Abstract
The effects of aging temperature and holding time on the microstructure and wear resistance of induction-clad nickel-based/TiC alloy coatings were investigated. The nickel-based/TiC alloy powder was induction-clad on to 35CrMo steel substrate. Optical microscope and scanning electron microscope equipped with energy-dispersive spectroscopy were used to study the microstructure of the coatings, while x-ray diffractometry was utilized to investigate the existing phases on the coatings. Micro-hardness and wear behavior were measured by digital micro-hardness tester and dry sliding wear tester, respectively. The results showed that the coatings are mainly composed of Ni4B3, (Fe,Ni)23C6, Fe-Cr-Ni, NiFe, Ni2B and CrO0.87 phases. As the rise of aging temperature and extension of holding time, the unstable compounds gradually turn into the stable compounds. Compared with the composite coating without heat treatment, the micro-hardness and wear resistance of the composite coating after heat treatment have been greatly improved. The composite coating with the process parameter of 530 °C for 8 h has the highest micro-hardness and the best wear resistance. The performance of the composite coating with the process parameter of 580 °C for 2 h is second only to that of the coating at 530 °C for 8 h. The wear mechanism of the composite coatings was discussed.
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