Severe Plastic Deformation and Its Application on Processing Titanium: A Review

Husaain, Zahid; Ahmed, Awais; Irfan, Osama M.; Al-Mufadi, Fahad A.

doi:10.7763/ijet.2017.v9.1011

Cited by 17 publications

(8 citation statements)

References 33 publications

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“…Various SPD methods [20,21] are introduced to improve mechanical, physical, and functional properties of metals and alloys by forming their submicrocrystalline structure [22,23]. Twist extrusion (TE) is a variant of the simple shear deformation process that was introduced by Beygelzimer [24].…”

Section: Twist Extrusionmentioning

confidence: 99%

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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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Section: Twist Extrusionmentioning

confidence: 99%

“…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]. In this work the Beygelzimer's approach [41,44] is followed.…”

Section: Twist Extrusionmentioning

confidence: 99%

Advanced Materials and Technologies for Compressor Blades of Small Turbofan Engines

2020

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“…Finally, in many thermoplastic deformation publications the matter of the high total strain is often neglected. This factor is however of the extreme importance as many SPD researchers indicate [4], [15], [17], [29]. Thus, we decided to deform our samples until the height reduction of 60% was reached, which corresponds with the true strain equal 0.92.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic compression is a technique of pure titanium microstructure enhancement for biomedical applications

Bańczerowski,

Pawlikowski,

Płociński

et al. 2023

Preprint

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Pure titanium due to its high corrosion resistance, low stiffness and good mechanical properties is commonly used in medicine for orthopaedic applications. However, its material properties can be further enhanced to better fulfil the role of the biocompatible material. The thermoplastic deformation in heightened temperature is proposed as a method for microstructure improvement. Titanium samples were compressed in different temperatures and strain rates in order to determine the best conditions for grain fragmentation – the main factor responsible for strength and hardness increase. The thermoplastic stress-strain curves were registered. Then microstructure observations and electron backscatter analysis were performed on the chosen samples. Finally, mechanical response of the previously deformed material was obtained in room temperature compression tests. A significant grain fragmentation was recorded for the material deformed in 400 °C, at 0.1/s and 1/s strain rates. Desirable results were also noticed for the deformation performed at 500-600 °C. However, high temperatures (700-800 °C) and strain rates (10/s) resulted in dynamic recrystallization, causing undesirable grain growth. An increase in hardness was observed in all cases, with higher values recorded in lower deformation temperatures. Room temperature compression tests revealed slight increase of ductility.

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“…Extrusion by ECAP method enables obtaining of a fine-grain structure in larger volumes. Products made by this technique are characterised by high strength properties (Figure 2), and they can be potentially used at subsequent super-plastic forming [1][2][3]. Magnitude of deformation, development of structure and resulting mechanical properties achieved by this technique depend notably on: homologous temperature Th, size of grain dz, deformation speed   , homologous tension in die () density of structural failures, on purity, etc [4][5][6].…”

Section: Introductionmentioning

confidence: 99%