Structure and hardness of cold-rolled nickel after single and multiple electric pulse treatment

Valeev, I. Sh.; Valeeva, A. Kh.; Ilyasov, Rafis; Sitdikov, Oleg; Маркушев, М. В.

doi:10.22226/2410-3535-2019-4-447-450

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Ключевые слова: криогенная прокатка, электроимпульсная обработка, твердость, рекристаллизация, возврат. [16,17]. При этом важнейшая роль в получении объектов с регламентированной дисперсностью структуры и повышенным комплексом свойств отводится режимам ЭИО, контролирующим полноту и кинетику процессов трансформации деформационной структуры в более равновесную, в том числе рекристаллизованную [7,18].…”

Section: влияние электроимпульсной обработки на структуру и твердость криокатаного алюминияunclassified

“…Из полос на электроэрозионном станке АРТА 207 вырезали образцы, имевшие форму образцов для механических испытаний с размерами рабочей части 3 × 4 × 0.4 мм 3 . Последующую ЭИО проводили по методике и с использованием оборудования, подробно описанным в [16]. Энергию обработки (интегральную плот-ность тока (K j )) изменяли в диапазоне от 0.06 ×10 5 до 0.29 ×10 5 А 2 с / мм 4…”

Section: материал и методыunclassified

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Influence of electric pulse treatment on structure and hardness of cryorolled aluminum

et al. 2021

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The influence of the energy of electric pulse treatment (EPT) in the range of integral current densities (K j ) from 0.06 ×10 5 to 0.29 ×10 5 A 2 s / mm 4 on the structure and hardness of coarse-grained high-purity Al, isothermally rolled up to a total strain of 90 % at a liquid nitrogen temperature, was studied. It was found that EPT with an energy up to К j = 0.104 ×10 5 A 2 s / mm 4 practically did not affect the microhardness obtained in the cryorolled aluminum (45 -50 HV). An increase in the EPT energy to К j = 0.121×10 5 A 2 s / mm 4 led to a rapid drop of the hardness to 30 HV followed by its gradual stabilization near 25 HV at higher К j values. It was established that an enhanced microhardness of rolled Al resulted from formation of a well developed cellular structure with a crystallite size of about 2 μm, containing less than 10 % of ultrafine grains of about 4 μm in size. The minor hardness changes after EPT with К j up to 0.104 ×10 5 A 2 s / mm 4 were related to occurrence of recovery and continuous recrystallization, resulted only in improving the deformation structure without noticeable changes in its type and the crystallite sizes. Therewith the softening caused by a partial decrease in the scalar dislocation density and the microdeformation of the crystal lattice was compensated by increasing the high angle boundaries fraction. At EPT with К j = 0.121×10 5 A 2 s / mm 4 , the deformation structure was severely replaced by the fine-grain recrystallized one with the grain size of 19 μm, and resulted in the loss of the strenthening effect, caused by rolling. With further increase in the EPT energy, an extensive grain growth was observed, leading to the formation of a non-uniform structure grains and to appropriate material softening, owing to the grain coarsening. It was concluded that the restoration processes that took place during EPT were similar in nature to those that occur during furnace annealing of heavily deformed materials. Therewith, the short time of the thermal exposure on the deformed metal during EPT was compensated by high applied energies.

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Section: влияние электроимпульсной обработки на структуру и твердость криокатаного алюминияunclassified

Section: материал и методыunclassified

Influence of electric pulse treatment on structure and hardness of cryorolled aluminum

et al. 2021

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Effect of electric pulse treatment on the structure and hardness of nickel deformed at room and liquid nitrogen temperatures

Ilyasov

Valeeva

Valeev

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The influence of the energy of electro-pulse processing (EPP) on the structure and hardness of pure nickel deformed at room and liquid nitrogen temperatures is studied. The metal was subjected to isothermal rolling with a strain of 90% and subsequent EPP with integral current densities Kj in the range from 0.06 to 0.19×105 A2s/mm4 corresponding to the calculated temperature range of 130-925°C. It was found that decreasing the rolling temperature of Ni resulted in a more uniform and less misoriented nanocellular structure and a 15-20 HV higher hardness. Subsequent EPP decreased the hardness due to recovery, discontinuous recrystallization with the formation of annealed twins and growth of new grains. It is revealed that a more uniform fine-grained structure with a smaller grain size is formed in the cryorolled metal in a narrower interval and at less EPP energies.

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Comparative analysis of fine-grained structure formation in an Al-Zn-Mg-Cu alloy during multidirectional isothermal forging and uniaxial compression

Sitdikov

Sakai

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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A comparative study of the mechanical behavior and microstructural evolution in a cast coarse-grained 7475 Al alloy during uniaxial compression and multidirectional forging at 490°C and 10–4 s–1 was performed. It was shown that high-temperature deformation of the alloy led to grain refinement accompanied by strain softening. At similar processing conditions, the deformation path provided by multidirectional forging was found to be more favorable for grain refinement and strain softening than that of uniaxial compression.

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Structure and hardness of cold-rolled nickel after single and multiple electric pulse treatment

Cited by 6 publications

References 14 publications

Influence of electric pulse treatment on structure and hardness of cryorolled aluminum

Influence of electric pulse treatment on structure and hardness of cryorolled aluminum

Effect of electric pulse treatment on the structure and hardness of nickel deformed at room and liquid nitrogen temperatures

Comparative analysis of fine-grained structure formation in an Al-Zn-Mg-Cu alloy during multidirectional isothermal forging and uniaxial compression

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