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Mechanical properties of Ti-6Al-4V additively manufactured by electron beam melting

  • : Alexander Kirchner1, Burghardt Kloeden1, Thomas Weissgaerber1, Bernd Kieback1, Achim Schoberth2, Sarah Bagehorn2
  • : 1Fraunhofer Institute for Manufacturing Technology and Advanced Materials, 2Airbus Group Innovations
  • : PDF Download
  • : 2015

Abstract

The application of additively manufactured titanium components in the aerospace sector is attractive due to a number of potential benefits. The high freedom of design enables the fabrication of structurally optimized, lightweight parts. Complex geometries may serve additional functions. The widespread use of additive manufacturing could revolutionize logistics by dramatically reducing lead time and allowing for customized production. Manufacturing near net shape parts reduces scrap of expensive material. Together with the economy of scale this is bound to reduce part costs.

Especially for the application in safety relevant parts certainty about static and fatigue strength is critical. A challenge arises from complex influences of built parameters, heat treatments and surface quality. Ti-6Al-4V specimen built by electron beam melting (EBM) were tested as-fabricated and subjected to heat treatments adapted to various employment scenarios. The results of tensile and fatigue testing as well as crack propagation and fractography will be compared to conventionally manufactured titanium. The mechanical behavior will be correlated to the microstructural evolution caused by the heat treatments.

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