Oxidation kinetics and microstructure evolution of air oxidation behavior of TC18 alloy

Xi, Aiying; Zhuo, Longchao; Shao, Hui; Su, Di; Feng, Shengyu; Lu, Jiping; Ji, Kaile; Chen, Bingqing; Zhao, Xiaohua; Wang, Kaixuan

doi:10.1016/j.vacuum.2022.111332

Cited by 14 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fitting parameters of the alloys at each oxidation temperature are provided in Table 4 . It can be seen that the oxidation reaction index n of the alloy is between 1 and 2, which shows that the oxidation of the alloys is controlled by diffusion process [ 24 , 25 ] and the oxidation weight gain of the alloy follows the linear-parabolic law.…”

Section: Resultsmentioning

confidence: 99%

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Shen

Wang³

et al. 2023

Materials

View full text Add to dashboard Cite

To improve the heat resistance of titanium alloys, the effects of Y content on the precipitation behavior, oxidation resistance and high-temperature mechanical properties of as-cast Ti-5Al-2.75Sn-3Zr-1.5Mo-0.45Si-1W-2Nb-xY (x = 0.1, 0.2, 0.4) alloys were systematically investigated. The microstructures, phase evolution and oxidation scales were characterized by XRD, Laser Raman, XPS, SEM and TEM. The properties were studied by cyclic oxidation as well as room- and high-temperature tensile testing. The results show that the microstructures of the alloys are of the widmanstätten structure with typical basket weave features, and the prior β grain size and α lamellar spacing are refined with the increase of Y content. The precipitates in the alloys mainly include Y2O3 and (TiZr)6Si3 silicide phases. The Y2O3 phase has specific orientation relationships with the α-Ti phase: (002)Y2O3 // (1¯1¯20)α-Ti, [110]Y2O3 // [4¯401]α-Ti. (TiZr)6Si3 has an orientation relationship with the β-Ti phase: (022¯1¯)(TiZr)6Si3 // (011)β-Ti, [1¯21¯6](TiZr)6Si3 // [044¯]β-Ti. The 0.1 wt.% Y composition alloy has the best high-temperature oxidation resistance at different temperatures. The oxidation behaviors of the alloys follow the linear-parabolic law, and the oxidation products of the alloys are composed of rutile-TiO2, anatase-TiO2, Y2O3 and Al2O3. The room-temperature and 700 °C UTS of the alloys decreases first and then increases with the increase of Y content; the 0.1 wt.% Y composition alloy has the best room-temperature mechanical properties with a UTS of 1012 MPa and elongation of 1.0%. The 700 °C UTS and elongation of the alloy with 0.1 wt.% Y is 694 MPa and 9.8%, showing an optimal comprehensive performance. The UTS and elongation of the alloys at 750 °C increase first and then decrease with the increase of Y content. The optimal UTS and elongation of the alloy is 556 MPa and 10.1% obtained in 0.2 wt.% Y composition alloy. The cleavage and dimples fractures are the primary fracture mode for the room- and high-temperature tensile fracture, respectively.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Shen

Wang³

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…The kinetic parameters and reaction mechanism were determined by analyzing the linear correlation of the curves. [27,34] For the oxidation process of mixed materials, the reaction rate equation of the mixture is expressed as an integral function during oxidation roasting, as shown in Equation (1), where, α is the percentage of conversion (%), k(T ) is the reaction rate constant (À), g(α) is the kinetic mechanism function (À), T is the absolute temperature (K), and t is the reaction time (min).…”

Section: Oxidation Kinetics Analysis Methodsmentioning

confidence: 99%

“…The kinetic parameters and reaction mechanism were determined by analyzing the linear correlation of the curves. [ 27,34 ]…”

Section: Methodsmentioning

confidence: 99%

“…Recently, some researches focused on the kinetics of pellet oxidation were reported. [25][26][27][28][29][30][31][32] Lv et al [25] studied the isothermal oxidation kinetics of ilmenite in air atmosphere and discovered that the reaction mechanism conformed to 3D diffusion when the oxidation temperature was below 600 °C. Mozammel et al [26] investigated the isothermal kinetics of oxidation with Iranian ilmenite and presented that the restrictive link was the chemical reaction below 750 °C, while the diffusion reaction was the controlling step above 750 °C.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of TiO₂ during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Feng,

Tang,

Wang

et al. 2023

steel research int.

View full text Add to dashboard Cite

This study investigates the effect of TiO2 on the oxidation kinetic mechanism of iron ore concentrate under nonisothermal conditions. Based on the fact that iron‐containing materials are mainly smelted in the form of pellets, the microstructure evolution of pellets with different TiO2 additions during oxidation is studied to verify the accuracy of the kinetic analysis results. The results show that the reaction model is the mechanism describing oxidation of iron ore concentrate under different TiO2 additions at stages I and II. The increase of TiO2 increases E and worsens the oxidation kinetic conditions at stages I and II. This phenomenon is caused by the Fe–Ti solid solution embedded in the hematite particles hindering the recrystallization and large‐scale crystal bridge connection of hematite. The fluctuation amplitude of apparent activation energy (E) at stages I and II is 23.6112 and 19.508 kJ mol−1, respectively. Furthermore, the mechanism of stage III corresponds to the diffusion model, and the increase of TiO2 decreases E and improves the oxidation kinetic conditions. It is due to the loose structure of pellets with the increase of TiO2, facilitating the internal diffusion of reaction gases. The fluctuation amplitude of E is 5.07 kJ mol−1 at stage III.

show abstract

Study on the Formation Mechanism of Surface Color of Oxide Film for Ti-6Al-4V in Cutting Process

Li,

Zhang,

You

2024

Int. J. Precis. Eng. Manuf.

View full text Add to dashboard Cite

Oxidation kinetics and microstructure evolution of air oxidation behavior of TC18 alloy

Cited by 14 publications

References 36 publications

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Effect of TiO₂ during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Study on the Formation Mechanism of Surface Color of Oxide Film for Ti-6Al-4V in Cutting Process

Contact Info

Product

Resources

About

Oxidation kinetics and microstructure evolution of air oxidation behavior of TC18 alloy

Cited by 14 publications

References 36 publications

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Effect of TiO2 during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Study on the Formation Mechanism of Surface Color of Oxide Film for Ti-6Al-4V in Cutting Process

Contact Info

Product

Resources

About

Effect of TiO₂ during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure