High temperature oxidation and hot corrosion behaviors of Ti2AlNb alloy at 923 K and 1023 K

Dai, Jingjie; Sun, Changzheng; Wang, Amin; Zhang, Hongxia; Li, Shouying; Zhang, Hailong

doi:10.1016/j.corsci.2021.109336

Cited by 37 publications

(18 citation statements)

References 16 publications

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“…They found that TiO2 and Al2O3 were the main constituent phases of the oxide layer. Dai et al [24] reported that the Cl2 product formed during the hot salt corrosion test of the Ti2AlNb alloy, which further reacted with the substrate to produce volatile chlorides that resulted in severe cracking of the oxide layer. Wang et al [14] investigated the oxidation behavior of Ti6Al4V in water vapor at 600-800 °C.…”

Section: Methodsmentioning

confidence: 99%

“…Aca et al [13] investigated the oxidation behavior of the Ti alloy at 500-600 • C. They found that TiO 2 and Al 2 O 3 were the main constituent phases of the oxide layer. Dai et al [24] reported that the Cl 2 product formed during the hot salt corrosion test of the Ti2AlNb alloy, which further reacted with the substrate to produce volatile chlorides that resulted in severe cracking of the oxide layer. Wang et al [14] investigated the oxidation behavior of Ti6Al4V in water vapor at 600-800 • C. The results show that the surface of the sample appeared to be dominated by alumina and rutile phases, and the hardness increased significantly with the increasing temperature.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Degradation Behaviors of Ti6Al4V Alloys in Simulated Marine Environments

et al. 2022

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Detailed tests and characterizations were used to investigate the corrosion degradation behaviors of Ti6Al4V alloys in simulated marine environments. These alloys suffered from very slight pitting and a miniscule weight loss of 0.018 mg/cm2 during the 50 cycle salt spray exposure but experienced significant oxygen erosion in the high-temperature oxidation test, resulting in a high weight gain of 2.657 mg/cm2 at 400 h. The oxidation and degradation reactions simultaneously occurred during the high-temperature hot salt test. The chlorine (Cl2) induced by the eutectic reaction of the mixed salts accelerated the degradation of the substrate and led to a higher weight gain of 4.265 mg/cm2 at 400 h. In contrast, this alloy suffered from severe corrosion damage during the high-temperature hot salt–water vapor synergy test. The degradation of TiO2, Al2O3, and V2O5 was aggravated by the synergistic action of chlorine salt and water. The reaction forming hydrochloric acid (HCl) further degraded the matrix metal and consequently led to a high weight loss of 16.358 mg/cm2 at 400 h. These current findings provide a comprehensive understanding for the degradation mechanisms of Ti alloys in these specific marine environments.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion Degradation Behaviors of Ti6Al4V Alloys in Simulated Marine Environments

et al. 2022

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“…At 900 and 700°C oxidation temperature has a parabolic rate law where products composed of discontinuous alumina in the outer part a. This layer is composed mostly of TiO 2 due to the high internal diffusion of oxygen through the oxide layer 20 .…”

Section: Analysis Of Oxidized Specimensmentioning

confidence: 99%

“…Oxygen may reach alloys more rapidly by producing substituted volatile chlorides, leading the corrosion product to split 16,17 . The current research topics for titanium alloys in aviation include high-temperature oxidation and hot corrosion properties [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

“…According to researcher 19 , titanium alloy was exposed to considerable oxidation erosion during hightemperature exposure, resulting in an oxygen-rich layer under the top TiO 2 layer, inducing oxygen embrittlement and mechanical failure. According to Dai et al 20 ., Ti 2 AlNb alloy displayed excellent resistance to hot corrosion at 650°C but was highly detrimental at 750°C. They reported that at 650°C, the solid salt lm slightly interacted with TiO 2 , but at 750°C, it converted into a molten salt lm.…”

Section: Introductionmentioning

confidence: 99%

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Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

Ahmed

El-Zomor

Ghazala

et al. 2022

Preprint

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In the current study on TC21 Ti-alloy (6.5Al-3Mo-1.9Nb-2.2Sn-2.2Zr-1.5Cr), the thermal oxidation formed oxide layers that considerably influenced mechanical properties (hardness and wear). The corrosion of raw and oxidized specimen by NaCl-induced hot salt was also examined. TC21 alloy specimens were oxidized at 600, 700, 800, and 900°C for 5, 20, and 50 h. Salt spray test was utilized on raw and oxidized (600°C /50 h & 800°C/50 h) specimens of salt corrosion evaluated at 600°C for cycling 5, 10, 20, 30, 40, and 50 h. Average thickness of the layer grew with increasing oxidation time and temperature. Thin oxide layer (average 0.16 µm) was generated by oxidation temperature at 600°C duration 5 h. at 800°C oxide layer thickness was 10.8 µm large layer. Most significant surface hardness was 1108 HV0.5 which is produced for an oxidized layer at 900°C. However, lowest hardness of 360 HV0.5 was recorded for raw materials. The best wear resistance had at 800°C specimens, while raw ones had the lowest. During NaCl hot corrosion test, weight loss of the raw specimen was 6.4 mg/cm2 because the corrosion product was flaking off. However, for oxidized at 600°C for 50 h, weight loss after corrosion testing was 0.54 mg/cm2, which was less than that of specimen before corrosion. Oxidized specimens at 800 exhibited the best mechanical characteristics and corrosion resistance.

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Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

Hariharan¹,

Anderson²,

Ravikumar³

2022

Recent Advances in Thermofluids and Manufacturing Engineering

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High temperature oxidation and hot corrosion behaviors of Ti2AlNb alloy at 923 K and 1023 K

Cited by 37 publications

References 16 publications

Corrosion Degradation Behaviors of Ti6Al4V Alloys in Simulated Marine Environments

Corrosion Degradation Behaviors of Ti6Al4V Alloys in Simulated Marine Environments

Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

Hot Corrosion Behaviour of Incoloy 800H Superalloy with Various Molten Salts Environment

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