Continuous Casting of TiAlNb Alloys with Different Velocities by Mixing Binary TiAl Ingot and Nb Wire

Fang, Hongyuan; Chen, Ruirun; Chai, Dong Liang; Yang, Yaohua; Su, Yanqing; Ding, Hongsheng; Guo, Jingjie; Fu, Hengzhi

doi:10.1002/adem.201700058

Cited by 1 publication

(1 citation statement)

References 27 publications

(27 reference statements)

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“…According to previous studies, [ 34,35 ] the physical model of the molten pool temperature is established by energy conservation at a certain solidification rate. The mathematical expressions shown in Equation ()–() show that induction heat due to the skin effect is equivalent to the total radiant energy of the molten pool, transmitted energy along the axial heat flow and the effective energy by feed

P_{normala} \cdot d_{normalt} = P_{normalr} \cdot d_{normalt} + (q_{normalL}^{'} + q_{e L}) \cdot S \cdot d_{normalt} + ρ \cdot u \cdot d_{normalt} \cdot S \cdot c_{normalp} \cdot (T_{normalm}^{'} - T_{normalL})

q_{normalL}^{'} = λ_{normalL} \frac{T_{normalm}^{'} - T_{normalL}}{Δ X}

q_{eL} = λ_{normalL} \frac{T_{normalm}^{'} - T_{normalL}}{Δ X_{normale}}

where t is pumping time,

P_{normalr}

is radiation power of the molten pool,

q_{normalL}^{'}

is the heat flux density of the fluid in the fuzzy region at a certain solidification rate,

q_{eL}

is equivalent heat flux density by feed, S is transverse section of molten pool, ρ is the alloyed density, μ is solidification rate,

c_{normalp}

is the specific heat capacity,

T_{normalm}^{'}

is the temperature when the molten pool fluid reaches a stable state under a certain pumping speed,

Δ X_{normale}

is equivalent distance of thermal conduction between molten pool and molten drop, and

T_{normalL} ...

…”

Section: Discussionmentioning

confidence: 99%

Effects of Heating Power on Microstructure Evolution and Tensile Properties at Elevated Temperature by Directional Solidification for Ti2AlC/TiAl Composites

et al. 2021

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To improve the directionally solidified microstructure and tensile properties at elevated temperature, Ti46Al4Nb1C0.8Ta ingots are directional solidified by electromagnetic cold crucible with different heating powers. The microstructure is observed and characterized, tensile properties are tested, and related mechanisms are revealed. Results show that a relatively planar liquid–solid interface is formed under the low heating power (39 kW), which promoted formation of columnar crystals. When the heating power increases from 39 to 48 kW, degree of dent (H1) increases from 8.5 to 18.1 mm and influence length of the initial transition area (H2) increases from 4.3 to 28.6 mm. The formation of a concave liquid–solid interface is due to the high heating power increasing the temperature gradient. High heating power increases the electromagnetic stirring ability, which increases the time to reach stable growth. Tensile properties of the directionally solidified alloy are higher than those of the as‐cast alloy under the same testing temperature, e.g., the tensile strength is 342.5 MPa, an increase of 1.4 times, and the tensile strain is 4.4%, an increase of 1.3 times at 950 °C. This shows that the tensile properties and microstructure of TiAl‐based composites can be improved by the directional solidification technology.

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P_{normala} \cdot d_{normalt} = P_{normalr} \cdot d_{normalt} + (q_{normalL}^{'} + q_{e L}) \cdot S \cdot d_{normalt} + ρ \cdot u \cdot d_{normalt} \cdot S \cdot c_{normalp} \cdot (T_{normalm}^{'} - T_{normalL})

q_{normalL}^{'} = λ_{normalL} \frac{T_{normalm}^{'} - T_{normalL}}{Δ X}

q_{eL} = λ_{normalL} \frac{T_{normalm}^{'} - T_{normalL}}{Δ X_{normale}}

where t is pumping time,

P_{normalr}

is radiation power of the molten pool,

q_{normalL}^{'}

is the heat flux density of the fluid in the fuzzy region at a certain solidification rate,

q_{eL}

is equivalent heat flux density by feed, S is transverse section of molten pool, ρ is the alloyed density, μ is solidification rate,

c_{normalp}

is the specific heat capacity,

T_{normalm}^{'}

is the temperature when the molten pool fluid reaches a stable state under a certain pumping speed,

Δ X_{normale}

is equivalent distance of thermal conduction between molten pool and molten drop, and

T_{normalL} ...

…”

Section: Discussionmentioning

confidence: 99%

Effects of Heating Power on Microstructure Evolution and Tensile Properties at Elevated Temperature by Directional Solidification for Ti2AlC/TiAl Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

Continuous Casting of TiAlNb Alloys with Different Velocities by Mixing Binary TiAl Ingot and Nb Wire

Cited by 1 publication

References 27 publications

Effects of Heating Power on Microstructure Evolution and Tensile Properties at Elevated Temperature by Directional Solidification for Ti2AlC/TiAl Composites

Effects of Heating Power on Microstructure Evolution and Tensile Properties at Elevated Temperature by Directional Solidification for Ti2AlC/TiAl Composites

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