High-strength titanium alloys and titanium composites with high specific stiffness for wire additive manufactured components with equiaxed microstructure

  • Ella Staufer (Author)
  • Nico Moser (Author)
  • Klein, M. (Author)
  • Jelena Horky (Author)
  • Martin Schmitz-Niederau (Author)
  • Klein, T. (Author)
  • Erich Neubauer (Author)
  • Lena Trunova (Author)
  • Duyao Zhang (Author)
  • Mark Easton (Author)
  • Christian Edtmaier (Speaker)

Activity: Talk or presentation / LecturePresentation at a scientific conference / workshop

Description

The aim of this study is to provide new Ti alloys suitable for the WAAM process, which should have either a high strength or a high specific Young’s modulus. One of the main challenges in the WAAM process is the sufficient suppression of columnar grain growth to avoid anisotropic mechanical properties. We therefore investigated the effects of microalloying with additives such as yttrium, zirconium, boron or similar, as well as the use of “sluggish” elements like iron and chromium, both known as beta stabilizers, on the microstructural stability. In order to increase the specific modulus of elasticity, alloys were furthermore reinforced with TiC or B4C particles. The microstructure and properties of these alloys and composites were also evaluated on built-up walls produced using DED and blown powder, respectively.
However, the production of particle-reinforced Ti alloys is challenging because the usual ceramic reinforcement phases react with the Ti. However, this reaction can be effectively suppressed by powder hot extrusion. Powder hot extrusion is also a versatile tool for producing various titanium alloys, starting from elemental powders in the solid state. The resulting alloys and composites and their microstructure were characterized by optical microscopy and SEM, X-ray diffraction, microhardness, elastic modulus measurements with ultrasound and density. An increase in the specific modulus of elasticity was observed in many particle-reinforced samples. In any case, the addition of Y, Zr or B, as well as Cr and Fe can effectively suppress columnar grain growth and significantly increase the specific Young’s modulus or strength.

Period19 Feb 202423 Feb 2024
Event titleWAMS2024
2024 Worldwide Advanced Manufacturing Symposium
Event typeConference
LocationOrlando, United StatesShow on map
Degree of RecognitionInternational

Research Field

  • Wire-Based Additive Manufacturing