Prospects of development of welded single-crystal structures of heat-temperature nickel alloys

Yushchenko, K. A.; Zadery, B.A.; Gakh, I.S.; Zvyagintseva, A.V.

doi:10.15407/tpwj2018.12.09

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…The results of the performed metallographic studies of the structural features of welded joints of heat-resistant nickel alloys single crystals, as well as the interpretation of the mechanism of its formation, are in good agreement with the previously performed studies of the temperature-time and temperature-spatial characteristics of the welding process [19,20], the established dependences of the rate of solidification and cooling of the weld metal on the welding speed, changes in the value of the crystallization parameters G and R over the weld cross section at different welding regime [19].…”

Section: Discussionsupporting

confidence: 88%

“…The change in the size of the precipitates of the hardening The size of the zone, as well as the characteristics of other parameters of the structure, is mainly determined by the degree of correspondence of the flashing surface and the direction of welding with the axes of high symmetry, the curvature of the macrofront of solidification of the weld pool and the temperature-time parameters G × R (where G is the direction of the maximum temperature gradient on the macrofront of crystallization weld pool, R is the rate of crystallization, m/h) of the process (Fig. 7) [19,20]. In this case, the zone can reach both the weld axis and decrease to the size of the dendritic cell near the fusion line.…”

Section: Epitaxial Growth Zonementioning

confidence: 99%

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Features of the Microstructure of Welded Joints of Single Crystals of Heat-Resistant Nickel Alloys

Yushchenko¹,

Zadery²,

Gakh³

et al. 2021

Metallofiz. Noveishie Tekhnol.

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The peculiarities of the microstructure of welded joints of single crystals of heat-resistant nickel alloys made by electron beam welding are considered. The main structural areas of the welded joint are identified: the base metal, the heat effect zone (HAZ), the fusion area, the epitaxial growth zone, the weld sections corresponding to different deviations of the maximum heat dissipation from the orientation of the predominant crystal growth. The dependences of the structure of separate areas, their sizes from the initial crystallographic orientation of the single crystal, the brand of the studied alloy, temperature-temporal and temperature-spatial parameters of the process, determined mainly by welding modes, are established. HAZ is dominated by changes (γ + γ′)-structures consisting in complete or partial dissolution of the primary γ′-phase, large globular eutectic formations with subsequent (upon cooling) separation of the dispersed nanosized secondary γ′-phase. The weld metal is characterized by more noticeable changes in the dendritic structure-variables in the cross section of the weld, its parameters and morphology, a decrease in chemical inhomogeneity compared to the original metal.

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Section: Discussionsupporting

confidence: 88%

Section: Epitaxial Growth Zonementioning

confidence: 99%

Features of the Microstructure of Welded Joints of Single Crystals of Heat-Resistant Nickel Alloys

Yushchenko¹,

Zadery²,

Gakh³

et al. 2021

Metallofiz. Noveishie Tekhnol.

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show abstract

Repair surfacing of gas turbine engine blades from high-temperature nickel alloys with surface defects and damage

Yushchenko¹,

Gakh²,

Zadery³

et al. 2019

Avtom. svarka (Kiev)

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Repair surfacing of gas turbine engine blades from high-temperature nickel alloys with surface defects and damage

Yushchenko¹,

Gakh²,

Zadery³

et al. 2019

The Paton Welding J.

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Cored wires are used in numerous welding processes with or without external gas or flux shielding. Submerged arc welding (SAW) with cored wires, seamed or seamless, for joining mild and low alloyed steel grades is a technique that has demonstrated clear advantages during the three last decades. Ever since its invention, the SAW process has evolved with one main goal: to combine quality with productivity. With low alloy wires, the benefits have already been clearly demonstrated and widely exploited. However, little has been written on SAW and cladding with cored wires for corrosion or heat resisting applications. Its extension to high alloy compositions brings corresponding benefits and adds some specific and unique features. This paper focuses on consumable specificities and on the quality and productivity features of SAW with CRA (corrosion resistant alloy) cored wires. It describes the potential as well as the limitations of this technique. Cored wires are now used for submerged arc welding of almost all stainless steels ranging from soft martensitic to super-duplex, and for a series of nickel base compositions as well as for cladding cobalt base alloys. Examples of industrial applications with austenitic, duplex, martensitic and heat resisting stainless steels are given to illustrate the potential of the cored wire solution. 13 Ref., 4 Tables , 25 Figures.

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Prospects of development of welded single-crystal structures of heat-temperature nickel alloys

Abstract: s.I. Kuchuk-Yatsenko (vice-chief ed.), V.N. Lipodaev (vice-chief ed.

Cited by 5 publications

References 8 publications

Features of the Microstructure of Welded Joints of Single Crystals of Heat-Resistant Nickel Alloys

Features of the Microstructure of Welded Joints of Single Crystals of Heat-Resistant Nickel Alloys

Repair surfacing of gas turbine engine blades from high-temperature nickel alloys with surface defects and damage

Repair surfacing of gas turbine engine blades from high-temperature nickel alloys with surface defects and damage

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