Investigation of the Role of Intermetallic Phases in Microstructure of UFG Titanium VT8M-1 Alloy

Yakovleva, T. V.; D’yakonov, G. S.; Stotskiy, Andrey; Modina, Iuliia M.; Semenova, Irina P.

doi:10.4028/www.scientific.net/msf.1016.1659

Cited by 3 publications

(7 citation statements)

References 12 publications

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“…It appears they made an additional contribution via the precipitation mechanism of strengthening into the total strength after SPD processing ( Figure ). [ 43 ]…”

Section: Producing Ufg Structural States In Titanium Alloys By Spdmentioning

confidence: 99%

“…In the third area, special attention is paid to enhancing the performance properties of UFG Ti alloys, such as low‐cycle and high‐cycle fatigue resistance, impact toughness, crack resistance, long‐term strength, and corrosion resistance. [ 5–8,40–43,45–53 ] Several recent studies have shown that the UFG structure formation in metals and alloys often noticeably reduces both the impact toughness and fracture toughness. For example, such a tendency was observed in nanostructured pure metals, such as Ni, Fe, and Ti, and the effect was attributed to the reduced capacity of UFG metals for strain hardening.…”

Section: Producing Ufg Structural States In Titanium Alloys By Spdmentioning

confidence: 99%

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Advanced Materials for Mechanical Engineering: Ultrafine‐Grained Alloys with Multilayer Coatings

et al. 2021

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Research has demonstrated that the formation of a bulk ultrafine‐grained (UFG) structure in metals and alloys through severe plastic deformation (SPD) enables increasing of their strength properties and decreasing of the temperature range of superplasticity. Designers and process engineers generally show a great interest in such materials because the development of mechanical engineering industries places ever‐increasing demands on the performance properties of commercial alloys, especially for parts operating under extreme conditions. One of the approaches for a comprehensive enhancement of the performance characteristics of structural materials is a combination of a UFG structure in the bulk of a material, providing an increase in strength, and an additional surface modification providing resistance to erosion and corrosion damage. As a result, a set of material service properties can be enhanced, which is difficult to achieve through only metal nanostructuring or only surface modification. This approach has been demonstrated through an example of UFG titanium alloys produced by SPD, including those with nanostructured multilayer TiVN coatings of different “architectures.” Accordingly, herein, the trends, problems, and prospects of surface modification for the innovative application of structural UFG titanium alloys in advanced mechanical engineering are examined.

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“…It appears they made an additional contribution via the precipitation mechanism of strengthening into the total strength after SPD processing ( Figure ). [ 43 ]…”

Section: Producing Ufg Structural States In Titanium Alloys By Spdmentioning

confidence: 99%

Section: Producing Ufg Structural States In Titanium Alloys By Spdmentioning

confidence: 99%

Advanced Materials for Mechanical Engineering: Ultrafine‐Grained Alloys with Multilayer Coatings

et al. 2021

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“…With regard to the VT8M-1 alloy, there are several studies in this direction [22][23][24][25]. In several works [22,23], ultrafine-grained workpieces with an average grain size of ~0.5 µm and a good combination of strength and ductility were obtained by equal-channel angular pressing (ECAP).…”

Section: Introductionmentioning

confidence: 99%

Microstructure of the Advanced Titanium Alloy VT8M-1 Subjected to Rotary Swaging

Dyakonov,

Yakovleva,

Mironov

et al. 2023

Materials

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In this study, the microstructural behavior of the advanced Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn-0.15Si (VT8M-1) alloy during rotary swaging (RS) was investigated. VT8M-1 has increased heat resistance and is considered a replacement for the Ti-6Al-4V alloy. It was shown that, during RS, the evolution of the primary a phase is characterized by the formation of predominantly low-angle boundaries according to the mechanism of continuous dynamic recrystallization. The density of low-angle boundaries increases three times: from 0.38 µm−1 to 1.21 µm−1 after RS. The process of spheroidization of the lamellar (a + b) component is incomplete. The average size of globular a and b particles was 0.3 μm (TEM). It is shown that the microstructures after RS (ε = 1.56) and equal-channel angular pressing (ECAP) (ε = 1.4) are significantly different. The temperature–velocity regime and the predominance of shear deformations during ECAP contributed to a noticeable refinement of the primary a-phase and a more complete development of globularization of the lamellar (a+b) component. EBSD studies have shown that RS leads to the formation of a structure with a higher density of low- and high-angle boundaries compared to the structure after ECAP. The results are useful for predicting alloy microstructure in the production of long rods that are further used in forging operations.

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“…[ 18 ] Our recent articles show that an UFG structure can be successfully produced in this alloy by equal‐channel angular pressing (ECAP), and this enables enhancing considerably the alloy's mechanical properties at room and operating temperatures. [ 18–21 ]…”

Section: Introductionmentioning

confidence: 99%

“…[18] Our recent articles show that an UFG structure can be successfully produced in this alloy by equal-channel angular pressing (ECAP), and this enables enhancing considerably the alloy's mechanical properties at room and operating temperatures. [18][19][20][21] The aim of this work is to study the mechanical behavior of the VT8M-1 alloy processed by ECAP during compression tests in a temperature range of 650-800 C, as well as to evaluate the degradation of the UFG structure and its response to the mechanical properties of the billet during a physical experiment imitating isothermal forging at 700 C. Corporation (Russia) was selected as the material for the study. The rod's chemical composition is presented in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Superplastic‐Like Behavior and Enhanced Strength of a Two‐Phase Titanium Alloy with Ultrafine Grains

et al. 2022

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Here, the two‐phase titanium alloy Ti‐5.7Al‐3.8Mo‐1.2Zr‐1.3Sn (Russian name VT8M‐1) with an ultrafine‐grained (UFG) structure is successfully produced by equal‐channel angular pressing (ECAP). This UFG alloy demonstrates a significant increase in strength at room temperature (RT) and superplastic‐like behavior during compression at elevated temperatures in a range of 650–800 °C. This unusual behavior is used in this work to study the forging of the alloy at 700 °C, which simulates the process of making an aircraft engine blade. It is shown that after this forging the alloy has significantly higher strength properties than after standard processing. The origin of such superior behavior of this UFG alloy is discussed.

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Investigation of the Role of Intermetallic Phases in Microstructure of UFG Titanium VT8M-1 Alloy

Cited by 3 publications

References 12 publications

Advanced Materials for Mechanical Engineering: Ultrafine‐Grained Alloys with Multilayer Coatings

Advanced Materials for Mechanical Engineering: Ultrafine‐Grained Alloys with Multilayer Coatings

Microstructure of the Advanced Titanium Alloy VT8M-1 Subjected to Rotary Swaging

Superplastic‐Like Behavior and Enhanced Strength of a Two‐Phase Titanium Alloy with Ultrafine Grains

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