Effect of the deformation zone on the structure refinement in metals

Utyashev, F. Z.; Рааб, Г. И.

doi:10.1134/s0031918x0712006x

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…The values for the relative deformation components presented above agrees with the fragmentation kinetics, which are expressed by the following equation with satisfactory accuracy [13] ( 14) where V f is the fragmented volume fraction, i.e., the fraction of microbands formed in the deformed vol ume V. As fragmentation is caused by crystalline shear, this mode of deformation peaks at the beginning of the process and asymptotically reduces to zero as deformation finishes. Grain boundary shear does not lead to the accumulation of lattice dislocations in grains, as it does not create new lattice dislocations.…”

Section: Cold Deformationmentioning

confidence: 69%

Deformational nanostructuring and treatment of metallic materials

Utyashev

Sukhorukov

2014

J. Mach. Manuf. Reliab.

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Theoretical and practical aspects of the production and treatment of nanomaterials are presented. Metals are used to show the main evolutionary stages of the matrix structure of metallic materials during deformation and the factors influencing the reduction of grain size. The formation mechanisms of small sized grains during cold and hot deformation are studied. An equation is devel oped that allows the calculation of the average size of cells in the process of formation-predecessors of small sized grains-depending on the accumulated deformation and the scale factor. Dispersion hardening nickel alloys are used to demonstrate the possibility of fundamental control over mechani cal properties from high heat resistance to superplasticity and, inversely, as a result of deformational thermal treatment, leading to a direct and reverse inversion of nano and micro sized intermetallic particles and the transformation of their boundary type from coherent to incoherent. The variation in the microstructure and mechanical properties of dispersion hardening alloys is considered for the pro duction of key components such as the discs and shafts of gas turbine engines.

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Section: Cold Deformationmentioning

confidence: 69%

Deformational nanostructuring and treatment of metallic materials

Utyashev

Sukhorukov

2014

J. Mach. Manuf. Reliab.

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“…[35,36] A possible explanation for this phenomenon was given in refs. SPD studies have shown that, for all other conditions being the same, the growing dimensions of the workpieces lead to an increase in the smallest attainable average grain size.…”

Section: Distribution Of Mechanical Properties After 2 and 4 Passes Omentioning

confidence: 94%

“…SPD studies have shown that, for all other conditions being the same, the growing dimensions of the workpieces lead to an increase in the smallest attainable average grain size. [35,36] A possible explanation for this phenomenon was given in refs. [36,37] Figure 7.…”

Section: Distribution Of Mechanical Properties After 2 and 4 Passes Omentioning

confidence: 96%

The Occurrence of Ideal Plastic State in CP Titanium Processed by Twist Extrusion

et al. 2017

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This paper deals with the analysis of strength and plastic characteristics of commercially pure (CP) titanium as a function of equivalent plastic strain accumulated during Twist Extrusion (TE) process. It is shown experimentally that multipass TE leads to the saturation of the following characteristics of the material: yield stress, reduction in area, elongation to failure, and uniform elongation. This fact indicates the occurrence of an ideal plastic state in the processed material. The threshold value of accumulated plastic strain for ideal plastic behavior of CP titanium during TE is defined. The strain state and mechanical properties of CP titanium billets processed by TE are studied. An explanation for the hardening on the axis of a billet during TE is offered. The analysis of deformation modes on the billet axis during TE and High Pressure Torsion is carried out. It is shown that the differences in strain state on the axis are caused by the difference in symmetry of these processes.

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“…and Spellman, D.L. [13][14][15][16] included the removal of blades from the rotor, removal of protective pads, mechanical removal of the damaged edge section, multilayer surfacing of the restored edge section, furnace heat treatment, mechanical treatment of the blade and welding-on of stellite protective plates. A significant disadvantage of this method is the lack of heat treatment after welding of the protective pads, as a result of which the blade material retains the high heterogeneity of the structural-phase composition and a high level of tensile residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Turbine Blade Surface Phase Structure Recovered by Plasma Spraying

et al. 2020

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This paper presents the results of research on the construction, technological parameters and criteria that control the process of formation of optimal phase structure of austenitic- and martensitic-class material for steam turbine blades. The hypothesis that the established correlation could increase the quality of blade recovery and its resistance against dynamic and vibrational loads was proved. The efficiency of the developed implantation method for the recovery of steam turbine blades was demonstrated. The optimal technological parameters of the process of laser plasma recovery were established empirically, allowing the development of the system for the fine tuning of the phase composition of austenitic- and martensitic-class steel.

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Effect of the deformation zone on the structure refinement in metals

Cited by 14 publications

References 2 publications

Deformational nanostructuring and treatment of metallic materials

Deformational nanostructuring and treatment of metallic materials

The Occurrence of Ideal Plastic State in CP Titanium Processed by Twist Extrusion

Improvement of the Turbine Blade Surface Phase Structure Recovered by Plasma Spraying

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