Abstract
Wear-resistant cobalt-based alloys generally contain high chromium content so that the carbides in these alloys are mainly Cr-rich except the alloys which contain very high tungsten content. In this research an abnormal cobalt-based with very low chromium but very high tungsten content is created, in order to avoid Cr-rich carbide precipitation. The focus of the research is to investigate the effect of chromium and tungsten contents on the formation of carbides in cobalt-based alloys. Furthermore, the influence of heat treatment on the microstructure change of the new alloy is studied by aging the alloy at a temperature of 900 °C for 24 hours or at 980 °C for 350 hours. It is found that the heat treatments can cause dissolution of W-rich carbides and promote graphite separation from the carbides in the new alloy. The dry-sliding wear tests show that the presence of graphite improves the tribological properties of the new alloy due to reduction in friction. Aging time has influence on the dissolution of the carbides in the new alloy, thus affecting the amount of graphite precipitation during the heat treatment. Stellite 80, having the same carbon content but different chromium and tungsten contents with the new alloy, is studied in parallel for comparison.
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Acknowledgments
The authors are grateful for financial support from the Key R&D Program of Zhejiang Province, China (Grant No. 2019C04004), the Natural Science & Engineering Research Council of Canada (NSERC), financial and in-kind support of Kennametal Stellite Inc., as well as the financial support from the China Scholarship Council and the Cultivation Fund of Zhejiang University of Technology for Excellent Doctoral Dissertation. Mr. Jiajin Sheng and Chenggan Xue also contributed to the experiments of this research.
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Ding, Y., Liu, R., Zhang, X. et al. Study of Carbide Precipitation in Two Cobalt-Based Alloys with Distinct Chromium and Tungsten Contents. J. of Materi Eng and Perform 30, 5962–5973 (2021). https://doi.org/10.1007/s11665-021-05786-1
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DOI: https://doi.org/10.1007/s11665-021-05786-1