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Effects of Homogenization Treatment on the Microsegregation of a Ni–Co Based Superalloy Produced by Directional Solidification

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Acta Metallurgica Sinica (English Letters) Aims and scope

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Abstract

To reduce microsegregation, a series of homogenization treatments were carried out on a Ni–Co based superalloy prepared through directional solidification (DS). The element segregation characteristics and microstructural evolution were investigated by optical microscopy (OM), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The results show that the elements are non-uniformly distributed in the solidified superalloy, in which W and Ti have the greatest tendency of microsegregation. Furthermore, severe microsegregation leads to complicated precipitations, including η-Ni3Ti and eutectic (γ + γ′). EPMA results show that Al and Mo are uniformly distributed between the eutectic (γ + γ′) and γ matrix, whereas Ti is segregated in the eutectic (γ + γ′) and η phases. The positive segregation element Ti, which is continuously rejected into the remaining liquid during γ matrix solidification, promotes the formation of eutectic (γ + γ′) and the transformation of the η phase. According to the homogenization effect, the optimal single-stage homogenization process of this alloy is 1180 °C for 2 h because of the sufficient diffusion segregation of the elements. In the present study, a kinetic diffusion model was built to reflect the degree of element segregation during homogenization, and the diffusion coefficients of W and Ti were estimated.

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taken from the interdendritic region

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (Nos. 2019YFA0705304 and 2017YFA0700703), the National Natural Science Foundation of China (No. 51671189), Innovation Program of Institute of Metal Research, China Academy of Science (No.2021-PY09), and the Doctoral Scientific Research Foundation of Liaoning Province (No. 2020-BS-007).

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Authors and Affiliations

  1. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Zijian Zhou, Rui Zhang, Chuanyong Cui, Yizhou Zhou & Xiaofeng Sun

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Zijian Zhou

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  1. Zijian Zhou
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  2. Rui Zhang
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  3. Chuanyong Cui
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  4. Yizhou Zhou
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Correspondence to Rui Zhang or Chuanyong Cui.

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Zhou, Z., Zhang, R., Cui, C. et al. Effects of Homogenization Treatment on the Microsegregation of a Ni–Co Based Superalloy Produced by Directional Solidification. Acta Metall. Sin. (Engl. Lett.) 34, 943–954 (2021). https://doi.org/10.1007/s40195-021-01192-7

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  • DOI: https://doi.org/10.1007/s40195-021-01192-7

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