Fabrication of TiAl components by means of hot forging and machining

Tetsui, Toshimitsu; Shindo, Kentaro; Kaji, Satoshi; Kobayashi, Satoru; Takeyama, Masao

doi:10.1016/j.intermet.2004.12.012

Cited by 184 publications

(84 citation statements)

References 6 publications

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“…However, certain reinforcement phases are subject to phase transformation at elevated temperatures and, thus, AMMCs exhibit unstable structure. As to in situ composite materials, reinforcement phases are formed during solidification, sintering, or synthesizing [7,[20][21][22]. Thus, in situ reinforcement phases make processes shorter and reduce the costs.…”

Section: Introductionmentioning

confidence: 99%

Wear Behaviour of A356/TiAl3 in Situ Composites Produced by Mechanical Alloying

Çam

Demir

Özyürek

2016

Metals

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Abstract:In this study, the effects of in situ TiAl 3 particles on dry sliding wear behavior of A356 aluminum alloy (added Ti) composites were investigated. The wear samples were prepared by adding different amounts of Ti (4%, 6%, and 8%) into A356 powder alloy by mechanical alloying. The mechanically alloyed powders were cold pressed at 600 MPa and sintered 530˝C for 1 h in argon atmosphere and cooled in the furnace. After the sintering process, the samples were characterized. The results show that AlTi and TiAl 3 intermetallic phases were formed and their amount increased depending on the amount of Ti added into A356 powder alloy. Out of the samples sintered with different titanium amounts (1 h at 530˝C), the highest hardness value and, accordingly, the lowest wear amount, were observed in the alloy containing 8% Ti.

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Section: Introductionmentioning

confidence: 99%

Wear Behaviour of A356/TiAl3 in Situ Composites Produced by Mechanical Alloying

Çam

Demir

Özyürek

2016

Metals

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“…The investigation suggested that the flow softening was also a result of adiabatic heating. Tetsui et al [11] investigated hot forging and subsequent machining of a Ti-42Al-5Mn alloy with the aim of supplying large TiAl components with complex shapes and high dimensional precision, expanding the application variety of TiAl alloys. The authors verified that complex configurations were possible to fabricate using hot forging and machining.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The equations and parameters used for the cost analysis model are given, as well as the produced results. For a lot size L, the unit costs C are C = C die + C setup L + C process + C billet (11) The costs for the dies (number n die ) are…”

Section: Cost Analysismentioning

confidence: 99%

Batch Processing in Preassembled Die Sets—A New Process Design for Isothermal Forging of Titanium Aluminides

Bambach

Sizova

Sviridov

et al. 2018

JMMP

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Titanium aluminide (TiAl) turbine blades produced by isothermal forging have recently been implemented in the low-pressure part of commercial aircraft jet engines. However, the slow speed of isothermal forging, costly molybdenum-based dies and the required protective forging atmosphere makes the process rather expensive. Currently, industrial forging is done by closed-die isothermal forging processes with stationary dies. Idle time occurs when single parts are inserted and extracted from the dies. As an interesting alternative for forging small parts, a new set-up is devised and explored in this work, i.e., batch processing. Using a die set which allow for off-line preassembly and preheating, multiple parts can be forged in one stroke. The design of the batch process was based on a new material model, which was implemented into a finite element system to identify the forging parameters. The setup of the press transport system for batch processing, as well as the results of the simulations and forging experiments are presented. A cost comparison between the new process and conventional forging with stationary dies concludes that for smaller parts such as compressor blades, batch processing offers advantages regarding productivity and cost.

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“…The application of TiAl alloy is limited. TiAl alloys containing the β phase show much better hot workability than (γ + α 2 ) TiAl alloys, even enabling the production of TiAl components using near conventional hot-working processes and equipment [2,4]. This increases the economic feasibility of hot processing for the manufacture of TiAl components.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases

Liu

Rong

Gao

et al. 2016

Metals

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Abstract:The hot deformation behavior and microstructural evolution of Ti-44Al-5V-1Cr alloy were investigated by hot compression tests at temperatures of 1000-1250 • C and strain rates of 0.001-1 s −1 . It was indicated that the dependence of peak stress on deformation temperature and strain rate could be accurately described by a hyperbolic sine type equation. The activation energy, Q, was estimated to be 632 kJ/mol. The hot processing map was developed at different strains on the basis of dynamic materials modeling and the Murty criteria. As a result, the instability zones occurred in the regions of low temperature (<1050 • C) and a high strain rate (>0.1 s −1 ). The flow soft mechanism of the instability regions is stress relaxation caused by localization deformation at lamellar boundaries. Dynamic recrystallization is the mainly refining and spheroidizing mechanism of lamellar microstructures. The optimum hot working condition of as-cast TiAl alloy occurs in the temperature range of 1175-1225 • C and the strain rate range 0.05-0.1 s −1 . The large-size TiAl alloy rectangular bars with crack-free appearance were successfully prepared by hot extrusion. After annealing, the fine and uniform microstructure with excellent deformation ability was obtained.

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Fabrication of TiAl components by means of hot forging and machining

Cited by 184 publications

References 6 publications

Wear Behaviour of A356/TiAl3 in Situ Composites Produced by Mechanical Alloying

Wear Behaviour of A356/TiAl3 in Situ Composites Produced by Mechanical Alloying

Batch Processing in Preassembled Die Sets—A New Process Design for Isothermal Forging of Titanium Aluminides

Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases

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