The aim of this study is to investigate the effect of multimodal powders and annealing on cold sprayed deposits. In the experiments, a multimodal WC-Co powder containing micro- and nano-sized particles was prepared by ball milling and deposited on stainless steel substrates. The hardness of the resulting layer was comparable to that of the nanostructured WC-Co bulk and its fracture toughness reached a level close to that of the microstructured bulk. It is thus shown that with multimodal particle distribution cold-sprayed WC-Co can be simultaneously strengthened and toughened. Investigators also show that interface cohesion between WC and cobalt phases can be improved by annealing, which leads to further toughening as well.

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