Abstract
In the present work, the surfaces of AISI 1045 medium carbon steel samples were modified by duplex thermo-reactive diffusion treatments of pack-titanizing and pack-boriding. For this purpose, two different treatment paths of titanizing followed by boriding (Ti-B) and boriding of titanized layer (B-Ti) have been used to fabricate TiB2/TiB composite coating on the surfaces. A single compact and homogenous layer of TiC/TiB2 and saw-tooth structure of Fe2B/TiB composite coatings are formed after Ti-B and B-Ti treatments, respectively. According to the results, all coatings showed extremely lower friction coefficient and wear rate compared to the substrate and the lowest amounts belonged to the Ti-B treatment. This was attributed to the predomination of the light oxidation and partial fracture wear mechanisms in the Ti-B coating.
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