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Microstexture of Ti-6Al-4V obtained by direct energy deposition (DED) process

Abstract : The microstructure of bulk samples prepared by CLAD® additive manufacturing of Ti-6Al-4V (Ti64) powder have been investigated by means of SEM and phase reconstruction. The CLAD® technique (laser blown powder processing) developed at IREPA LASER provides very high cooling rate promoting the formation of the martensitic α’ phase in the form of thin needles. Using Merengue 2 software developed at LEM3, the analysis of the martensitic phase orientation by EBSD enables the reconstruction of the primary β-phase that formed at high temperature. Mcrostructural observations performed at various locations within the samples revealed marked heterogeneities in the microstructure. After the first deposited layer characterized by fine and equiaxed β grains, the β grains located in the central region of the samples tend to grow in a direction perpendicular to the deposited layer plan with a coarse columnar structure. By opposition, the grains on the sample side were found to grow at angle of about 60° from the deposited layer plan. The main difference with others additive manufacturing techniques is that, only a weak crystallographic β texture was detected in these samples prepared by CLAD®.
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Laurent Weiss, Philippe Acquier, Lionel Germain, Eric Fleury. Microstexture of Ti-6Al-4V obtained by direct energy deposition (DED) process. Proceedings of the 13th World Conference on Titanium, Aug 2015, San Diego, CA, United States. pp.1305-1310, ⟨10.1002/9781119296126.ch221⟩. ⟨hal-01513466⟩



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