The effect of different heat treatment cycle on hot corrosion and oxidation behavior of Ti–6Al–4V

Sharifi, Farzaneh; Abouei, V.; Alizadeh, Ali; Shajari, Y.; Porhonar, Mohammad; Ghanbari, M.; Ravari, B. Karbakhsh

doi:10.1088/2053-1591/ab4cb4

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…The mass gains of the coated samples are much lower than that of the uncoated sample. After 40 h of oxidation, the sample failed due to the peeling of the surface [21]. The weight gain of the coating is mainly determined by chemical reaction and atomic diffusion.…”

Section: Comparison Of Oxidation Resistancementioning

confidence: 99%

High temperature oxidation behaviour of mono-layer and bi-layer coatings

Guo

Shen

Feng

et al. 2020

Surface Engineering

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In the current work, the mono-layer Al-Cr-Ni coating and the bi-layer Al-Ni/Al-Cr coating were successfully synthesised on the Ti-6Al-4V alloy substrate by mechanical alloying. The effect of powder ratio was studied. The microstructure and phase composition of the two coatings were investigated. The mono-layer coating was composed of grey black composite structure. In the bi-layer coating, the Al-Cr outer layer exhibited a composite structure similar to the Al-Cr-Ni coating. The results showed the approximate thickness of Al-Cr-Ni coating was 140 μm, while that of bi-layer coating was more than 200 μm. Both coatings were well bonded to the substrate. After 850°C of cyclic oxidation for 100 h, cracks only occurred at the interface of the mono-layer coating, and no significant defects were found at the two interfaces of the bi-layer coating. The cyclic oxidation test results showed the bi-layer coatings exhibited more excellent oxidation resistance.

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Section: Comparison Of Oxidation Resistancementioning

confidence: 99%

High temperature oxidation behaviour of mono-layer and bi-layer coatings

Guo

Shen

Feng

et al. 2020

Surface Engineering

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“…So, the most crucial requirement in the industrial sector is corrosion resistance. Because titanium alloys are exposed to corrosion, oxygen can permeate deep through the metallic substrate to create an oxygen dissolution area, which causes the afflicted area to become more brittle 18 – 20 . Titanium alloys experience hot corrosion in the maritime environment and rapid oxidation over 400 °C in oxygen-containing settings 21 .…”

Section: Introductionmentioning

confidence: 99%

Impact of thermal oxidation parameters on micro-hardness and hot corrosion of Ti-6Al-3Mo-2Nb-2Sn-2Zr-1.5Cr alloy

Ahmed

El-Zomor

Ghazala

et al. 2023

Sci Rep

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Protective oxide layers on Ti-6Al-3Mo-2Nb-2Sn-2Zr-1.5Cr (TC21) alloy with equiaxed microstructure considerably influence micro-hardness and hot corrosion resistance. The present work’s thermal oxidation of TC21 alloy was performed at 600, 700, and 800 °C for 5, 20, and 50 h durations. Hot corrosion methods in NaCl and NaCl + Na2SO4 salt media were applied to raw (unoxidized) and oxidized samples at 600 and 800 °C for 50 h. Hot corrosion was conducted at 600 °C for 5 cycles with 10-h steps. The best oxide layer thickness was observed at 800 °C, which increased with increased oxidation time and temperature. The surface hardness of the oxide layer at 800 °C was 900 ± 60 HV0.05 owing to the formation of TiO2 and Al2O3 phases. Raw material hardness was 342 ± 20 HV0.05, increasing threefold due to thermal oxidation. In the case of NaCl, weight loss dominated all samples except at 800 °C for 5 h. In the case of NaCl + Na2SO4, weight gain occurred at 600 and 800 °C for 5 h. Weight loss occurred for the raw samples and those processed at 800 °C for 20 and 50 h, where the oxide layer flaked off. Surface hardness increased upon hot corrosion testing because of the formation of brittle phases, such as TiO2 and Na4Ti5O12. Samples that oxidized at 800 °C for 5 h had the highest hardness and corrosion resistance.

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“…Ti-6Al-4V is the most widely used titanium alloy in aerospace, biomedicine and the petrochemical industry because of its excellent performance, such as high specific strength, fine corrosion resistance, outstanding tissue compatibility and good weldability [1][2][3][4], and various advanced technologies to further enhance its performances have attracted increasing attention [5][6][7]. Magnetoplastic effects first reported in 1987 [8] are a kind of phenomena that can occur in various materials, including metals [9][10][11][12][13][14], semiconductors [9,10,15,16], ionic crystals [8][9][10][17][18][19], etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Magnetic Field on the Residual Stress and Structural Defects of Ti-6Al-4V

Zhang

Zhao

Cai

et al. 2020

Metals

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In this work, the influences of a magnetic field of 2.4 T on the macro residual stress and the status of structural defects, including grain boundaries, dislocations and the Fe-rich clusters of Ti-6Al-4V were investigated by X-ray Diffraction (XRD), Electron Backscatter Diffraction (EBSD) and magnetic measurement. The XRD test results show that the applied magnetic field can cause the relaxation and homogenization of macro residual stress. The maps of Kernel Average Misorientation (KAM) values obtained by EBSD tests present a significant dislocation multiplication caused by a magnetic field, and the rise of dislocation density was estimated to be about 32% by XRD tests. The EBSD test results also show an increase in the fraction of Coincidence Site Lattice (CSL) grain boundaries and a decrease in the fraction of low-angle grain boundaries. The results of magnetic measurement show that Ti-6Al-4V has mixed magnetism consisting of paramagnetism and weak ferromagnetism, and that the ferromagnetic saturation magnetization decreased after exposing the alloy to the magnetic field, which suggests the dissolution of the Fe-rich clusters in the alloy. These magnetically-induced changes are related to magnetoplastic effects, a kind of phenomena on which there have been some research, and the possible mechanism of them is discussed in this paper.

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The effect of different heat treatment cycle on hot corrosion and oxidation behavior of Ti–6Al–4V

Cited by 7 publications

References 32 publications

High temperature oxidation behaviour of mono-layer and bi-layer coatings

High temperature oxidation behaviour of mono-layer and bi-layer coatings

Impact of thermal oxidation parameters on micro-hardness and hot corrosion of Ti-6Al-3Mo-2Nb-2Sn-2Zr-1.5Cr alloy

Effects of Magnetic Field on the Residual Stress and Structural Defects of Ti-6Al-4V

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