Production of in situ TiB2+TiC/Fe composite coating from precursor containing B4C-TiO2-Al powders by laser cladding
(1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education),Shandong University, Ji’nan 250061, China;2. School of Mechanical, Electrical and Information Engineering,Shandong University at Weihai, Weihai 264209, China;3. Shandong Electric Power Research Institute, Ji’nan 250002, China)
Abstract: Steel matrix composites reinforced with TiB2+TiC reinforcement were produced by laser melting mixture of B4C, TiO2, Al and Fe-based self-melting alloy powders. The results show that TiB2+TiC ceramic particles were synthesized from the reaction of B4C, TiO2 and Al alloys during laser cladding process. The reinforcement particles were evenly distributed in the coating. TiB2 grew in rectangle shape, but TiC presented irregular cubic shape. The wear resistance of the coating was higher than that of the substrate of 1045 steel; meanwhile, the friction coefficient of the coating was considerably lower than that of 1045 steel.
Key words: TiB2-TiC; laser cladding; microstructure; wear properties