Herein, attempts were made to develop W/steel joints via selective laser melting (SLM) for the first time. The influence of processing parameters on the joint strength was investigated. To further improve the mechanical properties, we performed post-heat treatment on the as-fabricated specimens. The results showed that large amounts of solid solution and dispersed micro-/nanoparticles appear in the interface of W/steel joints fabricated by direct SLM because of the uniqueness of non-equilibrium solidification, which is favourable for the bonding properties. However, the solid solution gradually transforms into the Fe2W(Ni, Cr) phase encapsulated with W particles during heat treatment, while the Fe7W6 phase fills the poles at the W/steel interface, which is extremely detrimental to the bonding properties.
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