Special features of diffusion welding of EP975 creep-resisting alloy and VKNA-4U cast single-crystal intermetallic alloy for blisk structures

Lukin, V. I.; Rylnikov, V.S.; Afanasyev-Khodykin, A.N.; Timofeyeva, O.B.

doi:10.1080/09507116.2013.840043

Cited by 5 publications

(1 citation statement)

References 1 publication

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“…Promising materials used to create heat-shielding systems are multicomponent powder materials based on (Ni-Cr), in particular, a five-component powder composite material consisting of metallic (Ni-Cr), intermetallic (Al-Ni 3 ) and oxide (Y 2 O 3 ) phases. However, its application, despite numerous advantages, is difficult due to the exceptional complexity of welding or brazing [3,4] of non-rigid thin structural elements.…”

Section: Introductionmentioning

confidence: 99%

About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials

et al. 2021

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The results of studying the process of laser vacuum welding of elements of heat-shielding panels made of heat-resistant dispersion-strengthened powder materials Ni-20Cr-6Al-Ti-Y2O3 of increased strength are presented. Such materials can be used to create ultralight heat-shielding panels, which are systems integrated on the surface of aircraft from typical modules of a cellular structure. Technical solutions of heat-insulating modules are considered, which are a cellular (honeycomb) structure consisting of two plates with a thickness of 0.1 to 0.14 mm, inside which there is a thin honeycomb filler. It is shown that the small thickness of the plates and the complexity of integrating the elements into a single system significantly impair the formation of a strong connection of such elements and do not allow the direct use of the known methods of diffusion welding or vacuum brazing. It has been established that laser welding of elements of heat-shielding structures in vacuum provides satisfactory strength of the structure of the heat-shielding element as a whole. Local heating at certain points prevents deformation of the parts to be joined during the welding process. The use of a pulsed Nd:Yag laser with a power of 400–500 W, operating in the frequency range of 50–200 Hz, allows welding with or without a filler powder. It was found that the use of filler additives practically does not affect the mechanical properties of the welded joint, however, it reduces the melt zone, while increasing the density of the welded joint. Based on the results obtained, it was concluded that it is possible to use laser vacuum welding for the integration of thin elements of heat-shielding modules. It is shown that a satisfactory joint strength is achieved by ensuring high cleanliness of the surfaces of elements before welding, maintaining a high vacuum (less than 10–2 Pa) and rational thermal loading of the surfaces of the elements to be integrated. The use of the proposed process makes it possible to obtain a stronger and denser seam in comparison with the known methods of soldering multicomponent powder dispersion-strengthened materials

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Section: Introductionmentioning

confidence: 99%

About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials

et al. 2021

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Guaranteeing of the Mechanical Characteristics of Soldered Thin-Walled Structures of Ni – 20Cr – 6Al – 1Ti –1Y2O3 Refractory Alloy

et al. 2018

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Ensuring Strength of the Seam of Thermal Protective Structures from Thin-Sheet Nickel Alloys Obtained by Laser Vacuum Welding

Alnusirat¹,

Salenko²,

Shlyk³

et al. 2022

Metallofiz. Noveishie Tekhnol.

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The results of studying the laser vacuum welding of the elements of heatshielding structures made by dispersion-hardened alloys Ni-20Cr-6Al-Ti-Y 2 O 3 of increased strength are presented. Also, the designs of the heatinsulating elements which are of cellular (honeycomb) structure consisting of two plates with thickness from 0.1 to 0.14 mm with fillers inside are considered. It is shown that the shallow thickness of the plates and the complexity of the design significantly complicate the possibility to firmly connect these elements and do not allow to use the known methods like diffusion welding or vacuum soldering. It is concluded that laser welding providing satisfactory structural strength and reliability can be an alternative to known methods. Local heating at certain points prevents deformation of the parts to be joined

show abstract

Special features of diffusion welding of EP975 creep-resisting alloy and VKNA-4U cast single-crystal intermetallic alloy for blisk structures

Cited by 5 publications

References 1 publication

About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials

About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials

Guaranteeing of the Mechanical Characteristics of Soldered Thin-Walled Structures of Ni – 20Cr – 6Al – 1Ti –1Y2O3 Refractory Alloy

Ensuring Strength of the Seam of Thermal Protective Structures from Thin-Sheet Nickel Alloys Obtained by Laser Vacuum Welding

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