Investigation of direct extrusion channel effects on twist extrusion using experimental and finite element analysis

Nouri, Mohammad Damghani; Semnani, Hamidreza Mohammadian; Emadoddin, Esmaeil; Kim, Hyoung Seop

doi:10.1016/j.measurement.2018.05.094

Cited by 15 publications

(7 citation statements)

References 43 publications

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“…Owing to their superior properties and unique attributes, grain refinement processes have gained the attention of researchers and scientists worldwide. Among the various physical properties, the microstructural characteristics, specifically grain size and structure, both have a pivotal function in governing the mechanical properties and overall characteristics of metals and alloys [3]. Hence, it has become intrinsically important to intensify the research conducted on "top down" severe plastic deformation (SPD) processes, as they provide an optimal approach to producing UFG structures without porosity or contamination compared to their counterpart "bottom-up" methods [2].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it has become intrinsically important to intensify the research conducted on "top down" severe plastic deformation (SPD) processes, as they provide an optimal approach to producing UFG structures without porosity or contamination compared to their counterpart "bottom-up" methods [2]. Concurrently, several SPD processes have been devised with the perpetual aim of grain refinement and simultaneous boundary strengthening [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…These elements are highly valued for industrial upscaling alongside the high power consumed due to the application of high backpressure (BP). A critical issue is the amount of BP induced in shear-based processes such as ECAP and TE, whereas several studies have demonstrated undesirable structures and skewed cross-sections when insufficient BP is applied [3,26]. Consequently, multi-channel spiral twist extrusion (MCSTE) has been introduced by the authors as a cost-saving and versatile variant to TE, which applies minimum BP, on a variety of solid and hollow cross-sections with the aid of a mandrel encompassed through a set of customizable stacks of disks, as illustrated in Figure 1a, and a reduced twist angle.…”

Section: Introductionmentioning

confidence: 99%

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Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Fouad

El-Garaihy

Ahmed

et al. 2021

Metals

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This study presents a comprehensive evaluation of the effects of multi-channel spiral twist extrusion (MCSTE) processing on the mechanical properties and structural evolution of AA5083. The structural evolution and texture developed were mapped by electron backscatter diffraction (EBSD) for three successive passes and compared with an as-annealed plate. An evaluation of the hardness and tensile properties was presented and correlated with the EBSD findings. The displayed EBSD results revealed that grain refinement was strongly associated with the presence of a high density of low-angle grain boundaries (LAGBs) after one pass, which developed into fine grains of less than 20 μm and high-angle grain boundaries (HAGBs) after three MCSTE passes. The three pass processing led to a 65% reduction in grain size. This reduction in grain size was coupled with an enhancement in the hardness and tensile properties. Additionally, the crystallographic texture study represented a slightly random texture due to the presence of intermetallic particles in AA5083. This study demonstrates the efficacy of MCSTE as a grain refinement tool.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Fouad

El-Garaihy

Ahmed

et al. 2021

Metals

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“…The results of modelling the deformation of billets in the process of TE made it possible to establish an important condition for the efficiency of compaction of powder billetsthe presence of a high level of backpressure, whose value is about 30% of the extrusion pressure [13,14]. Moreover, as a result of modelling, it was found that in the absence of backpressure, there is a noticeable loosening of the billet, and the density reduction in some parts of the billet after TE reaches 30%.…”

Section: Resultsmentioning

confidence: 99%

Design and FEA of die sets for backpressure extrusion processes: A case study for twist extrusion

Tarasov¹,

Павленко²,

Kotsyuba³

et al. 2023

Preprint

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The research focused on the development of a new die set for the implementation of pressure-assisted stamping technologies using the twist extrusion (TE) process as an example. The TE process belongs to the group of severe plastic deformation methods (SPD) and is a typical representative of this group of technologies. The main challenge in creating such die sets is the complex kinematics of the tool movement, a large stroke of the deforming tool, and increased height of the stamping block construction, which results in significant deformation of the structure. Similar problems arise in the implementation of hydroforming, stamping of elongated blanks, and pressing of parts from powder materials such as high bushings. The analysis of constructive and technological solutions implemented in existing die sets for SPD with TE has been carried out. The practical experience of operating die sets and equipment for obtaining billets of alloys of various classes in pilot and serial production is analyzed. As a result, requirements were developed for implementing the force, kinematic, and thermal. Analysis of the cycle of movement of the working tool during the operation of the die set showing that expanding the technological capabilities of universal hydraulic presses is necessary to implement this group of processes. It is proposed to use temporary mechanical fixation of the device parts relative to the moving elements of the hydraulic cylinders and the press frame. It allows expanding the technological capabilities of universal hydropress when implementing TE. The load transfer scheme to the base of the stamping die has been modified, improving the design's manufacturability and reducing deformation during maintenance operations. The advantages and disadvantages of the proposed solutions have been identified based on practical industrial experience with the proposed stamping die design. To further improve the stamping block, finite element analysis was performed to examine the loading of its structural elements during operation. Based on the modeling, structural solutions were proposed for attaching the working tool and guiding nodes of the design, which reduce the influence of elastic deformation on the die's performance. The ways of further developing the design of dies of a similar class to improve their technical characteristics are proposed.

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“…Hence, reducing the grain measure has as of now been considered a valid way to obtain materials with excellent performance. At the same time, previous studies have shown that the severe plastic deformation (SPD) method is an attractive technique, defined in the strict sense as “Processing by SPD refers to various experimental procedures of metal forming that may be used to impose high strains on materials leading to exceptional grain refinement.” 16 The most common SPD strategies incorporate equal channel angular pressing (ECAP), 17 multidirectional forgings (MDFs), 18 high-pressure torsions (HPTs), 19 friction stir processing (FSP), 20 sandglass extrusion (SE), 21 accumulated roll-bonding (ARB), 22 repetitive corrugations and straightening (RCS), 23 twist extrusion (TE), 24 multiaxial forgings (MAFs), 25 and constrained groove pressing (CGP). 26 In addition, the SPD process can not only be utilized for grain refinement of bulk materials but can also be applied to the material surface to form nanocrystalline (NC) layers with a profundity of a few microns on the surface materials.…”

Section: Introductionmentioning

confidence: 99%

A mini-review of surface severe plastic deformation methods and their effects on steel and stainless steel

Zhang

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Surface severe plastic deformation is an important technology for the preparation of bulk ultrafine grain or even nanocrystalline materials. Based on the technical achievements made in the field of surface severe plastic deformation at home and abroad, this article presents the basic principles of various kinds of surface severe plastic deformation techniques in detail. In addition, the effects of surface severe plastic deformation on the microstructure and mechanical properties of steel and stainless steel are reported. The current status of research on the effects of surface severe plastic deformation on fatigue properties and the tribological and biological properties of steel and stainless steel are summarized. The problems of the current surface severe plastic deformation technology for steel and stainless steel are pointed out, and the future development trend is foreseen.

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Investigation of direct extrusion channel effects on twist extrusion using experimental and finite element analysis

Cited by 15 publications

References 43 publications

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Grain Structure Evolution and Mechanical Properties of Multi-Channel Spiral Twist Extruded AA5083

Design and FEA of die sets for backpressure extrusion processes: A case study for twist extrusion

A mini-review of surface severe plastic deformation methods and their effects on steel and stainless steel

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