Abstract
Solidification behavior and hot-tearing susceptibility of superalloys are key factors in alloy-casting process performance and product quality. In this paper, the effect of Ni content on the solidification behavior and hot-tearing susceptibility of the novel Co-based superalloy Co–xNi–11Al–4W–5Cr–1Ta–4Ti (x = 10, 20, 30, 40, at. pct) was investigated. The results indicated that with increasing content of Ni, the degree of W and Ti segregation increased, while the degree of Ta segregation decreased. With increasing Ni content, the volume fraction and precipitation temperature of the β/γ′ eutectic gradually decrease, and the concentrations of Ti and Al in the residual liquid phase of the alloy gradually increase. Therefore, the solidification rate of the alloy in the hot-tearing sensitive zone decreases, and the hot-tearing susceptibility of the alloy gradually increases. The casting processing properties of the alloy also decrease. These results could offer an experimental reference for the Ni content design of Co–Ni–Al–W-based superalloys.
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Acknowledgments
The authors would like to thank the financial support of National Natural Science Foundation of China (Nos. 52022011, 52090041), National Major Science and Technology Projects of China (J2019-VI-0009-0123), and Science Center for Gas Turbine Project (P2021-A-IV-001-002).
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Zhou, X., Zhang, Y., Zhang, Y. et al. Effect of Ni Content on Solidification Behavior and Hot-Tearing Susceptibility of Co–Ni–Al–W-Based Superalloys. Metall Mater Trans A 53, 3465–3477 (2022). https://doi.org/10.1007/s11661-022-06762-7
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DOI: https://doi.org/10.1007/s11661-022-06762-7