High-temperature thermomechanical treatment of Kh8 type alloys

Bernshtein, M. L.; Cherepanova, G. I.; Ryzhak, S. S.

doi:10.1007/bf00654314

Cited by 5 publications

(11 citation statements)

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“…Among these metals, only twenty or thirty have found wide application, including iron, aluminum, copper, nickel, titanium, tin, lead, zinc, magnesium, niobium, zirconium, and beryllium, as well as precious, refractory, radioactive, and some other metals [1][2][3][4][5][6][7]. In the last century, increasing industrial demands for various structural and functional metallic materials have stimulated the advent of new technologies and the development of high alloy steels and alloys on their basis.…”

Section: Introductionmentioning

confidence: 99%

“…The range of alloying elements gradually widens and their fraction in the total mass of materials increases. For example, some grades of steels and alloys, in particular, stainless, high temperature, and high strength steels and allows, already contain four or five alloying elements in concentrations of up to 30-40 wt %; high strength aluminum alloys contain three or four alloying elements in concentrations of up to 10-15 wt %; brasses and bronzes contain alloying elements in concentrations of up to 40 and 15 wt %, respectively [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Specific features of cast high-entropy AlCrFeCoNiCu alloys produced by ultrarapid quenching from the melt

Ivchenko

Pushin

Уксусников

et al. 2013

Phys. Metals Metallogr.

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Abstract-Results of studying structural and phase transformations that occur in the cast high entropy equi atomic AlCrFeCoNiCu alloy after ultrarapid quenching from the melt in an inert atmosphere (RQM) and var ious isothermal treatments are presented for the first time. The investigations have been performed using ana lytical, transmission and scanning electron microscopy, energy dispersive X ray spectroscopy, and X ray diffrac tion structure and phase analyses, as well as measurements of the nanohardness, microhardness, and elastic moduli. It has been found that an ultrafine grained structure is formed in this alloy during RQM. Already during quenching and, especially, during subsequent annealing, the alloy undergoes decomposition, which is accom panied by the precipitation in the bcc (B2) matrix of some nanosized phases, predominantly of equiaxed mor phology, both atomically ordered (B2) and disordered (A2), with various chemical compositions. All nanophases are multicomponent solid solutions and are enriched in a few elements, which leads to a pro nounced nanomodulation of the elemental and phase compositions over the alloy bulk, identified, in particular, from the presence of satellites in the vicinity of some reflections in selected area electron diffraction patterns.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Specific features of cast high-entropy AlCrFeCoNiCu alloys produced by ultrarapid quenching from the melt

Ivchenko

Pushin

Уксусников

et al. 2013

Phys. Metals Metallogr.

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“…Generally speaking, there are only two or three dozen frequently used conventional metals, including iron, aluminum, copper, precious metals, nickel, titanium, tin, lead, zinc, magnesium, niobium, zirconium, beryllium, and refractory, radioactive, and other metals [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…This increased the number of alloying elements, as well as their fraction in the total material mass. For instance, some primarily corrosion resistant, heat resistant, and high strength steels and alloys already contain four or five controllable alloying elements up to 30-40% in weight; high strength aluminum alloys include three or four elements up to 10-15% in weight; and brass and bronze, up to 40 and 15%, respectively [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure features of high-entropy equiatomic cast AlCrFeCoNiCu alloys

Ivchenko

Pushin

Уксусников

et al. 2013

Phys. Metals Metallogr.

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Abstract-The structural and phase transformations that take place in the cast high entropy equiatomic alloy AlCrFeCoNiCu after solidification, homogenizing heat treatment, and cooling have been studied. Analytical transmission microscopy, scanning electron microscopy, X ray energy dispersive spectroscopy, and X ray dif fraction analysis were used to conduct the studies. The elastic modulus, nano , and microhardness have been measured. The alloy decomposition has been found to occur with the precipitation of no less than six nanos cale phases with different morphologies, structures (A2, B2, L1 2 ), and chemical compositions. All the nanophases are multicomponent solid solutions enriched with several elements, which indicates the pro nounced elemental and phase nanomodulation over the alloy volume.

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“…Starting from the middle of the last century, the great attention has been paying to thermal and thermo-mechanical treatments in combination with the modification of the chemical composition of high-strength low-alloyed steels in order to obtain a specific microstructure, which should provide a high level of strength and toughness. It has been observed that surprisingly high strength could be obtained in low-alloy (mainly nickel-chromium) steels by warm working of austenite prior to martensite (or bainite) transformation [12][13][14]. Such thermo-mechanical treatment involving the deformation of meta-stable austenite has been called ausforming [15].…”

Section: Ausformingmentioning

confidence: 99%

Tempforming as an Advanced Processing Method for Carbon Steels

Dolzhenko

Kaibyshev

Belyakov

2020

Metals

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The microstructural mechanisms providing delamination toughness in high-strength low-alloyed steels are briefly reviewed. Thermo-mechanical processing methods improving both the strength and impact toughness are described, with a close relation to the microstructures and textures developed. The effect of processing conditions on the microstructure evolution in steels with different carbon content is discussed. Particular attention is paid to tempforming treatment, which has been recently introduced as a promising processing method for high-strength low-alloyed steel semi-products with beneficial combination of strength and impact toughness. Tempforming consists of large strain warm rolling following tempering. In contrast to ausforming, the steels subjected to tempforming may exhibit an unusual increase in the impact toughness with a decrease in test temperature below room temperature. This phenomenon is attributed to the notch blunting owing to easy splitting (delamination) crosswise to the principle crack propagation. The relationships between the crack propagation mode, the delamination fracture, and the load-displacement curve are presented and discussed. Further perspectives of tempforming applications and promising research directions are outlined.

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High-temperature thermomechanical treatment of Kh8 type alloys

Cited by 5 publications

References 0 publications

Specific features of cast high-entropy AlCrFeCoNiCu alloys produced by ultrarapid quenching from the melt

Specific features of cast high-entropy AlCrFeCoNiCu alloys produced by ultrarapid quenching from the melt

Microstructure features of high-entropy equiatomic cast AlCrFeCoNiCu alloys

Tempforming as an Advanced Processing Method for Carbon Steels

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