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Journal of Materials Science

, Volume 53, Issue 13, pp 9755–9770 | Cite as

Primary dendrite spacing selection during directional solidification of multicomponent nickel-based superalloy: multiphase-field study

  • Cong Yang
  • Qingyan Xu
  • Baicheng Liu
Metals

Abstract

The primary dendrite spacing selection in a multicomponent Ni-based superalloy during directional solidification was systematically studied using two-dimensional phase-field simulations. The alloy thermodynamic and kinetic data were obtained from Pandat software with PanNickel database and directly coupled into the multiphase-field model. All the simulations were performed on a GPU server, and an optimized computing scheme using GPU shared memory was adopted. First, the morphology of the solidification front was studied, and the segregation pattern was investigated and compared with the experimental results. Then, the dendritic spacing distribution under a wide range of pulling velocities Vp (10–500 μm s−1) and temperature gradients G (2–200 K mm−1) was obtained and analyzed. The simulation results agree well with analytical model that the primary dendrite spacing scales as \( \varLambda \propto V_{\text{p}}^{ - b} G^{ - c} \). The coefficient b is near a constant value of 0.38 and varies slightly between 0.34 and 0.42, while coefficient c increases monotonously from 0.27 to 0.56 with the increasing G. The predicted dendritic spacing agrees well with the experimental data, but exhibits a major difference when under very low cooling rate (R < 0.1 K s−1). The effect of grain inclination angle θ on the final primary dendritic spacing was also studied, and an abnormal decrease in dendritic spacing was found under low grain orientation where θ < 10°. When the grain inclination angle exceeds 20°, the dendritic spacing increases with θ as the power law.

Notes

Acknowledgements

This research was funded by the National Key Research and Development Program of China (2017YFB0701503), National Science and Technology Major Project (No. 2017ZX04014001) and the National Natural Science Foundation of China (No. 51374137).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and EngineeringTsinghua UniversityBeijingChina

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