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Bonding EBM-built blocks of 316L steel, using hot isostatic pressing

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Author list: Rännar, Lars-Erik

Publisher: European Powder Metallurgy Association (EPMA)

Publication year: 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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