Evolution of microstructure and texture in the stir zone of commercially pure titanium during friction stir processing

Singh, Abhishek Kumar; Kaushik, Lalit; Singh, Jaiveer; Das, Hrishikesh; Mondal, Mounarik; Hong, Sung-Tae; Choi, Shi‐Hoon

doi:10.1016/j.ijplas.2021.103184

Cited by 15 publications

(13 citation statements)

References 67 publications

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“…Неплохую стойкость при сварке титановых сплавов показывают инструменты из вольфрамлантановых и кобальтовых сплавов [18,19]. Широко распространено использование инструментов из карбида вольфрама [20,21].…”

Section: обработка металловunclassified

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Amirov¹,

Moskvichev²,

Иванов³

et al. 2022

Metal Working and Material Science

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Introduction. The technological process of fabrication products from titanium alloys is often complicated by low quality of welded joints during electric arc or gas-flame welding operations due to high residual stresses and deformations. An example of a successful solution to this problem is the development and implementation of such high-tech processes of metal joining as friction stir welding, which does not refer to the methods of fusion joining. Friction stir welding as an advanced technology is used to obtain joints of “soft” metallic materials, such as aluminum. For “hard” metallic materials, friction stir welding has been limited due to the high demands on welding tools. The aim of this work is investigation of the possibility of using a tool made of the nickel-based heat-resistant alloy ZhS6U in friction stir welding of the titanium alloy Ti-5Al-3Mo-1V. Results and discussion. Optical and scanning electron microscopy results revealed that the structure of the weld is typical of this type of welding, gradient, consisting of a heat-affected zone, thermo-mechanical affected zone and a stir zone with a fragmented structure. When varying welding parameters, it is shown that the defectiveness of the weld is affected to a greater extent by the axial load on the tool, which is caused by a significant difference in the thermal effect on the material. Metallographic analysis methods revealed dissolution of welding tool material fragments in the stir zone of the non-detachable joint. Fractographic analysis of the fracture surface shows that the fracture in the weld zone is ductile, although in this case there are brittle bridges. Varying the parameters of friction stir welding made it possible to obtain an indissoluble joint with at least 90 % of the strength of the base metal.

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Section: обработка металловunclassified

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Amirov¹,

Moskvichev²,

Иванов³

et al. 2022

Metal Working and Material Science

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“…Titanium and its alloys are known for their high specific strength, high heat resistance, and high resistance to erosion and corrosion [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Friction Stir Processing (FSP) was derived from friction stir welding (FSW) in 2000 and was first reported by Mishra et al [15].…”

Section: Introductionmentioning

confidence: 99%

“…Because FSP is a severe plastic deformation process, it aims to attain a stir zone with a very fine grain size and hence to improve the mechanical properties of the material being processed. Applying FSW, and hence FSP, to Ti and its alloys is somewhat challenging due to the high melting temperature of titanium (1668 0 C), thus requiring welding tool materials that are more resistant to temperature and wear [3,[7][8][9][10][11][12][13][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies, among them [8][9][10][11][12][13][14]21], have examined the microstructure obtained during FSP of commercially-pure (CP) Ti. Yet these studies are marked by many discrepancies, including the sizes and shapes of the grains as well as the influence of the processing parameters on grain shape and size and the metallurgical processes involved.…”

Section: Introductionmentioning

confidence: 99%

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On Dynamic Recrystallization During Friction Stir Processing of Commercially Pure Ti and Its Influence on the Microstructure and the Mechanical Properties

Regev,

Spigarelli

2024

Preprint

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Friction stir processing (FSP), a severe plastic deformation process, was applied on commercially pure Ti to obtain an improved microstructure. The process yielded a refined microstructure and higher mechanical properties at room temperature (RT). Yet the microstructure was found to contain bright bands demonstrating high hardness values of about 500 HV. High resolution scanning electron microscopy (HRSEM) as well as electron back scattering diffraction (EBSD) analysis indicated that these bands were composed of extra-fine equiaxed α-Ti grains with an average radius of 1-2 microns. In addition, a retained β-phase was detected at the boundaries of these α-Ti grains, together with a small quantity of separate β grains. The results of a fractography study conducted on broken tensile specimens showed that the FSP’ed material was free of defects and that the fracture started at these bands. It is proposed that these bright bands are due to excessive deformation occurring during the processing stage, leading to an accelerated dynamic recrystallization (DRX) process. In turn, these heavy deformation regions act as a strengthening constituent, making the material superior to the parent material as far as its mechanical RT properties are concerned. Consequently, this means that FSP of CP-Ti has the potential to serve as an industrial means of improving the mechanical properties of the material.

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“…The effects of FSP on the microstructure and mechanical properties [11][12][13][14], corrosion/electrochemical behaviour [14][15][16][17], and wear properties [17,18] of CP-Ti have been investigated. According to previous investigations, FSP can significantly improve the surface properties of CP-Ti by promoting the formation of ultrafine grains and increasing the density of dislocations and volume fraction of Widmanstätten structure [15,16,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the tribological properties of pure Ti by pinless friction surface stirring

Ashoori,

Jafarzadegan,

Taghiabadi

et al. 2023

Materials Science and Technology

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Friction surface stirring (FSS) was employed to enhance the tribological properties of commercially pure Ti (CP-Ti). Applying FSS under the optimised process parameters (i.e. rotation and traverse speeds of 100 rpm and 8 mm/min, respectively) was found to increase the surface hardness of as-received CP-Ti from about 200–630 HV. The sliding wear resistance was therefore increased by 76, 76, and 85% under applied loads of 5, 10, and 20 N, respectively. The average friction coefficient (AFC) of CP-Ti also reduced considerably by the FSS. For instance, the AFC was reduced from 0.67 ± 0.07 and 1.04 ± 0.14 to about 0.33 ± 0.03 and 0.45 ± 0.04 at the applied loads of 5 and 20 N, respectively. The wear and friction mechanisms were also discussed.

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Evolution of microstructure and texture in the stir zone of commercially pure titanium during friction stir processing

Cited by 15 publications

References 67 publications

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

On Dynamic Recrystallization During Friction Stir Processing of Commercially Pure Ti and Its Influence on the Microstructure and the Mechanical Properties

Enhancing the tribological properties of pure Ti by pinless friction surface stirring

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