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Microstructural Study of Laser Formed Ti-6Al-4V

Published online by Cambridge University Press:  10 February 2011

S.M. Kelly,
S.L. Kampe and
C.R. Crowe
S.M. Kelly
Affiliation:
Materials Science and Engineering Department, Virginia Tech, Blacksburg, VA 24061-0237
S.L. Kampe
Affiliation:
Materials Science and Engineering Department, Virginia Tech, Blacksburg, VA 24061-0237
C.R. Crowe
Affiliation:
Virginia Tech Alexandria Research Institute, Alexandria, VA 22314
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Abstract

A microstructural evaluation of as-deposited LasformedSM Ti-6Al-4V, a Laser Additive Manufacturing (LAM) process, is the subject of the current work. Distinct features of the macrostructure include: large columnar prior-β grains (the initial solid to form upon cooling from the melt) have grown through multiple deposited layers due to epitaxial growth from previously solidified layers; a well defined heat affected zone; the presence of “layer bands,” which are speculated to be a result of macrosegregation in the solidifying melt puddle and/or the complex thermal history that the part received as it was built, layer by layer. The microstructure of the layer band consists of larger colonies of acicular α outlined in transformed β, whereas the adjacent material consists of smaller colonies having the same type of structure.

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