Influence of Surfacing Technologies on Structure Formation of High-Temperature Nickel Alloys

Krivonosova, E. A.; Shchitsyn, Yu. D.; Трушников, Д. Н.; Myshkina, Albina; Akulova, S. N.; Неулыбин, С. Д.; Dushina, A. Yu.

doi:10.1007/s11015-019-00810-1

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…To select the frequency of the slope control, there were preliminary studies of single-roll samples [1]. One can conclude that the best results in terms of the stability of the beads formation, structure and mechanical characteristics were provided by the plasma-jet hard-facing with a current modulation on a frequency of more than 5000Hz.…”

Section: Results Of the Study Devoted To The Effect Of The Current Fr...mentioning

confidence: 99%

“…It is known that the production of high-quality products in additive manufacturing is provided by welding deposit technologies using highly concentrated energy sources [1,2]. The specificity of layer growth of products in additive manufacturing requires studying the influence of technological parameters on the regularities of the formation of the weld bead, the structure and properties of the obtained material.…”

Section: Introductionmentioning

confidence: 99%

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Research of the technological methods influence on the formation of structure and properties during the additive growth of products from nickel chromium steels of the austenitic class by plasma-jet hard facing methods

Ol’shanskaya

Dushina

Трушников

2022

J. Phys.: Conf. Ser.

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The paper considers the influence of a change in the heat rate of a source with time by means of slope control, using the example of plasma-jet hard facing, as well as changes in the original structure due to laminated cool post weld upsetting of the pads, using the example of plasma-jet heat-facing with a consumable electrode (Plasma-MIG). It was found that the formation of the structure is accompanied by metal deposits transcrystallization. It is shown that the use of vibratory actions on the liquid bath by slope control modulating during plasma surfacing contributes to the partial suppression of transcrystallization of the metal deposit: the direction of columnar crystallites growth changes relative to the previous layer, contributes to the refinement of the pine-tree structure, which leads to a change in mechanical characteristics. The best properties are observed when surfacing with slope control with a frequency of 15000 Hz. The use of laminated cool post weld upsetting during the plasma-jet hard-facing by consumable electrode reduces the transcrystallization of the metal deposit. It forms dendritic crystals of an equiaxial form, which leads to the reduction of the morphological grain flow, and the strength characteristics of the fused on alloy exceeds the level of the metal durability fused on without post weld upsetting and materials obtained by traditional technologies. However, the moldability characteristics remain at a high level.

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Section: Results Of the Study Devoted To The Effect Of The Current Fr...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research of the technological methods influence on the formation of structure and properties during the additive growth of products from nickel chromium steels of the austenitic class by plasma-jet hard facing methods

Ol’shanskaya

Dushina

Трушников

2022

J. Phys.: Conf. Ser.

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“…Кроме того, разрабатываются технологии с проковкой каждого наплавленного слоя материала пневматическим ударным инструментом (пневмомолотком) или обкаткой его роликом. Технологии аддитивного производства проволочно-дуговой наплавкой с послойной точечной обработкой давлением или термомеханической обработкой в последние десять лет разрабатываются рядом научных организаций: университетами Крэнфилда и Манчестера [1][2][3][4][5], Индийским институтом технологии Бомбея [6; 7], Пермским национальным исследовательским политехническим университетом [8][9][10][11][12], Брянским государственным техническим университетом [13; 14], Университетом Квинсленда [15], Пекинским технологическим институтом [16], Томским политехническим университетом [17] и Институтом физики прочности и материаловедения СО РАН [18].…”

Section: Introductionunclassified

Strength and Ductility Characteristics of Metal Alloys and Stainless Steels Created by Wire-Arc Surfacing in a Wide Range of Strain Rates

Bayandin

Dudin

Ilyinykh

et al. 2023

PNRPU Mechanics Bulletin

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To select rational parameters of the process of hybrid additive manufacturing of structures made of structural metal alloys and stainless steels, mechanical characteristics capable of serving as indicators of material quality were determined. The most advanced technologies of additive manufacturing by wire-arc surfacing (plasma, plasma arc with a melting electrode, including cold metal transfer) with layer-by-layer forging with a pneumatic impact tool and subsequent heat treatment were used. Aluminum-magnesium alloy AlMg5, titanium alloy Ti-6Al-4V, austenitic stainless steels 12Cr18Ni10Ti (AISI 321) and AISI 308LSi have been studied. Samples were cut from the blanks created by additive manufacturing – blades for standard tests for static uniaxial tension and cylinders for high-speed compression tests by the Kolsky method on a Hopkinson split bar. According to the registered and processed stress–strain curves for all materials, standard strength and ductility characteristics and the Johnson – Cook law of deformation and speed hardening were determined. For a correct assessment of the mechanical properties of additively produced materials, these tests were also carried out for each of them in the form of annealed rolled products. It is established that to compare the efficiency of various technological parameters of additive manufacturing, it is advisable to use static tensile strength and uniform elongation to rupture, having the smallest statistical variation. It was also found acceptable to approximate the Johnson – Cook law of the deformation curves of each of the studied materials according to averaged data, including various technological modes. Certain mechanical characteristics seem to be necessary for the search for effective modes of hybrid additive manufacturing and numerical calculation of various elastic-plastic problems in a dynamic formulation for the studied materials for design and technological needs.

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“…The use of additive arc processes, which make it possible to synthesize large-sized components with minimum allowance for machining and mechanical properties at the metal level of traditional technologies, permits to obtain significant metal saving and reduce many-fold the production tooling spendings [1][2][3][4][5][6][7]. This fully applies to making products of such expensive materials as titanium alloys [8][9].…”

mentioning

confidence: 99%

Application of plasma surfacing for additive formation of titanium alloy billets

Shchitsyn¹,

Krivonosova²,

Ol’shanskaya³

et al. 2021

nfm

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This paper presents the findings of an investigation on the main formation regularities of structure and properties of VT20 (ВТ20) superalloy of Ti -Al -V -Mo -Zr system in hybrid technology of additive manufacturing with the use of plasma surfacing with layer-by-layer strain hardening. When studying the effect of forging on the structure and properties of surfacing material, three processing schemes were implemented: surfacing with forging of a next to last layer; surfacing with forging of the last layer; surfacing with forging of each layer. Investigated is the morphology of the built-up layers' structure, which is associated with various cooling rates at the stages of crystallization and transformations in the solid state: at high cooling rate, a basket weave structure is forming, and a martensite-like lamellar structure arises on slow cooling. Different dispersities of the plates of D-colonies were fixed -from 200 to 500 μm, the size of individual needles varies from fractions of a micron to 100 μm. It is established that the layer-by-layer deformation impact, which contributes to the titanium alloy structure grinding and a rise in dispersion of the D-phase plates, is accompanied by an increase in microhardness to the level of 6000 HV. The formation of a finer structure during surfacing with a layer-by-layer deformation effect is obviously bound up with the martensate phase lightened growth on a pre-crushed metal substrate with an increased dislocation density. It is established that the strength properties of the obtained VT20 alloy surfacings exceed the strength level of materials made by traditional forming technologies, and there is no decrease in the plasticity characteristics.

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Influence of Surfacing Technologies on Structure Formation of High-Temperature Nickel Alloys

Cited by 9 publications

References 2 publications

Research of the technological methods influence on the formation of structure and properties during the additive growth of products from nickel chromium steels of the austenitic class by plasma-jet hard facing methods

Research of the technological methods influence on the formation of structure and properties during the additive growth of products from nickel chromium steels of the austenitic class by plasma-jet hard facing methods

Strength and Ductility Characteristics of Metal Alloys and Stainless Steels Created by Wire-Arc Surfacing in a Wide Range of Strain Rates

Application of plasma surfacing for additive formation of titanium alloy billets

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