摘要:
采用5 kW CO2激光器在低碳钢表面熔覆Co基合金涂层及TiN/Co基合金复合涂层，研究了两种涂层的组织、显微硬度以及滑动磨损性能。结果表明，Co基合金涂层主要组成相为γ-Co,ε-Co,Cr23C6等,TiN/Co基合金复合涂层组成相为γ-Co,ε-Co,Cr23C6,TiN和TiC等。Co基合金涂层由发达的γ-Co枝晶和其间共晶组织所组成，TiN/Co基合金涂层典型组织为等轴固溶体以及细小的共晶组织。TiN对熔覆层的组织有显著的改善作用，促使其组织细化，树枝晶向等轴晶转化，同时可显著提高Co基合金涂层的显微硬度及耐磨性能。
Abstract:
Co-based alloy and TiN/Co-based alloy composite coatings were obtained on low carbon steel surface by 5 kW CO2 laser. Microstructure, phases, micro-hardness, and sliding wear resistance of the coatings were studied. The results show that the Co-based alloy coating consists of γ-Co, ε-Co, Cr23C6, and the TiN/Co-based alloy composite coating consists of γ-Co, ε-Co, Cr23C6, TiN, TiC. The Co-based alloy coating is made up of flourishing γ-Co dendrite and eutectic structures. Equiaxed solid solution and fine eutectic structure are observed in the TiN/Co-based alloy composite coating. The influence of TiN particles on microstructure of the Co-based alloy coating is prominent that TiN refines the microstructure by changing it from dendrited to equiaxed grain.
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