Influence of interlayer time on the microstructural state of CoCrMo coatings applied by selective laser melting on an iron-based substrate for different numbers of layers

The Selective Laser Melting process was used to perform cobalt-based alloy coatings on a C35 steel substrate. relationships between interlayer times, iron dilution, crystalline structures, and micro-hardness were studied for different numbers of layers with an initial lased powder layer 50 µm thickness. Reducing the time increased temperature reached in melting bed promoted matter transport from coating thickness consisted Co-Cr-Fe mixture, divided into two zones: transition zone near interface stabilized towards real found be always greater when reduced. For equal 11 s (series 2), dilution higher than ranging 42 16 1), leading microstructural state also dependent interval successive layers. microstructure cellular because high cooling rate. XRD analysis surface showed that this is essentially composed non-equilibrium phases: FCC ?’ BCC. hardness due content which induces martensite phase 2). Starting 5 series 1 6 2, BCC disappeared if reduced by more 45% weight. mean decreased increasing number decrease content. Finally, phase, its part, solution Co matrix.