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Effect of Eutectic Characteristics on Hot Tearing of Cast Superalloys

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Abstract

The occurrence of hot cracks in the blades of Ni-based superalloy turbocharger wheels is thought to be closely related to eutectic characteristics. Different alloys that are susceptible to hot tearing, namely K418, K419 and K424, were studied. SEM was used to obtain the microstructure of the alloys. DSC, isothermal solidification quenching process and EPMA were conducted to determine the relationship between the eutectic characteristics and solidification process, segregation behavior and dendrite coalescence. The results show that a large volume fraction of γ/γ′ eutectic indicates a wide-temperature solidification range and severe segregation. A large γ/γ′ eutectic size is a result of element segregation and poor dendrite coalescence. Ti is thought to promote the formation of a large isolated residual liquid pool and lead to a large eutectic size, leading to the poor coalescence behavior of the dendrites. The volume fraction and size of the γ/γ′ eutectic were considered, and a eutectic influence factor (E) was defined to evaluate the effect of eutectic characteristics on hot tearing in cast superalloys. It was found that a high E corresponds to high hot-tearing susceptibility.

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Acknowledgments

This work was supported by National Natural Science Foundation of China No. 51571012.

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  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Z. Zhao & J. X. Dong

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Correspondence to Z. Zhao.

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Zhao, Z., Dong, J.X. Effect of Eutectic Characteristics on Hot Tearing of Cast Superalloys. J. of Materi Eng and Perform 28, 4707–4717 (2019). https://doi.org/10.1007/s11665-019-04230-9

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  • DOI: https://doi.org/10.1007/s11665-019-04230-9

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