, for MBN at a temperature of 1066°C, a very sharp endothermic interaction was formed, which indicated the beginning of the melting point or solidus point. On the other hand, at the point of 1122.5°C, this endothermic peak ended, which means the end of the melting point or the liquidus point [15–17].…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterisation of nickel-based brazing powder: cobalt and chromium addition effects

2022

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“…The mechanism of joint formation is complex and the duration of its particular stages may vary depending on the time of the process. It has been the subject of a number of studies, especially for the most commonly used BNi2 and BNi3 [ 7 , 8 , 9 , 10 , 11 , 12 ], and other BFMs based on Cr-Ni [ 13 , 14 , 15 ]. There is an agreement that, in general, the BFMs in question create the joint structures in which three main zones can be distinguished.…”

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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“…Brazing [4][5][6][7][8][9][10] and transient liquid phase bonding [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] are attractive for joining Ni-based superalloys. For example, Luo et al used a BNi-2 filler metal to join Hastelloy C-276 (UNS N10276) [7].…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Diffusion-Welded Alloy 617

Sah

Hwang

Kim

2021

Metals

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Plate-type heat exchangers are anticipated to be used in the next-generation nuclear industry, and solid-state diffusion welding is a critical technology for building plate-type heat exchangers with high integrity. In this study, we manufactured a diffusion weldment and evaluated its creep behavior. Microscopic analysis revealed that Al-rich oxides were developed along the interface, significantly impeding grain-boundary movement across the interface. Oxide-containing planar grain boundaries resulted in premature brittle fracture at the interface with less than 9% creep strain under all test conditions. The time to rupture and time to 1% creep strain of the diffusion weldment were less than those of the as-received alloy, while the slopes in double-logarithmic plots were almost identical for both alloys. In a Larson–Miller parameter study, the stress to rupture of the diffusion weldment reached 95.59% of that of the as-received alloy, whereas the stress to 1% creep strain steeply decreased in the low-stress range.

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Intermetallic phase formation during brazing of a nickel alloy using a Ni–Cr–Si–Fe–B quinary filler alloy

Cited by 37 publications

References 38 publications

Preparation and characterisation of nickel-based brazing powder: cobalt and chromium addition effects

Preparation and characterisation of nickel-based brazing powder: cobalt and chromium addition effects

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

Creep Behavior of Diffusion-Welded Alloy 617

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