Hollow Twist Extrusion: Introduction, Strain Distribution, and Process Parameters Investigation

Joudaki, Jalal; Safari, Mehdi; Alhosseini, S. M.

doi:10.1007/s12540-019-00301-7

Cited by 13 publications

(5 citation statements)

References 32 publications

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“…Furthermore, during the past decade, twist extrusion (TE) was introduced as a means of combining the benefits of shear and torsion SPD-based deformation processes, which enables an unprecedented ability to process several solid and hollow cross-sections except circular cross-sections [21]. Based on its promising potential and superior industrial capabilities, several recent modifications based on TE straining principles have been devised, such as twist angular pressing (TCAP) [22], hollow twist extrusion [23], online twist extrusion [24], and planar twist extrusion [25]. However, most of these variants have been primarily designed to increase the induced strain and the ability to process specific cross-sections while neglecting financial feasibility aspects such as die cost and die durability.…”

Section: Introductionmentioning

confidence: 99%

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%

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 aforementioned topics could be addressed in several published manuscripts. Grain refinement, which may confer greater formability for a wide range of metallic materials due to twist extrusion, was numerically analysed by Joudaki et al [1] and Yalcinkaya et al [2]. Improved PCBN (Polycrystalline Cubic Boron Nitride) tools for milling operations were discussed and experimented on by Wang et al [3], giving an important contribution to the field of the machining of hard materials.…”

Section: Contributionsmentioning

confidence: 99%

Numerical and Experimental Advances in Innovative Manufacturing Processes

Sousa

Safari

2021

Metals

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“…There are different approaches to modelling and optimising the TE process [42,43], usually based on FE methods. Calculations and experiments are aimed to obtain high plastic strain and uniform ultrafine grains [21].…”

Section: Twist Extrusionmentioning

confidence: 99%

Advanced Materials and Technologies for Compressor Blades of Small Turbofan Engines

2020

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Manufacturing costs, along with operational performance, are among the major factors determining the selection of the propulsion system for unmanned aerial vehicles (UAVs), especially for aerial targets and cruise missiles. In this paper, the design requirements and operating parameters of small turbofan engines for single-use and reusable UAVs are analysed to introduce alternative materials and technologies for manufacturing their compressor blades, such as sintered titanium, a new generation of aluminium alloys and titanium aluminides. To assess the influence of severe plastic deformation (SPD) on the hardening efficiency of the proposed materials, the alloys with the coarse-grained and submicrocrystalline structure were studied. Changes in the physical and mechanical properties of materials were taken into account. The thermodynamic analysis of the compressor was performed in a finite element analysis system (ANSYS) to determine the impact of gas pressure and temperature on the aerodynamic surfaces of compressor blades of all stages. Based on thermal and structural analysis, the stress and temperature maps on compressor blades and vanes were obtained, taking into account the physical and mechanical properties of advanced materials and technologies of their processing. The safety factors of the components were established based on the assessment of their stress-strength characteristics. Thanks to nomograms, the possibility of using the new materials in five compressor stages was confirmed in view of the permissible operating temperature and safety factor. The proposed alternative materials for compressor blades and vanes meet the design requirements of the turbofan at lower manufacturing costs.

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Hollow Twist Extrusion: Introduction, Strain Distribution, and Process Parameters Investigation

Cited by 13 publications

References 32 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

Numerical and Experimental Advances in Innovative Manufacturing Processes

Advanced Materials and Technologies for Compressor Blades of Small Turbofan Engines

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