Thermal stability and creep behavior of Ti–V–Cr burn-resistant alloys

Zhao, Yongqing; Qu, Heng Lei; Wang, M.M.; Wu, Huawei; Zhu, Kai

doi:10.1016/j.jallcom.2005.06.014

Cited by 23 publications

(8 citation statements)

References 10 publications

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“…Specifically, the content of low ΣCSL boundaries is 15.23% under water cooling, while 21.2% at the cooling rate of 1 • C/min. According to the theoretical basis of grain boundary engineering, the content of the special grain boundary (generally refers to the low ΣCSL grain boundary with Σ ≤ 29) [28,29] can significantly improve the properties related to the grain boundary, especially the creep property [30][31][32]. In conclusion, the decreasing cooling rate can increase the content of the low ΣCSL boundaries and thereby enhance the mechanical properties, especially the creep property.…”

Section: Discussionmentioning

confidence: 99%

Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

et al. 2021

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The formation of the irregular γ′ precipitates in the nickel-based superalloy Waspaloy was investigated during the continuous cooling, which is relevant to the cooling rates and interrupted temperature. The morphology of the γ′ precipitates was observed to change from a dispersed sphere to the flower-like one with the decreasing of the cooling rates. It was found that there are three modes of transportation of the solute atoms involved in relation to the γ′ precipitates: dissolution from the small γ′ precipitates to the γ matrix, diffusion to the large γ′ precipitates from the matrix, and the short distance among γ′ precipitates close to each other. Meanwhile, the slower cooling rates tend to result in the serrated grain boundaries, and the wavelength between successive peaks (λ) and the maximum amplitude (A) are larger with the decreasing of the cooling rates. The content of the low ΣCSL boundaries increases with the decreasing of the cooling rates, which is of great benefit in improving the creep property of the Waspaloy.

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Section: Discussionmentioning

confidence: 99%

Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

et al. 2021

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“…(Ti-25V-15Cr-0.2Si, wt%) is chosen for research on the basis of previous results [9][10][11][12][13]. The Ti40 alloy is a type of highly stabilized b burn-resistant titanium alloy with a Mo-equivalency of 39.…”

Section: Introductionmentioning

confidence: 99%

“…The service conditions for burn-resistant titanium alloys in aero-engines require that the Ti40 alloy can be used at temperatures higher than 500 1C. Therefore, the creep behavior and thermal stability are key topics of interest for burn-resistant titanium, although some progress on the creep behavior of Ti40 alloys has been made in the author's previous works [12,13]. The effect of different microstructure morphologies on the creep behavior is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Role of grain boundaries in the high-temperature performance of a highly stabilized beta titanium alloy II: Creep behavior

Xin

Zhang

et al. 2013

Materials Science and Engineering: A

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“…Ti25V15Cr2Al0?2C (BuRTi) represents a family of burn resistant titanium alloys developed in the 1990s. 1,2 The propensity for titanium fire in these b phase alloys has been reduced through large additions of chromium and vanadium. Extruded BuRTi has been well studied 3,4 and is now being engine tested.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of hot isostatically pressed powder and extruded Ti25V15Cr2Al0·2C

Jiang

Zhang

García-Pastor

et al. 2011

Materials Science and Technology

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The influence of process route on the microstructure and tensile behaviour of specimens prepared from hot isostatically pressed powders and extruded ingot of the burn resistant alloy, Ti-25V-15Cr-2Al-0?2C (wt-%), has been investigated. Samples based on gas atomised (GA) and plasma rotating electrode process (PREP) powders have been studied. Microstructural examination shows that many PREP powder particles are single crystals, whereas GA particles are polycrystalline. The mechanical properties of hot isostatically pressed specimens have been assessed using tensile testing monitored by acoustic emission, while microstructures have been characterised by synchrotron X-ray microtomography and optical and analytical scanning electron microscopy. Tomographic examination revealed a small fraction (,0?002 vol.-%) of pores in samples made from hot isostatically pressed GA powders, but no porosity was detected in samples made from hot isostatically pressed PREP powder. In view of their similar tensile behaviour, it is concluded therefore that the porosity does not contribute to the scatter and poor ductility in these hot isostatically pressed samples. These pores increased in size and volume fraction after heat treatment above the hot isostatic press temperature. The large scatter in tensile properties of both hot isostatically pressed GA and PREP samples was correlated with the presence of large (100-400 mm) circular crack initiation sites on the fracture surfaces, but the origin of these initiation sites has not been identified.

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Thermal stability and creep behavior of Ti–V–Cr burn-resistant alloys

Cited by 23 publications

References 10 publications

Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

Study on the Evolution of the γ′ Phase and Grain Boundaries in Nickel-Based Superalloy during Interrupted Continuous Cooling

Role of grain boundaries in the high-temperature performance of a highly stabilized beta titanium alloy II: Creep behavior

Microstructure and properties of hot isostatically pressed powder and extruded Ti25V15Cr2Al0·2C

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