Severe Plastic Deformation Methods for Sheets

Faraji, Ghader; Kim, Hyoung Seop; Kashi, Hessam Torabzadeh

doi:10.1016/b978-0-12-813518-1.00003-5

Cited by 51 publications

(38 citation statements)

References 39 publications

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“…The samples were maintained at 350 • C for 20 min before starting each compression. A strain of 0.7 per pass and a cumulative strain of ∑e = 2.1 per cycle were applied [42]. A graphite-based lubricant (Liqui Moly, Ulm, Germany) was used to decrease the friction between the die elements and the sample.…”

Section: Mgmentioning

confidence: 99%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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The current study observed a grain structure evolution in the central part and periphery of the sample of an Al–Mg–Mn-based alloy during isothermal multidirectional forging (IMF) at 350 °C with a cumulative strain of 2.1–6.3 and a strain per pass of 0.7. A bimodal grain size distribution with areas of fine and coarse grains was observed after IMF and subsequent annealing. The grain structure, mechanical properties, and superplastic behavior of the samples subjected to IMF with a cumulative strain of 6.3 and the samples exposed to IMF with subsequent cold rolling were compared to the samples exposed to a simple thermo-mechanical treatment. The micro-shear bands were formed inside original grains after the first three passes. The fraction of recrystallized grains increased and the mean size decreased with an increasing cumulative strain from 2.1 to 6.3. Significant improvements of mechanical properties and superplasticity were observed due to the formation of a homogenous fine grain structure 4.8 µm in size after treatment including IMF and subsequent cold rolling.

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Section: Mgmentioning

confidence: 99%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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“…To check the adequacy of the simulation results, commercially pure copper Cu-ETP workpieces were deformed with initial dimensions of 20 × 14 × 40 mm 3 , which was divided into two parts, each 20 mm long. A dividing grid with a mesh size of 2 × 2 mm was deposited on the inner end surface of one part of the workpiece.…”

Section: Experimental Researchmentioning

confidence: 99%

“…Existing processes of severe plastic deformation (SPD) are based on the creation of essential gradient of material plastic deformation, which is carried out according to the scheme of simple shear [1,2]. Researches show that such a deformation scheme is necessary to obtain ultrafine-grained (UFG) materials, the grain boundaries of which are highly (more than 15 degrees) misoriented [3,4]. In this case, the degree of accumulated plastic strain should exceed 2 [5].…”

Section: Introductionmentioning

confidence: 99%

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Development and FEM Modeling of a New Severe Plastic Deformation Process according to the Reverse Shear Scheme

Tarasov

Altukhov

Gribkov

et al. 2019

Modelling and Simulation in Engineering

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Industrial commercial use of SPD processes is in some cases hindered by the complexity of equipment and high loads on the tool associated with high hydrostatics upon implementation of existing deformation processes. New and modified SPD schemes are offered relatively often, so the methods for their creation, modeling, and ways of improvement are of particular interest. Therefore, the article provides a classification of SPD schemes, which are divided into several groups depending on the nature of the material flow in the deformation zone. The second attribute of the fission process is the volume of the metal, contemporaneously located in the plastic deformation zone. An analysis of the influence of SPD schemes on the features of formation of a plastic deformation zone allows us to identify promising ways to modify them. A new SPD process is proposed, called as the “Reverse Shear” (RS), in which the workpiece is deformed under conditions of flat deformed state, uniform in each cross section along the entire length of the workpiece. The RS process allows us to change the paths of deformation to redistribute strain within the workpiece volume due to different positioning of a workpiece in a die. To justify the proposed deformation scheme, the SPD processes are divided into groups and an analysis of the deformation schemes’ features, which are analogs of RS, is performed. Simulation of the considered SPD processes was performed using FEM, implemented in specialized QForm CAE-system. A study of the influence of a tool with inclined surfaces on formation of a deformation zone in a workpiece during RS and analogues has been carried out. The degree of deformation nonuniformity in a cross section for the considered deformation schemes has been determined, and the possibilities of the proposed process are shown in comparison with analogues. The advantage of the RS scheme is the absence of unformed edges of the workpiece, which reduces material consumption, increasing the accumulated degree of deformation by one operation and reducing the tooling complexity to obtain workpieces with a desired structure. It also provides an opportunity to deform workpieces by various routes (RS-60 and RS-180) and to more specifically develop or select SPD schemes based on modeling. Changing the aspect ratio of the workpiece cross section also allows us to manage the change in its stress-strain state during deformation. Comparisons with the experiment carried out for three operations of deformation of a Cu-ETP copper sample by the RS-60 route show that the simulation results correspond to the real process.

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“…The high-energy ball mill system consists of turn discs and jars. The oppositely rotating jar and turning disc produce highly energetic impact energy ( Figure 1) [30]. However, while the ball size is an important factor in ball milling, the effect of the ball size on the comminution of talc has not yet been fully understood [31,32].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ball Size on the Grinding Behavior of Talc Using a High-Energy Ball Mill

Kim

et al. 2019

Minerals

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The properties and preparation of talc have long been investigated due to its diverse industrial applications, which have expanded recently. However, its comminution behavior is not yet fully understood. Therefore, having better control of the particle size and properties of talc during manufacturing is required. In this study, we investigate the effect of the ball size in a high-energy ball mill on the comminution rate and particle size reduction. High-energy ball milling at 2000 rpm produces ultrafine talc particles with a surface area of 419.1 m2/g and an estimated spherical diameter of 5.1 nm. Increasing the ball size from 0.1 mm to 2 mm increases the comminution rate and produces smaller talc particles. The delamination of (00l) layers is the main comminution behavior when using 1 mm and 2 mm balls, but both the delamination and rupture of (00l) layers occurs when using 0.1 mm balls. The aggregation behavior of ground talc is also affected by the ball size. Larger aggregations form in aqueous solution when ground with 0.1 mm balls than with 1 mm or 2 mm balls, which highlights the different hydro-phobicities of ground talc. The results indicate that optimizing the ball size facilitates the formation of talc particles of a suitable size, crystallinity, and aggregation properties.

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Severe Plastic Deformation Methods for Sheets

Cited by 51 publications

References 39 publications

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Development and FEM Modeling of a New Severe Plastic Deformation Process according to the Reverse Shear Scheme

Effects of Ball Size on the Grinding Behavior of Talc Using a High-Energy Ball Mill

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