Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy

Date published

2011-11-30T00:00:00Z

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Springer Science Business Media

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Article

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0268-3768

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F. Wang, S. Williams, M. Rush. Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy. International Journal of Advanced Manufacturing Technology Volume 57, Numbers 5-8, pp597-603.

Abstract

The effects of pulsed gas tungsten arc weldingparameters on the morphology of additive layer manufacturedTi6Al4V has been investigated in this study. Thepeak/ base current ratio and pulse frequency are found tohave no significant effect on the refinement of prior betagrain size. However, it is found that the wire feed ratehas a considerable effect on the prior beta grainrefinement at a given heat input. This is due to the extrawire input being able to supply many heterogeneousnucleation sites and also results in a negative temperaturegradient in the front of the liquidus which blocks thecolumnar growth and changes the columnar growth toequiaixal growth.

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Keywords

Metal additive layer manufacturing, pulse gas tungsten arc welding, Ti6Al4V, microstructure refinement

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