Effect of heat treatment on the corrosion resistance behavior of selective laser melted Ti6Al4V ELI

Yan, Xingchen; Shi, Chunbao; Liu, Taikai; Ye, Yun; Cheng, Ching-An; Ma, Wanbiao; Deng, Chunming; Yin, Shuo; Liao, Hanlin; Liu, Min

doi:10.1016/j.surfcoat.2020.125955

Cited by 36 publications

(8 citation statements)

References 26 publications

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“…The formation of this film prevents further electron transfer between the solution and the electrodes, thus gradually increasing the OCP value. [ 40 ] The sample heat‐treated at 850 °C shows the most negative OCP, followed by the 0‐sample. In contrast, the 750‐sample has the most positive OCP, followed by the 700‐sample.…”

Section: Resultsmentioning

confidence: 99%

Passivation Behavior of Water‐Quenched and Heat‐Treated Ti–6Al–4V in Hank's Solution

Jin

Zhang

et al. 2023

Adv Eng Mater

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Ti‐6Al‐4V is a prevalent material utilized in various industrial applications, and its microstructure modification commences with quenching, followed by diverse heat treatments. Although many works have concentrated on the mechanical properties of Ti‐6Al‐4V with tailored microstructures resulting from heat treatments, their corresponding corrosion behavior still lacks attention. This study investigates the corrosion behavior of water‐quenched Ti‐6Al‐4V that undergoes heat treatment between 700 °C and 850 °C in Hank’s solution. Various electrochemical methods, such as open circuit potential tests, potentiodynamic/potentiostatic polarization, electrochemical impedance spectroscopy, and Mott‐Schottky tests, were jointly employed. The water‐quenched Ti‐6Al‐4V displays a quick‐cooling microstructure with a plentiful amount of martensite α/α' phase. Heat treatment at 700 °C significantly alters the microstructures of the samples. Due to competitive factors, heat treatment at low temperatures results in uneven alloy composition, leading to poor uniformity of the passive film. At this phase, negative effects dominate, and the corrosion resistance of the samples deteriorates. When the heat treatment temperature increases to 850 °C, the content of β phase, which possesses better corrosion resistance, increases and becomes dominant. Consequently, the corrosion resistance of the samples improves in Hank’s solution.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Passivation Behavior of Water‐Quenched and Heat‐Treated Ti–6Al–4V in Hank's Solution

Jin

Zhang

et al. 2023

Adv Eng Mater

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“…As reported in previous studies, superficial roughness found in as-built AM parts is related to the presence of partially melted powder and could increase the corrosion at the surface, but it does not affect the growth on the Oxygen Diffusion Zone (ODZ) [ 21 , 22 , 23 , 24 , 25 , 26 ]. Internal porosity and high surface roughness of alloys could lead to fatigue failure; which necessitates the need to apply post-heat treatments and surface machining in order to reduce the porosity and surface roughness of AM parts [ 2 ].…”

Section: Introductionmentioning

confidence: 98%

“…Internal porosity and high surface roughness of alloys could lead to fatigue failure; which necessitates the need to apply post-heat treatments and surface machining in order to reduce the porosity and surface roughness of AM parts [ 2 ]. Hot Isostatic Pressing (HIP), Annealing Vacuum (AV), and Laser Shock Processing (LSP) are some of the most commonly used post-treatments to reduce the consequence of defects on the mechanical and corrosion resistance properties through the reduction in residual stress and microstructure transformations [ 11 , 24 , 25 , 26 , 27 ]. For instance, Hua et al (2015) found that LSP reduces the oxidation velocity of alloy Ti-6Al-4V at 900 °C by temperatures of 50% [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing

et al. 2023

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New manufacturing processes for metal parts such as additive manufacturing (AM) provide a technological development for the aeronautical and aerospace industries, since these AM processes are a means to reduce the weight of the parts, which generate cost savings. AM techniques such as Laser Powder Bed Fusions (LPBF) and Electron Beam Fusion (EBM), provided an improvement in mechanical properties, corrosion resistance, and thermal stability at temperatures below 400 °C, in comparison to conventional methods. This research aimed to study the oxidation kinetics of Ti-6Al-4V alloys by conventional and Electron Beam Additive Manufacturing. The thermogravimetric analysis was performed at temperatures of 600 °C, 800 °C, and 900 °C, having a heating rate of 25 °C/min and oxidation time of 24 h. The microstructural analysis was carried out by thermogravimetric analysis. Thickness and morphology of oxide layers were analyzed by field emission scanning electron microscope, phase identification (before and after the oxidation process) was realized by X-ray diffraction at room temperature and hardness measurements were made in cross section. Results indicated that the oxidation kinetics of Ti-6Al-4V alloys fabricated by EBM was similar to conventional processing and obeyed a parabolic or quasi-parabolic kinetics. The samples oxidized at 600 °C for 24 h presented the lowest hardness values (from 350 to 470 HV). At oxidation temperatures of 800 and 900 °C, however, highest hardness values (from 870 close to the alpha-case interface up to 300 HV in base metal) were found on the surface and gradually decreased towards the center of the base alloy. This may be explained by different microstructures presented in the manufacturing processes.

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“…The common method used to improve the oxidation resistance of titanium alloys mainly includes surface treatment and alloying by the addition of elements to improve the properties of the alloy, such as Mn, Nb, B, and Y [ 11 , 12 ]. Some common surface treatment methods mainly include coatings and laser shock processing (LSP) [ 13 ]. Compared with surface treatments, alloying is more suitable for an AM process.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation Behavior of Additive Manufactured Ti6Al4V Alloy with the Addition of Yttrium Oxide Nanoparticles

Wang,

Song,

Niu

et al. 2024

Materials

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Titanium alloys face challenges of high temperature oxidation during the service period when used as aircraft engine components. In this paper, the effect of Y2O3 addition on the oxidation behavior and the microstructural change of the Ti6Al4V alloy fabricated by selective laser melting (SLM) was comprehensively studied. The results show that the surface of the Ti6Al4V alloy is a dense oxide layer composed of TiO2 and Al2O3 compounds. The thickness of the oxide layer of the Ti6Al4V increased from 59.55 μm to 139.15 μm. In contrast, with the addition of Y2O3, the thickness of the oxide layer increased from 35.73 μm to 80.34 μm. This indicates that the thickness of the oxide layer formation was a diffusion-controlled process and, therefore, the thickness of the oxide layer increased with an increase in temperature. The Ti6Al4V-1.0 wt.% Y2O3 alloy exhibits excellent oxidation resistance, and the thickness is significantly lower than that of the Ti6Al4V alloy. The oxidation kinetics of the Ti6Al4V and Ti6Al4V-1.0 wt.% Y2O3 alloys at 600 °C and 800 °C follows a parabolic rule, whereas the oxidation of the Ti6Al4V and Ti6Al4V-1.0 wt.% Y2O3 alloys at 1000 °C follows the linear law. The average microhardness values of Ti6Al4V samples after oxidation increased to 818.9 ± 20 HV0.5 with increasing temperature, and the average microhardness values of the Ti6Al4V-1.0 wt.% Y2O3 alloy increases until 800 °C and then decreases at 1000 °C. The addition of Y2O3 shows a significant improvement in the microhardness during the different temperatures after oxidation.

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Effect of heat treatment on the corrosion resistance behavior of selective laser melted Ti6Al4V ELI

Cited by 36 publications

References 26 publications

Passivation Behavior of Water‐Quenched and Heat‐Treated Ti–6Al–4V in Hank's Solution

Passivation Behavior of Water‐Quenched and Heat‐Treated Ti–6Al–4V in Hank's Solution

Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing

High Temperature Oxidation Behavior of Additive Manufactured Ti6Al4V Alloy with the Addition of Yttrium Oxide Nanoparticles

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