The prospects for additive manufacturing of bulk TiAl alloy

Thomas, Marc; Malot, T.; Aubry, Pascal; Colin, Christophe; Vilaro, Thomas; Bertrand, Ph.

doi:10.1080/09603409.2016.1171510

Cited by 48 publications

(23 citation statements)

References 20 publications

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“…In the view of Thomas et al [12], AM could contribute significantly to the manufacturing of the TiAl alloys parts for the high-temperature applications. Because it reduces the time to market production; lead time by reducing machining and joining steps and by avoiding timeconsuming tooling reworking, buy-to-fly ratio owing to a low material waste factor, weight saving, and adding supplementary functions such as cooling channels.…”

Section: Metal Additive Manufacturing Of Tial-based Alloysmentioning

confidence: 99%

“…EBM was the main AM method that scholars have experimented with in producing the TiAl alloys near-netshape, probability due to the EBM high preheating temperatures [24] which lowers the stress buildup leading to the successful production of crack-free TiAl 3D structures. Though there are issues of Al lost during the EBM process, the current literature has pointed out that optimized processing conditions have already been achieved for producing sound and crack-free TiAl materials by EBM processes [12,22,25,26]. The successfully using of the EBM technology to manufacture the TiAl-based alloys is due to the preheating system ( Fig.…”

Section: Electron Beam Melting Of Tial-based Alloysmentioning

confidence: 99%

“…To overcome the cracking of the LPBF samples due to the high-temperature gradient and residual stress which is inherent in the manufacturing process of the LPBF process, researchers begin to adopt a preheating strategy in an attempt to produce crack-free LPBF samples. Thomas et al [12] suggested that preheating and conventional post-heat treatment are a possible means of producing crack-free TiAl samples with uniform microstructure.…”

Section: Laser Powder Bed Fusion Of Tial-based Alloysmentioning

confidence: 99%

“…As explained by Thomas et al [12] generally the LPBF process induces higher cooling rates that make it difficult to alleviate the cracking effect, however, manufacturing of industrial components is highly possible if a preheating source could be employed and post-heat treatment to homogenized the microstructure are conducted. However, as depicted in Figure 2, the EBM pre-heating system ( Fig.…”

Section: Laser Powder Bed Fusion Of Tial-based Alloysmentioning

confidence: 99%

“…To avoid the fore mention drawbacks simple shape and moderate dimension of g-TiAl alloys were produced. To satisfy the industrial requirements of producing geometrical, technical, and functional TiAl components of complex shapes and homogenous microstructure, an alternative processing route(s) need to be exploited [12].…”

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of TiAl-based alloys

Dzogbewu

2020

Manufacturing Rev.

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The ever-increasing demand for developing lightweight, high-temperature materials that can operate at elevated temperatures is still a subject of worldwide research and TiAl-based alloys have come to the fore. The conventional methods of manufacturing have been used successfully to manufacture the TiAl-based alloy. However, due to the inherent limitations of the conventional methods to produce large TiAl components with intricate near-net shapes has limit the widespread application and efficiency of the TiAl components produced using conventional methods. Metal additive manufacturing such as Electron Beam Melting technology could manufacture the TiAl alloys with intricate shapes but lack geometrical accuracy. Laser powder bed fusion (LPBF) technology could manufacture the TiAl-based alloys with intricate shapes with geometrical accuracy. However, the inherent high rate of heating and cooling mechanisms of the LPBF process failed to produce crack-free TiAl components. Various preheating techniques have been experimented, to reduce the high thermal gradient and residual stress during the LPBF process that causes the cracking of the TiAl components. Although these techniques have not reached industrial readiness up to now, encouraging results have been achieved.

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Section: Metal Additive Manufacturing Of Tial-based Alloysmentioning

confidence: 99%

Section: Electron Beam Melting Of Tial-based Alloysmentioning

confidence: 99%

Section: Laser Powder Bed Fusion Of Tial-based Alloysmentioning

confidence: 99%

Section: Laser Powder Bed Fusion Of Tial-based Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of TiAl-based alloys

Dzogbewu

2020

Manufacturing Rev.

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Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

et al. 2017

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Intermetallic titanium aluminides based on the ordered g-TiAl phase have gained increasing interest as innovative high-temperature light-weight structural materials. They have found application in aerospace and automotive industries and are still subject of worldwide research and development activities. Their attractive properties perfectly match the engine manufacturers' demands. This review, bridges the gap from the development of the TNM alloy through structural characterization with sophisticated in and ex situ methods, engineering properties, manufacturing, and processing technologies to all aspects of application. Because one thing is clear, the material still has great potential.

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Exploring Structural Changes, Manufacturing, Joining, and Repair of Intermetallic γ‐TiAl‐Based Alloys: Recent Progress Enabled by In Situ Synchrotron X‐Ray Techniques

et al. 2021

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Intermetallic titanium aluminides based on the ordered γ-TiAl phase fulfil many of the key requirements of lightweight high-temperature applications. In addition to a high melting point, high specific Young's modulus and strength at elevated temperatures, excellent creep properties, and a satisfactory oxidation and burn resistance, especially their low density of roughly 4 g cm À3 makes them a material of choice for challenging structural applications such as found, e.g., in environmentally friendly combustion engine options. [1][2][3][4] Capable of withstanding extreme conditions, γ-TiAl-based alloys have already entered service as low-pressure turbine blades in jet engines, such as the GEnx engine by GE Aviation, [5] the Geared Turbofan (GTF) engine by Pratt and Whitney, [6] as well as the LEAP engine by CFM International, a joint company between Safran Aircraft Engines and GE. [7,8] In these applications, γ-TiAl-based turbine blades substitute some of the blades made of twice as heavy Ni-base superalloys in a temperature range up to 750 °C. The implementation of the advanced, lightweight material, which is also attended by an adaptation of the design, entails a substantial reduction in weight, fuel consumption, and CO 2 and NO x emissions. [9] Apart from the aircraft engine industry, γ-TiAl-based alloys have also found applications in the automotive industry, e.g., as engine valves in sports and racing cars or as turbocharger turbine wheels. [1,3,[10][11][12][13][14] The past few decades have witnessed great efforts to develop intermetallic γ-TiAl-based alloy systems that are suitable for service in these demanding areas while being economically competitive at the same time. To this end, various alloy compositions and processing routes have been studied intensively. [1,[15][16][17][18][19][20][21] Recent progress has been reviewed, e.g., in the works by Appel et al., Clemens et al., and Mayer et al. [1,3,9,22] Due to the complexity of the intermetallic alloy system, which encompasses a multitude of phases and phase transformations, [23] purposeful alloy design requires the use of manifold characterization methods. Diffraction and scattering techniques, in particular, offer access to the atomic structure of the material and provide insights into a variety of microstructural parameters. [24][25][26][27] High-energy X-rays, such as available at today's synchrotron radiation sources, and recent developments in hardware technology nowadays allow to conduct so-called in situ experiments. Experiments of this kind reveal-at a high temporal resolution-the relationship between selected external

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The prospects for additive manufacturing of bulk TiAl alloy

Cited by 48 publications

References 20 publications

Additive manufacturing of TiAl-based alloys

Additive manufacturing of TiAl-based alloys

Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

Exploring Structural Changes, Manufacturing, Joining, and Repair of Intermetallic γ‐TiAl‐Based Alloys: Recent Progress Enabled by In Situ Synchrotron X‐Ray Techniques

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