Effect of building direction on the microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy additively manufactured by electron beam melting

Todai, Mitsuharu; Nakano, Takayoshi; Liu, Tianqi; Yasuda, Hiroyuki; Hagihara, Koji; Cho, Ken; Ueda, Mikito; Takeyama, Masao

doi:10.1016/j.addma.2016.11.001

Cited by 142 publications

(103 citation statements)

References 34 publications

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“…To discuss the cause of such cell growth, the top layer of the built product was observed to examine the shape of the melt pool without the influence of remelting and repetitive heating, 3) which are distinctive features of layer-by-layer fabrication. 19) Figure 7 shows the OM photographs of the y-z plane in which cross-sections of the melt pool are observed. The melt pool edges are clearly seen.…”

Section: Resultsmentioning

confidence: 99%

Crystallographic Orientation Control of 316L Austenitic Stainless Steel via Selective Laser Melting

Ishimoto

Ito

et al. 2020

ISIJ Int.

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Section: Resultsmentioning

confidence: 99%

Crystallographic Orientation Control of 316L Austenitic Stainless Steel via Selective Laser Melting

Ishimoto

Ito

et al. 2020

ISIJ Int.

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“…The absence of γ grains at this heat-treatment temperature allows the unhindered growth of the lamellar microstructure [1]. The grain boundaries are jagged and give good creep behaviour [1,[14][15][16][20][21][22]. It is possible to see that increasing aluminium content and heat-treatment temperature led to twinning [24].…”

Section: Microstructure After Heat Treatmentmentioning

confidence: 97%

Heat Treatment of In Situ Laser-Fabricated Titanium Aluminide

Hoosain

Pityana

Freemantle³

et al. 2018

Metals

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Direct energy deposition (DED) via laser processing, operated under standard conditions with a localised shielding gas, is a potential method for the manufacture of the γ-TiAl alloy. The freedom of operation, which includes the production of components via in situ melting of elemental powders, makes this method economically attractive. The goal of this study was to optimise the mass flow rates that lead to gamma phase formation during laser in situ melting of Ti and Al. A 3 kW Nd:YAG laser was used to melt Ti and Al elemental powders. Single clads were produced on Ti6Al4V substrates under localised argon shielding. The samples were heat-treated to promote microstructural homogenization and to provide thermal stress relief, after which they were characterized. Lamellar and duplex microstructures were obtained; depending on the Al feed rate and heat treatment temperatures. The Vickers microhardness was found to be predominantly dependent on Al content and the amount of twinning present. X-ray diffraction detected a proportional increase in the intensity of the γ phase peak with an increase in Al content, while α2 peaks were dissolved and the twin γ-Ti3Al5 peaks diminished slightly. An alloy produced in this work achieved the target microstructure and properties associated with superior ductility and tensile strength in these materials, indicating that the technology has future potential in the production of Ti-Al materials for applications such as structural components or thermal barrier coatings.

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“…The heat affected zone below the molten pool in the AM of metals forms unique microstructures through cyclic heat treatments. Figure 20 shows the microstructure of a vertical cross-section of Ti-48Al-2Cr-2Nb (at%) alloy fabricated by EBM [38]. The microstructure is composed of two layers with different features.…”

Section: Additive Manufacturing (Am)mentioning

confidence: 99%