Abstract
Microstructure evolution and wear resistance of Stellite 12 produced by laser additive manufacturing were studied in untreated and heat-treated conditions. In untreated conditions, cobalt matrix dendrites and inter-dendritic eutectic carbides were the primary microstructure, blocky and lamellar eutectic carbides can be found, and M7C3 and M23C6 are the primary carbides. Heat treatment can modify the microstructure of this alloy. Primary carbides were dissolved into the cobalt matrix after solution treatment. Aging treatment resulted in the precipitation of carbides, the transformation of M7C3 into M23C6 carbides, and the increase in microhardness. Solution and aging treatment can also cause the precipitation of carbides, but the morphology and distribution of carbides were absolutely different. The wear resistance of untreated samples at room temperature (RT) and 600 °C is better than that at 200 and 400 °C due to the high hardness at RT and the formation of oxide film at 600 °C. The wear resistance of heat-treated samples was tested at 600 °C; it was dominated by the formation and flake-off of oxide film. The sample that underwent solution plus aging treatment has a superior wear resistance.
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Acknowledgements
This work was supported by the National Nature Science Foundation of China (Grant No. 51104110) and by the Suzhou Science and Technology Bureau, China (Grant Nos. SYG201231 and SYG201642). This work was also supported by the State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, China (Grant No. SKLAB02014006).
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Ren, B., Zhang, M., Chen, C. et al. Effect of Heat Treatment on Microstructure and Mechanical Properties of Stellite 12 Fabricated by Laser Additive Manufacturing. J. of Materi Eng and Perform 26, 5404–5413 (2017). https://doi.org/10.1007/s11665-017-2984-0
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DOI: https://doi.org/10.1007/s11665-017-2984-0