Einfluß von Spannungsfrei‐Glühung und Abkühlungsgeschwindigkeit auf Mikrostruktur und Festigkeit von TiAl6V4

Welsch, G.; Bunk, W.; Kellerer, H.

doi:10.1002/mawe.19770080503

Cited by 6 publications

(1 citation statement)

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“…Another benefit of forced interpass cooling is that for Ti6Al4V α+β structures, high cooling rate and rapid solidification rate are also expected to increase the β phase, helping to make the phase distribution more easily approach the equilibrium (around 5% β phase and 95% α phase) (Welsch et al, 1977). Therefore the material strength, in a manner, is enhanced.…”

Section: Discussionmentioning

confidence: 99%

The effects of forced interpass cooling on the material properties of wire arc additively manufactured Ti6Al4V alloy

Ding

Cuiuri

et al. 2018

Journal of Materials Processing Technology

177

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To achieve improved microstructure and mechanical properties, an innovative wire arc additive manufacturing (WAAM) process with forced interpass cooling using compressed CO 2 was employed in this study to fabricate Ti6Al4V thin-walled structures. The effects of various interpass temperatures and rapid forced cooling on deposition geometry, surface oxidation, microstructural evolution, and mechanical properties of the fabricated part were investigated by laser profilometry, optical microscopy (OM), scanning electron microscopy (SEM), hardness testing and mechanical tensile testing. Results show that the microstructural evolution and mechanical properties of the deposited metal are not greatly affected by an increasing interpass temperature, however, the deposited wall tends to be widened, flattened and exhibit increased surface oxidation through visible coloration. When rapid forced cooling using CO 2 is used between deposited layers, slightly higher hardness values and increased strength can be obtained. This is mainly attributed to the combined effects of less surface oxide and high density dislocation caused by the generation of large amounts of fine-grained acicular α within the microstructure. Furthermore, forced interpass cooling not only improves deposition properties, but also promotes geometrical repeatability and also improved manufacturing efficiency through the reduction of dwell time between deposited layers. ABSTRACTTo achieve improved microstructure and mechanical properties, an innovative wire arc additive manufacturing (WAAM) process with forced interpass cooling using compressed CO 2 was employed in this study to fabricate Ti6Al4V thin-walled structures. The effects of various interpass temperatures and rapid forced cooling on deposition geometry, surface oxidation, microstructural evolution, and mechanical properties of the fabricated part were investigated by laser profilometry, optical microscopy (OM), scanning electron microscopy (SEM), hardness testing and mechanical tensile testing. Results show that the microstructural evolution and mechanical properties of the deposited metal are not greatly affected by an increasing interpass temperature, however, the deposited wall tends to be widened, flattened and exhibit increased surface oxidation through visible coloration. When rapid forced cooling using CO 2 is used between deposited layers, slightly higher hardness values and increased strength can be obtained. This is mainly attributed to the combined effects of less surface oxide and high density dislocation caused by the generation of large amounts of fine-grained acicular α within the microstructure. Furthermore, 2 forced interpass cooling not only improves deposition properties, but also promotes geometrical repeatability and also improved manufacturing efficiency through the reduction of dwell time between deposited layers.

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Section: Discussionmentioning

confidence: 99%