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Effect Of Processing Parameters On Microstructure And Properties Of Tungsten Heavy Alloys Fabricated By SLM

  • : Aljaž Iveković1, Kim Vanmeensel1, Jean-Pierre Kruth1, Jef Vleugels1
  • : 1KU Leuven
  • : PDF Download
  • : 2018

Abstract

Selective laser melting (SLM) was used to fabricate different tungsten heavy alloy grades achieving high densities (e.g. > 17 g/cm3 for W7Ni3Fe). Depending on the used processing parameters (laser power scanning speed preheating etc.) three different bonding mechanisms were observed – liquid phase sintering partial melting and complete melting. Difference in applied energy density reflected in a variation of the final composition amount of W dendrites in the γ-binder phase and the contiguity of the W grains. To obtain the optimal microstructure and desired properties a post-process heat treatment was applied. In the as-built condition the samples exhibited a UTS of 870.5±30 MPa with a brittle fracture behaviour regardless of the used processing parameters during the build. However with a suitable post-process heat treatment the properties of the SLM parts are comparable to those produced by conventional powder metallurgy (UTS= 850±21 MPa with 10.2±1.0 % elongation).

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