Effect of hot rolling by screw mill on microstructure of a Ti-6Al-4V titanium alloy

Lopatin, N. V.

doi:10.1007/s12289-012-1099-2

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…As a result, this method is primarily employed in the production of seamless tubes [14], in which skew rolling mills are used for piercing [15] as well as diameter reduction and elongation [16]. Skew rolling processes are predominantly used for rolling bars from hard-to-deform materials such as alloys of titanium [17,18], nickel, and magnesium [19]. The skew rolling method ensures high accuracy of products and, thus, is widely used for straightening and sizing longitudinally rolled bars in order to improve their quality [20].…”

Section: Introductionmentioning

confidence: 99%

Skew Rolling of Rods from Scrap Rail Heads

2019

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This paper presents the results of theoretical and experimental investigations of a new process of rolling rods from scrap rail heads. First, the industrial applications of scrap railway rails and methods of their recycling are discussed, and then the concept of two-stage rolling of rods from heads cut off from scrap rails is proposed. In the first stage of the process, a rail head preform was rolled in a hexagonal pass of a longitudinal rolling mill. Then in the second stage, the hexagonal bar was skew rolled into a rod in a helical roll pass. Theoretical considerations were based on finite element numerical modelling. The rolling process was simulated under 3D deformation using Forge NxT v.1.1 software developed by Transvalor Company. Calculations were carried out to determine the material flow kinematics, strength, and thermal parameters of the process and to identify the phenomena that might constrain its implementation. The numerical results were verified in experimental tests, during which preforms and rods were formed from scrap rail heads. The tests were conducted in longitudinal and skew rolling mills. The results indicate that rods can be effectively formed from scrap rail heads in just two steps. Rods obtained using the proposed method can be used as full-featured, semifinished products for the manufacture of various types of machine parts.

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Section: Introductionmentioning

confidence: 99%

Skew Rolling of Rods from Scrap Rail Heads

2019

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“…Hot rolling can eliminate the material defects by refining and homogenising the inner grains and improve the mechanical properties [135][136][137]. Therefore, it can be used to increase the density of the microstructure, by eliminating the pores at the interface between particles and substrates, and improve the strength of CSAMed deposits.…”

Section: Csam + Hot Rollingmentioning

confidence: 99%

‘Cold spray +’ as a new hybrid additive manufacturing technology: a literature review

Cao

Wang

et al. 2019

Science and Technology of Welding and Joining

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Cold spray (CS) is a new solid state coating technique that has attracted considerable attention as it is quite suitable for mass production of metallic materials or metal matrix composites. More recently, cold spray additive manufacturing (CSAM) has been proposed to fabricate/repair components or produce welding joint. However, inherently deficient in ductility/plasticity of CSAMed materials limits its application. Therefore, many hybrid processes have been proposed to further explore CS, which can be grouped together as 'cold spray +' hybrid processes (laser, shot peening and friction stir processing). This review will summarise the state-of-the-art of the 'cold spray +' processes to show their abilities and their effectiveness. Recommendations for further research and development have been incorporated to help widespread the process.

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“…В более ранних работах некоторые компьютерные программы использовались при моделировании процессов РСП и РК. Например, в [14] рассмотрено влияние горячей РСП на микроструктуру титановых сплавов с помощью пакета LS-DYNA. Авторами [15] использована трехмерная модель конечных элементов на основе программного обеспечения QForm для изучения градиентной структуры.…”

Section: Introductionunclassified

Influence of the combined radial shear rolling and rotary forging on the stress-strain state of the small diameter bar stock of titanium-based alloys

Xuan¹,

Sheremetyev²,

Kudryashova³

et al. 2020

Izv.VUZ. Tsvet. Met.

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Работа посвящена конечно-элементному моделированию напряженно-деформированного состояния прутковой заготовки малого диаметра при горячей обработке давлением в комбинации радиально-сдвиговой прокатки (РСП) и ротационной ковки (РК). Моделирование выполнено с использованием реологической модели титанового сплава Ti-6Al-4V с помощью программы QForm VX. Смоделировано сочетание радиально-сдвиговой прокатки за 1 проход заготовки диаметром 15 мм на пруток диаметром 12 мм и последующей ротационной ковки в 1, 2 и 3 прохода с получением прутков диаметрами 11, 10 и 8 мм. Учитывалось пооперационное накопление пластической деформации в условиях неравномерности ее распределения. Получены промежуточные и конечные поля пластической деформации, скорости деформации и среднего напряжения. Показано, что распределение пластической деформации после РСП имеет выраженную градиентность с максимальным значением (3 и более) на периферии сечения и минимальным (около 1) в центре. В результате РК даже с небольшими обжатиями напряженно-деформированное состояние становится существенно более однородным по сравнению с заготовкой такого же диаметра только после радиально-сдвиговой прокатки. Кроме того, уменьшаются остаточные напряжения растяжения из-за сжимающих напряжений при ротационной ковке. Прямое экспериментальное опробование комбинированного способа деформации проведено для перспективного сплава Ti-Zr-Nb с памятью формы медицинского назначения при изготовлении прутков диаметром 7-8 мм в условиях опытно-промышленного производства. Получено качественное подтверждение результатов моделирования металлографическим анализом. Показана перспективность сочетания радиально-сдвиговой прокатки и ротационной ковки для создания индустриальных технологий изготовления прутков малого диаметра с высокой однородностью мелкодисперсной структуры.

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Effect of hot rolling by screw mill on microstructure of a Ti-6Al-4V titanium alloy

Cited by 18 publications

References 12 publications

Skew Rolling of Rods from Scrap Rail Heads

Skew Rolling of Rods from Scrap Rail Heads

‘Cold spray +’ as a new hybrid additive manufacturing technology: a literature review

Influence of the combined radial shear rolling and rotary forging on the stress-strain state of the small diameter bar stock of titanium-based alloys

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