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Material Properties of TiAl Alloy with High Nb Content Produced by the Additive Manufacturing Technology of Electron Beam Melting

  • : Terner, M1
  • : 1Politecnico di Torino
  • : PDF Download
  • : 2012

Abstract

From pre-alloyed powders, samples of the third generation Ti-46Al-2Cr-8Nb alloy were produced by the additive manufacturing technology of Electron Beam Melting. The major benefits of the process are near-net-shape manufacturing, freedom of design and high material efficiency. Using optimized process parameters, samples with low residual porosity (? 1 %) and low oxygen pick-up were realized. The material was subsequently hot isostatically pressed in the (?+?) phase field in order to further reduce porosity and recrystallize the massive material to a homogeneous, rather fine equiaxed microstructure. Further heat treatment was applied to tailor either a duplex microstructure with specific lamellar ratio or a fully lamellar microstructure.
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