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Bonding EBM-built Blocks Of 316L Steel, Using Hot Isostatic Pressing

  • : Pelle Mellin1, Hans Magnusson1, Peter Harlin2, Stefan Wikman3, Jon Olsén4
  • : 1Swerea KIMAB, 2AB Sandvik Materials Technology, 3Fusion for Energy F4E, 4Stockholm University
  • : PDF Download
  • : 2017

Abstract

To enable production of the First Wall Beam in the ITER fusion reactor; we attempt to join EBM-built blocks of 316L, by Hot Isostatic Pressing (HIP).

For highly critical components, EBM-built material is usually HIPed anyway to heal defects such as pores and cracks. Using HIP to simultaneously bond several print-jobs together into a larger component saves time and reduces manufacturing complexity.

We found by carrying out this research, that fine surface roughness is an important enabler for a complete bond. The raw printed surfaces that are obtained straight from the Arcam machine (Ra = 19.2 μm) do not enable a good bond. Instead, traditional machining, which in this paper reached Ra = 2.0 μm, enabled a good bond. HIP parameters are also important. The best bond in this study was achieved after increasing holding time from 1 h to 2 h.

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