Abstract: To improve the microhardness and wear resistance of the sucker rod steel, the TiN reinforced Co-based alloy coa-tings were prepared on the surface of 35CrMo steel by high-frequency induction cladding. The composite coatings were metallurgically bonded to the substrate, and the microstructures were compactness and uniformity with few defects such as pores and cracks. The microstructure of the coating layer was investigated by metalloscope, SEM and XRD, and the microhardness distribution of the coa-ting was tested by microhardness tester. The friction coefficient and wear mass loss were also investigated. The results show that the organization is mainly Co solid solution, and hard phases (Cr23C6,Cr2B and TiN) were dispersed distribution in Co-based substrate. The 10%TiN+Co cladding layer surface has the highest hardness of 788HV0.1, and hardness gradient increased from the interface to the surface. Under the same condition, the coating with 10% TiN additions has the least relative wear rate. Its wear resistance and wear quality were reduced by 40% and 45%, compared with the coating without TiN addition. The wear mechanisms of the compo-site coatings were mainly adhesive wear and abrasive wear.
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2018, Vol. 32 
