Hot workability of burn resistant Ti–35V–15Cr–0.3Si–0.1C alloy

Zhang, S.; Zeng, Weidong; Zhou, Dadi; Lai, Yunjin

doi:10.1179/1743284715y.0000000114

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…Figure 2 shows the true stress-true strain lines of Ti-6Mo-5V-3Al-2Fe alloy at the temperature of 700-900 • C and the strain rates of 5 × 10 −1 to 5 × 10 −4 s −1 . As shown in the figure, the flow stress was affected by deformation temperature and strain rate [14]. At the initial stage of deformation, the true stress increased rapidly, and the curve slope was large.…”

Section: True Stress-true Strain Curvementioning

confidence: 93%

Thermal Deformation Behavior of Ti-6Mo-5V-3Al-2Fe Alloy

et al. 2021

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The Gleeble-3800 thermal simulation machine was used to perform hot compression experiments on a new type of β alloy, Ti-6Mo-5V-3Al-2Fe (wt.%), at temperatures of 700–900 °C, strain rates of 5 × 10−1 to 5 × 10−4 s−1, and total strain of 0.7. Transmission and EBSD techniques were used to observe the microstructure. The results show that the deformation activation energy of the alloy was 356.719 KJ/mol, and dynamic recrystallization occurred during the hot deformation. The higher the deformation temperature was, the more obvious the dislocations that occurred and the more sufficient the dynamic recrystallization that occurred, but the effect of strain rate was the opposite. When the deformation temperature was higher than the phase transition point, the recrystallized grains clearly grew up. The calculated strain rate sensitivity index of the alloy was 0.14–0.29. The constitutive equation of hot deformation of Ti-6Mo-5V-3Al-2Fe alloy was established by using the Arrhenius hyperbolic sine equation. The dynamic DMM hot working diagram with the strain of 0.7 was constructed. The relatively good hot working area of the alloy was determined to be the deformation temperature of 700–720 °C and 0.0041–0.0005 s−1.

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Section: True Stress-true Strain Curvementioning

confidence: 93%

Thermal Deformation Behavior of Ti-6Mo-5V-3Al-2Fe Alloy

et al. 2021

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“…Ti-V-Cr alloys are represented using β-Ti alloys Alloy C (Ti-35V-15Cr) [4] and Ti40 (Ti-25V-15Cr-0.2Si) [5]. V and Cr increase the cost of Ti-V-Cr alloy, reduce the specific strength, and increase the difficulty of smelting and hot working [2]. Under high temperatures and long-term working conditions, V and Cr cannot stabilize the β phase and prevent the precipitation of the α phase, thereby making its thermal stability difficult to meet the needs of wider applications.…”

Section: Burn Resistant Ti Alloysmentioning

confidence: 99%

“…Hence, two strategies are proposed, which include: (1) to improve the compactness of Ti-based coating, which can be achieved by optimizing spraying process parameters [57], adding a hard reinforcing phase [58], and in-situ shot peening [59]; (2) to use its porous structures to develop functional surfaces, such as artificial tooth roots, implants such as hip and knee joints, etc [60]. As the Cu particles that are completely deformed fill the gaps of Ti particles to obtain a compacted coating structure, the method of the cold spray of Ti-Cu mixed powder is more appropriate for preparing Ti-Cu bimetallic precursor coating.…”

Section: The Opportunity Of Cold Spray For Fabricating Burn-resistant...mentioning

confidence: 99%

“…However, under certain conditions of temperature, pressure, and airflow speed, Ti alloys can suffer from high-temperature friction and spontaneous combustion, known as "titanium fire" [1]. Currently, the hottest components of turbine engine compressors are made of Ni-based alloys, which are nearly twice as dense as Ti alloys [1,2]. This creates problems related to thermal expansion and connection technology, hindering engine lightweight.…”

Section: Introductionmentioning

confidence: 99%

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Perspectives on Developing Burn Resistant Titanium Based Coatings—An Opportunity for Cold Spraying

Liang,

Tang,

Wang

et al. 2023

Materials

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Titanium alloys are crucial lightweight materials; however, they are susceptible to spontaneous combustion under high-temperature and high-pressure conditions, limiting their widespread use in aerospace engines. Improving the burn resistance of Ti alloys is essential for the structural safety and lightweight of aerospace equipment. Burn-resistant Ti alloys, such as Ti-V-Cr and Ti-Cu, however, face limitations such as high cost and low specific strength. Surface coatings provide a cost-effective solution while maintaining the high specific strength and good processability of the base material. Conventional surface treatments, such as laser cladding, result in defects and deformation of thin-walled parts. Cold spray technology offers a promising solution, as it uses kinetic energy to deposit coatings at low temperatures, avoiding defects and deformation. In this paper, we review the current research on burn-resistant surface technologies of Ti alloys and propose a new method of bimetallic coating by cold spraying and low-temperature heat treatment, which has the potential to solve the problem of spontaneous combustion of aerospace engine parts. The strategy presented can also guide the development of high-performance intermetallic compound-strengthened metal matrix composite coatings.

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“…Therefore, the enhancement of hardness and wear resistance of the 304 stainless steels is quite necessary. Recently, there has been a growing interest in the fabrication of surface layers of HEAs on stainless steel [30][31][32]. The hardness and wear resistance of stainless steel can be improved by coating HEA on its surface.…”

mentioning

confidence: 99%

Microstructure and Mechanical Properties Investigation of the CoCrFeNiNbx High Entropy Alloy Coatings

Jiang

Cao

2018

Crystals

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In this work, the CoCrFeNiNb x (x: molar ratio, x = 0.45, 0.5, 0.75, and 1.0) high entropy alloy coatings were synthesized on a 304 stainless steel substrate by laser cladding to investigate the effect of Nb element on their microstructure, hardness, and wear resistance. The results indicated that in all of the CoCrFeNiNb x alloy coatings, two phases were found: One was a face-centered cubic (FCC) solid solution phase, the other was a Co 1.92 Nb 1.08 -type Laves phase. The microstructures of samples varied from hypoeutectic structure (x = 0.45 and 0.5) to hypereutectic structure (x = 0.75 and 1.0). The Vickers hardness of CoCrFeNiNb x alloy coatings was obviously improved compared with the substrate. The hardness value of the CoCrFeNiNb 1.0 alloy coating reached to 590 HV, which was 2.8 times higher than that of the substrate. There was also a corresponding variation in wear properties with hardness evolutions. Wherein the hypereutectic CoCrFeNiNb 1.0 alloy coating with the highest hardness exhibited the best wear resistance under the same wear condition, the dry wear test showed the wear mass loss of CoCrFeNiNb 1.0 alloy coating was less than a third of the substrate. The high hardness and wear resistance properties were considered with the fine lamellar eutectic structure and proper combination of FCC and Laves phases.Crystals 2018, 8, 409 2 of 11 superconductivity [24,25], soft magnetism [26,27], etc. As a result, HEAs can be an attractive material for a range of applications. However, the cost of HEAs is higher than that of conventional alloys because of the expensive high-purity raw materials. To reduce the cost, the HEA coatings obtained by laser cladding with advanced properties continue to be in great demand. At present, laser cladding as a surface coating method has been the subject of extensive research [28,29]. Advantages of laser cladding are the integrity of the fusion bond between the cladding coating and substrate, smaller thermal effects on the substrate, high process flexibility, high working speeds, and environmental protection. Moreover, the rapid solidification of laser cladding results in the finer microstructure and extended solid solution, in addition to the high-performance surface with enhanced properties. Stainless steels are widely used in industry and daily life due to their high corrosion, oxidation resistance, and workability. However, its low hardness and wear resistance are not ideal for practical applications. Therefore, the enhancement of hardness and wear resistance of the 304 stainless steels is quite necessary. Recently, there has been a growing interest in the fabrication of surface layers of HEAs on stainless steel [30][31][32]. The hardness and wear resistance of stainless steel can be improved by coating HEA on its surface. For example, FeCoCrAlNi HEA coating [33] prepared by laser cladding on 304 stainless steel possessed high hardness, which was~three times higher than that of the substrate. FeNiCoSiCrAlTi HEA coating [34] prepared by laser cladding on Q235 steel showed ...

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Hot workability of burn resistant Ti–35V–15Cr–0.3Si–0.1C alloy

Cited by 8 publications

References 29 publications

Thermal Deformation Behavior of Ti-6Mo-5V-3Al-2Fe Alloy

Thermal Deformation Behavior of Ti-6Mo-5V-3Al-2Fe Alloy

Perspectives on Developing Burn Resistant Titanium Based Coatings—An Opportunity for Cold Spraying

Microstructure and Mechanical Properties Investigation of the CoCrFeNiNbx High Entropy Alloy Coatings

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