Effect of Tungsten Addition on the Nucleation of Borides in Wide Gap Brazed Joint

McGuire, Daniel; Huang, Xiao; Nagy, Doug; Chen, Weijie

doi:10.1115/1.4000136

Cited by 16 publications

(4 citation statements)

References 8 publications

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“…In addition, the pre-filling of the alloy powder did transform the morphology of the low-melting point phases from large blocky shaped and skeletal shaped to small blocky shaped or dot shaped that were dispersed throughout the brazed joint. In conclusion, the alloy powder performed three basic functions: (1) to provide capillary pressure to draw molten brazing alloy into the microgaps, (2) to act as a boron or silicon sink, and (3) to present opportunities for further alloying metals to the repaired region [16,17]. Therefore, in the study, it was proved that the pre-filling of the alloy powder selected in the paper did improve the microstructure and high-temperature tensile strength of the wide gap brazed joint of K465 superalloy.…”

Section: High-temperature Tensile Test Results and Comparison Of Low-mentioning

confidence: 99%

The microstructures and mechanical properties of K465 superalloy joints, brazed with different clearances

et al. 2015

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K465 superalloy was brazed with brazing clearance of 0.1 and 0.5 mm, respectively. The microstructures of the brazed joints were observed, and compositions of typical microzones were analyzed by means of scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and electron probe microanalysis (EPMA). In addition, hightemperature tensile tests for the brazed joints were also conducted. The results showed that for the brazed joints with 0.1 mm clearance, the low-melting phases such as the white blocky shaped (W, Cr)B boride phases and gray skeletal phases M 3 B 2 boride phases were mainly precipitated in the central region of the brazed seam. However, the microstructure of the brazed joints with 0.5 mm clearance, which was pre-filled fully with one type of Ni-based alloy powder prior to brazing, was remarkably improved. Compared to the brazed joints with 0.1 mm clearance, the pre-filling of the alloy powder changed the distribution and morphology of low-melting phases, which was favorable to the improvement in hightemperature tensile properties of the brazed joints with 0.5 mm clearance. At 900°C, the average tensile strength of the brazed joints with 0.1 mm clearance was only 488 MPa, while the average tensile strength of the brazed joints with 0.5 mm clearance increased to 615 MPa, which is 75 % of the K465 base metal tensile strength.

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Section: High-temperature Tensile Test Results and Comparison Of Low-mentioning

confidence: 99%

The microstructures and mechanical properties of K465 superalloy joints, brazed with different clearances

et al. 2015

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“…Siwanart KHUMHAENG*, Thitapa SUKSA*, Nutcha LAOHALERTCHAI*, Benyapa CHAIPRASIT*, Prasert PRAPAMONTHON* and Bo YIN** the literature (McGraw et al, 2006;Guerreschi et al, 1995;Mishra et al, 2017;Vaferi et al, 2019;Ellison et al, 1992;Duvall and Doyle, 1973;McGuire et al, 2010). For example, (Mishra et al, 2017) investigated the failure of an uncooled turbine aero gas-turbine blade.…”

Section: Numerical Investigation Of Effects Of Damaged and Repaired S...mentioning

confidence: 99%

Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge

KHUMHAENG,

SUKSA,

LAOHALERTCHAI

et al. 2024

JFST

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The nozzle guide vane, which is a stationary part of a gas turbine, is a critical component of gas turbine engines because it must operate under harsh conditions with high pressure and temperature. Unfortunately, when a gas turbine runs for a long time, the turbine vane is subjected to repeated thermal load. This increases the possibility of fatigue damage and crack failure, thereby reducing the vane material's lifespan. In practice, the risk of failure at the trailing edge (TE) of a turbine vane is very high due to the reasons of shape configuration and cooling performance. The TE damage disturbs the flow physics of compressible air passing the vane TE, resulting in flow phenomena and heat convection. The study aims to numerically investigate the effects of damaged surfaces at the TE of a turbine vane on its flow behavior using computational fluid dynamics (CFD) with the SST k-w turbulence model. To simplify the simulation, the effects of the TE failure are presented by using two basic patterns, i.e., long (continuous) cutback damage, and two-short (discrete) cutback damage. To complete the investigation, a further study on the effects of repaired surfaces is included as well. The numerical results show the effects of damaged and repaired surfaces on flow behavior, particularly the vortex formation and the level of turbulent kinetic energy (TKE) in the TE region. Specifically, the damaged vane surface significantly increases the TKE level in the TE region, particularly the two-short damaged surface, which TKE shoots up to 7000-8000 m 2 /s 2 . Meanwhile, TKE in the normal and long damaged case is around 1500 and 4000 m 2 /s 2 . With the restoration of the vane surfaces, it can reduce the TKE level in the TE region. For instance, TKE is uniformly around 1750 m 2 /s 2 for the long repaired surface.

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“…nickel-boron) and the additive metal (of similar composition to the metal being joined, usually a superalloy), possibly with a binder. The additive metal acts to 1) partially fill the void space; 2) provide an accessible sink for the melting point suppressants to diffuse into, 3) create narrow gaps within the joint, which are penetrated by the filler metal by capillary action and 4) permit alloy composition adjustment in the joint region [183]. The brazing thermal treatment melts the filler metal which interacts with the joint surfaces and the additive metal powder, allowing the boron to diffuse away from the filler, and give a high temperature joint.…”

Section: Wide Gap Brazingmentioning

confidence: 99%

Brazing filler metals

Way

Willingham

Goodall

2019

International Materials Reviews

104

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Brazing is a 5000-year-old joining process which still meets advanced joining challenges today. In brazing, components are joined by heating above the melting point of a filler metal placed between them; on solidification a joint is formed. It provides unique advantages over other joining methods, including the ability to join dissimilar material combinations (including metal-ceramic joints), with limited microstructural evolution; producing joints of relatively high strength which are often electrically and thermally conductive. Current interest in brazing is widespread with filler metal development key to enabling a range of future technologies including; fusion energy, Solid Oxide Fuel Cells and nanoelectronics, whilst also assisting the advancement of established fields, such as automotive lightweighting, by tackling the challenges associated with joining aluminium to steels. This review discusses the theory and practice of brazing, with particular reference to filler metals, and covers progress in, and opportunities for, advanced filler metal development.

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Effect of Tungsten Addition on the Nucleation of Borides in Wide Gap Brazed Joint

Cited by 16 publications

References 8 publications

The microstructures and mechanical properties of K465 superalloy joints, brazed with different clearances

The microstructures and mechanical properties of K465 superalloy joints, brazed with different clearances

Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge

Brazing filler metals

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