High strength and ductility of electron beam melted β stabilized γ-TiAl alloy at 800°C

Narayana, P.L.; Li, Chenglin; Kim, Seong-Woong; Kim, Seung-Eon; Marquardt, Axel; Leyens, Christoph; Reddy, N.S.; Yeom, Jong‐Taek; Hong, Jae‐Keun

doi:10.1016/j.msea.2019.03.114

Cited by 36 publications

(18 citation statements)

References 28 publications

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“…Along with the use of SLM the additive manufacturing process of ELECTRON BEAM MELTING is also used in some cases. The EBM manufactured TNM-B1 alloy displayed a strength of 462 MPa and YS along with 580 MPa of UTS having ductility (58% of El) at 800 °C [12]. These values are much higher than their conventionally manufactured counterparts.…”

Section: Impact Of Grain Size On Ductility and Strengthmentioning

confidence: 90%

A comprehensive study to select suitable method to enhance mechanical properties during 3D printing of metallic materials

Chandra¹,

Porwal²

2020

E3S Web Conf.

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Metallic metals are governed by their mechanical properties. Ductility and Strength two most significant properties behave as two opposite poles while metal is manufactured by conventional methods. Additive manufacturing however acts as a bridge binding two into more of a proportional relationship. Additive manufacturing commonly referred as 3D Printing reduces the tact time along with high dimensional accuracies hence it has turned out to be the most researched technologies in the recent times. Out of several 3D Printing methods Selective laser melting and Electron beam melting prove more efficient in increasing the strength along with ductility by significantly altering the grain structure thus creating an array of properties which are different from their contemporaries. The paper deals with the effects of the two processes along with the challenges faced due to the defects risen during the processing in order to optimally decide the process to be taken up for a selected metallic metal

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Section: Impact Of Grain Size On Ductility and Strengthmentioning

confidence: 90%

A comprehensive study to select suitable method to enhance mechanical properties during 3D printing of metallic materials

Chandra¹,

Porwal²

2020

E3S Web Conf.

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“…Several authors [ 4 , 9 , 24 , 26 , 61 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 100 , 101 , 102 ] have used a dual-stage heat treatment process in trying to reduce the β-phase. These TiAl-based alloys were first heated to a temperature above the γ solvus temperature (Tγ solv ), held for a brief period to avoid grain growth with subsequent fast cooling.…”

Section: Effects Of Alloying Elements On Tial-based Alloysmentioning

confidence: 99%

“…Intermetallic γ-TiAl-based alloys fulfil various crucial prerequisites for lightweight structural applications in the automotive and aerospace industries [ 9 , 14 , 22 , 101 ]. As stated earlier, Ti–Al alloying systems are potential weight saving high-temperature materials.…”

Section: Applications and Future Outlookmentioning

confidence: 99%

“…Melting metallurgy is confronted with the issue of high reactivity of melt with melting crucibles, high melting points of intermetallic phases, exothermic reactions during intermetallic phase formation and cracks and pores formation [ 115 ]. All these difficulties associated with wrought processing motivated researchers to study additive manufacturing (AM) technology for producing TiAl-based alloy products [ 11 , 14 , 30 , 31 , 101 , 121 ].…”

Section: Applications and Future Outlookmentioning

confidence: 99%

“…Due to the high precision in AM techniques, it could be used to make several aerospace components with complex shapes from TiAl-based alloys. Among the AM technologies, LENS, EBM and SLS have been successfully used in the development of TiAl alloys [ 31 , 43 , 81 , 101 , 122 , 123 ].…”

Section: Applications and Future Outlookmentioning

confidence: 99%

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Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Raji

Popoola

Pityana

2020

Heliyon

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The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied as turbocharger wheels of automobile and turbine blades of aircraft engines. A much recent alloy type of TiAl called the TNM alloy has emerged and primarily amenable to mechanical working; while providing the best combinations of mechanical properties that could be achieved through manufacturing processes with subsequent heat treatments. This is attained by solidifying entirely through the disordered β-phase (A2 structure). Effects of major alloying elements such as strength improvement, microstructural stability and phase formation demand the understanding of these alloying elements addition in TiAl-based intermetallic alloys. This review paper aims at encapsulating several works regarding the effects of major alloying elements on β-solidifying TiAl-based alloys and summarizing the characteristic effects of Si for these types of alloys. An impetus for future works on these types of intermetallic TiAl-based alloys is also presented.

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On the Formation Mechanism of Banded Microstructures in Electron Beam Melted Ti–48Al–2Cr–2Nb and the Design of Heat Treatments as Remedial Action

et al. 2021

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The formation mechanism of banded microstructures of an electron beam melted engineering intermetallic Ti–48Al–2Cr–2Nb alloy, the solidification behavior, and the heat treatment response are investigated via a process parameter study. Scanning electron microscopy, hardness testing, X‐ray diffraction, electron probe microanalysis, thermomechanical analysis, electron backscatter diffraction, heat treatments, as well as thermodynamic equilibrium calculation, and numerical simulation were performed. All specimens show near‐γ microstructures with low amounts of α2 and traces of βo. Fabrication with an increased energy input leads to an increased Al loss due to evaporation, a lower α‐transus temperature, and to a higher hardness. Banded microstructures form due to abnormal grain growth toward the bottom of original melt pools, whereas α2 in Al‐depleted zones enables a Zener pinning of the γ‐grain boundaries, leading to fine‐grained areas. Via numerical simulation, it is shown that increasing the energy input leads to larger maximum temperatures and melt pool sizes, longer times in the liquid state, and more remelting events. Solidification happens via the α‐phase and increasing the energy input leads to an alignment of (111)γ in building direction. Furthermore, banded microstructures respond heterogeneously to heat treatments. Heat treatment is introduced based on homogenization via phase transformation to obtain isotropic microstructures.

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High strength and ductility of electron beam melted β stabilized γ-TiAl alloy at 800°C

Cited by 36 publications

References 28 publications

A comprehensive study to select suitable method to enhance mechanical properties during 3D printing of metallic materials

A comprehensive study to select suitable method to enhance mechanical properties during 3D printing of metallic materials

Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

On the Formation Mechanism of Banded Microstructures in Electron Beam Melted Ti–48Al–2Cr–2Nb and the Design of Heat Treatments as Remedial Action

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