Study of Selective Laser Melting of intermetallic TiAl powder using integral analysis

Doubenskaia, M.; Domashenkov, Alexey; Smurov, I.; Petrovskiy, P.

doi:10.1016/j.ijmachtools.2018.02.003

Cited by 76 publications

(26 citation statements)

References 49 publications

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“…10 c and d), since higher P appears to have a more significant effect on increasing the melt temperature and temperature gradient than the laser scan speed [39]. The melt pool size and fusion boundary width are smaller in lower energy input, which results in a higher cooling rate [40].…”

Section: Microstructural Observationmentioning

confidence: 94%

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Tan

Essa

et al. 2019

International Journal of Machine Tools and Manufacture

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Section: Microstructural Observationmentioning

confidence: 94%

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Tan

Essa

et al. 2019

International Journal of Machine Tools and Manufacture

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“…Shi X. et al [13] showed that it is not possible to produce crack-free Ti-47Al-2Cr-2Nb alloy samples by the laser powder bed fusion (L-PBF) using 200 • C preheating. The L-PBF of Ti-48Al-2Cr-2Nb alloy with 450 • C preheating resulted in severe cracking formation, indicating that higher preheating temperatures must be utilized [14]. Selective electron beam melting (SEBM) has been proved feasible in fabrication of TiAl alloys [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of Ti-48Al-2Cr-2Nb Alloy Using Gas Atomized and Mechanically Alloyed Plasma Spheroidized Powders

et al. 2020

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In this paper, laser powder-bed fusion (L-PBF) additive manufacturing (AM) with a high-temperature inductive platform preheating was used to fabricate intermetallic TiAl-alloy samples. The gas atomized (GA) and mechanically alloyed plasma spheroidized (MAPS) powders of the Ti-48Al-2Cr-2Nb (at. %) alloy were used as the feedstock material. The effects of L-PBF process parameters—platform preheating temperature—on the relative density, microstructure, phase composition, and mechanical properties of printed material were evaluated. Crack-free intermetallic samples with a high relative density of 99.9% were fabricated using 900 °C preheating temperature. Scanning electron microscopy and X-Ray diffraction analyses revealed a very fine microstructure consisting of lamellar α2/γ colonies, equiaxed γ grains, and retained β phase. Compressive tests showed superior properties of AM material as compared to the conventional TiAl-alloy. However, increased oxygen content was detected in MAPS powder compared to GA powder (~1.1 wt. % and ~0.1 wt. %, respectively), which resulted in lower compressive strength and strain, but higher microhardness compared to the samples produced from GA powder.

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“…In the current literature, Löber et al have witnessed the presence of cracking already during single track deposition of a γ-TiAl alloy [24]. Similarly, Doubenskaia et al with a preheating up to 450°C witnessed cracks during the realisation of cubic specimen of Ti-48Al-2Cr-2Nb [25].…”

Section: Introductionmentioning

confidence: 94%

Defect-free laser powder bed fusion of Ti–48Al–2Cr–2Nb with a high temperature inductive preheating system

et al. 2020

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In the industrial panorama, laser powder bed fusion (LPBF) systems enable the near net shaping of metal powders into complex geometries with unique design features. This makes the technology appealing for many industrial applications, which require high performance materials combined with lightweight design, lattice structures and organic forms. However, many of the alloys that would be ideal for the realisation of these functional components are classified as difficult to weld due to their cracking sensitivity. γ-TiAl alloys are currently processed via electron beam melting (EBM) to produce components for energy generation applications. The EBM process provides crack-free processing thanks to the preheating stages between layers, but lacks geometrical precision. The use of LPBF could provide the means for higher precision, and therefore an easier post-processing stage. However, industrial LPBF systems employ resistive heating elements underneath the base plate which do not commonly reach the high temperatures required for the processing of γ-TiAl alloys. Thus, elevated temperature preheating of the build part and control over the cooling rate after the deposition process is concluded are amongst the features which require further investigations. In this work, the design and implementation of a novel inductive high temperature LPBF system to process Ti-48Al-2Cr-2Nb is presented. Specimens were built with preheating at 800°C and the cooling rate at the end of the build was controlled at 5°C min −1 . Crack formation was suppressed and apparent density in excess of 99% was achieved.

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Study of Selective Laser Melting of intermetallic TiAl powder using integral analysis

Cited by 76 publications

References 49 publications

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Additive Manufacturing of Ti-48Al-2Cr-2Nb Alloy Using Gas Atomized and Mechanically Alloyed Plasma Spheroidized Powders

Defect-free laser powder bed fusion of Ti–48Al–2Cr–2Nb with a high temperature inductive preheating system

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