Selective electron beam melting of TiAl alloy: Microstructure evolution, phase transformation and microhardness

Chen, Yuyong; Yue, Hangyu; Wang, Xiaopeng; Xiao, Shulong; Kong, Fantao; Cheng, Xiangkui; Peng, Hui

doi:10.1016/j.matchar.2018.06.027

Cited by 46 publications

(8 citation statements)

References 23 publications

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“…[ 3,9,19,21 ] Mechanical properties of TiAl parts remain highly microstructure‐sensitive, [ 8 ] which makes clarifying the processing‐microstructure–property relationship a necessity. Several different additively manufactured TiAl alloys were already investigated, such as the aforementioned Ti–(47–48)Al–2Cr–2Nb alloy, [ 3,21–42 ] or the TNM alloy, [ 43–45 ] as well as high Nb bearing TiAl alloys. [ 46–52 ] Many different microstructures of these various electron beams melted titanium aluminide alloys were reported, generally fine‐grained.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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 development of new forming and manufacturing techniques, such as Spark Plasma Sintering (SPS) [1] or additive manufacturing (SLM, EBM) [2,3], has made it possible to use several materials (intermetallics and ceramics) that haven't been used for process reasons. Among the various classes of advanced materials, there has been a renewed interest in TiAl-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study on hydrogen solubility and diffusivity in the γ-TiAl L10 structure

Connétable

2019

International Journal of Hydrogen Energy

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“…Selective electron beam melting (SEBM) was adopted by Chen et al [67], to investigate the microstructural variations of TiAl alloy samples and their impact on microhardness. A near lamellar structure was observed TiAl alloys.…”

Section: Laser Additive Manufacturing (Lam) Of Titanium Aluminidesmentioning

confidence: 99%

Laser Based Additive Manufacturing Technology for Fabrication of Titanium Aluminide-Based Composites in Aerospace Component Applications

Raji¹,

Popoola²,

Pityana³

et al. 2021

Aerodynamics

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Titanium aluminides has the potential of replacing nickel-based superalloys in the aerospace industries because its density is almost half that of nickel-based alloys. Nevertheless, the room temperature properties (ductility) have made the wider application of this class of intermetallic alloy far from being realized. This has led to various research been carried out in adjusting the production processing and/or material through alloying, heat treatment, ingot metallurgy, powder metallurgy and most recently additive manufacturing processing. One of the additive manufacturing processing of titanium aluminide is laser engineered net shaping (LENS). It is used to produce components from powders by melting and forming on a substrate based on a computer-aided design (CAD) to shape the components. This contribution will focus on the laser processing of titanium aluminides components for aerospace applications. Also, the challenges confronting this processing techniques as well as suggested finding to solve the problems would be outlined. The objective of this work is to present an insight into how titanium aluminides components have been developed by researchers with emphasis on aerospace applications.

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Selective electron beam melting of TiAl alloy: Microstructure evolution, phase transformation and microhardness

Cited by 46 publications

References 23 publications

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

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

Theoretical study on hydrogen solubility and diffusivity in the γ-TiAl L10 structure

Laser Based Additive Manufacturing Technology for Fabrication of Titanium Aluminide-Based Composites in Aerospace Component Applications

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