Heterogeneous Deformation Behaviors of an Inertia Friction Welded Ti2AlNb Joint: an In-situ Study

Wu, Qingfeng; Jin, Feng; Cai, Xu; Wang, Mingxin; Wang, Zhijun; Li, Junjie; He, Feng; Li, Jinglong; Wang, Jincheng

doi:10.1007/s40195-022-01477-5

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…The results demonstrated that the maximum crystal texture strength in the WNZ was not more than 1.74 times that of the strength in the complete absence of texture. These findings indicated that the preferred orientation of the crystal texture was weak and the microtexture had a negligible effect on the overall texture strength, which confirmed the promiscuous distribution of the crystals displayed in Figure 7 a [ 4 ].…”

Section: Resultssupporting

confidence: 67%

“…Therefore, it means FGH96 alloy has excellent comprehensive mechanical properties, as well as excellent corrosion resistance and high-temperature oxidation resistance. It is one of the current superalloys for turbine discs with the highest strength level under operating conditions of 700 °C, and it is the key material for high-performance engine turbine disc rings and other hot components [ 2 , 3 , 4 , 5 ]. Inertia friction welding (IFW) utilizes friction heat generated by the relative motion between the contact surfaces of materials, causing the surfaces of the components intended to be welded and the surrounding material to soften and become rapidly forged.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Powder Metallurgy Superalloy Joints Welded by Inertia Friction Welding

Zhang,

Zhao,

Tong

et al. 2024

Materials

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In recent years, for the structural characteristics and design requirements of the integral rotor and disc shaft of the integrated engine, the welding quality and mechanical properties of superalloy weldments have received increasing attention. In this paper, inertia friction welding (IFW) of FGH96 alloy was carried out using different welding parameters, and the homogeneous connection of FGH96 alloy hollow bars was successfully realized. The microstructure evolution, mechanical properties and fracture failure of the welded joints at room and high temperatures were investigated. The FGH96 alloy IFW joints were divided into the weld nugget zone (WNZ), the thermo-mechanically affected zone (TMAZ), the heat-affected zone (HAZ) and the base metal (BM), and there were significant differences in grain structure and distribution of the γ′ phase in each of the characteristic zones. The microhardness and tensile properties of the IFW joints were investigated, and the results showed an “M”-shaped curve in the microhardness distribution, with the lowest point of hardness observed in the HAZ. The tensile test results indicated that the fracture position moved from the BM to the WNZ with the increase in temperature, the microstructure at the fracture changed significantly and the tensile strength decreased from 1512.0 MPa at room temperature to 1201.3 MPa at 750 °C. The difference in the mechanical properties of the joints was mainly attributed to the changes in the dissolution and precipitation of the γ′ phase.

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Section: Resultssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Powder Metallurgy Superalloy Joints Welded by Inertia Friction Welding

Zhang,

Zhao,

Tong

et al. 2024

Materials

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show abstract

“…Therefore, constructing the L-J constitutive model of EA4T steel before creating the CA model is very helpful. Many studies have focused on various constitutive models of EA4T steel, [21,25] but an L-J constitutive model of EA4T steel is still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…The constitutive relationship, microstructure, and damage evolution model of EA4T steel during hot deformation have also been investigated. [ 21,22 ] However, a CA model suitable for EA4T steel has not yet been developed. To develop a CA model for EA4T steel, a criterion that can be used to verify the model must be established.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model and Cellular Automaton Simulation of the Dynamic Recrystallization of Railway EA4T‐Grade Steel

Ren

Huo

et al. 2023

steel research int.

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Herein, isothermal compression experiments are conducted on EA4T steel at 970–1170 °C, with strain rates of 0.01–1.0 s−1 and a strain of 0.2–0.8 s−1. Based on the experimental data, a high‐temperature constitutive model is developed for EA4T steel. The activation energy of dynamic recrystallization (DRX) is calculated to be 383 666 J mol−1, and the correlation coefficient and root mean square error between the results of the constitutive model and experimental results are 0.9943 and 4.6823, respectively. The average grain size for each deformation condition is determined using the linear‐intercept method. The grain growth model widely used in cellular automaton (CA) simulations is found unsuitable for EA4T steel. Therefore, a modified CA model of DRX behavior suitable for EA4T steel is developed. The nucleation rates and solute drag effect coefficients under different deformation conditions are determined. Furthermore, simulations are performed under other deformation conditions using the CA model. The simulated results for the average grain size, microstructure morphology, and DRX fraction agree well with the experimental results. The reason for the deviation between the observed and simulated DRX fractions is also explored.

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Structure and mechanical properties of Ti2AlNb-based alloy welded joints using keyhole plasma arc welding with subsequent heat treatment

Naumov,

Panov,

Chernichenko

et al. 2024

Izv.VUZ. Tsvet. Met.

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Using keyhole plasma arc welding, welded joints of a Ti2AlNb-based alloy, VTI-4, were obtained, and their structure and mechanical properties were studied. It has been established that the dynamic effect of a keyhole arc had a positive effect on the quality of the welded joint; namely, lack of penetration, porosity, and microcracks were eliminated. The welded joint consisted of a fusion zone (FZ), a heat-affected zone (HAZ), and a base metal (BM). Depending on the phase composition and morphology of the obtained phases, the HAZ can be divided into four zones: HAZ1 with large β-phase grains near the melting line, HAZ2 with large β-phase grains + α2, HAZ3 with more fragmented β-phase grains retaining more α2-phase, and HAZ4 with the phase composition β + α2 + O. Subsequent heat treatment (HT: quenching at 920 °C for 2 h, cooling in air, followed by aging at 800 °C for 6 h, cooling in air) preserved the zone structure of the weld but led to the formation of the O-phase within β-grains. The microhardness of the weld in the zone corresponds to 360±15 HV0.2, but after HT, it increased to 382±20 HV0.2. The strength properties of the welded joint after HT were above 90 % of the base metal (σucs = 1120 MPa, σ0.2 = 1090 MPa), while elongation to failure is close to the initial condition (δ = 2.1 %).

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Heterogeneous Deformation Behaviors of an Inertia Friction Welded Ti2AlNb Joint: an In-situ Study

Cited by 4 publications

References 35 publications

Microstructure and Mechanical Properties of Powder Metallurgy Superalloy Joints Welded by Inertia Friction Welding

Microstructure and Mechanical Properties of Powder Metallurgy Superalloy Joints Welded by Inertia Friction Welding

Constitutive Model and Cellular Automaton Simulation of the Dynamic Recrystallization of Railway EA4T‐Grade Steel

Structure and mechanical properties of Ti2AlNb-based alloy welded joints using keyhole plasma arc welding with subsequent heat treatment

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