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Influence of directional solidification variables on the microstructure and crystal orientation of AM3 under high thermal gradient

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Abstract

Solid–liquid interface morphologies of a nickel-base single crystal superalloy AM3 were investigated under high thermal gradient. The critical velocities of planar–cellular and cellular–dendritic transition were greatly increased by high thermal gradients. A high thermal gradient was of great benefit to dendrite refinement. Experimental results showed that the primary and secondary dendrite arm spacings decreased with increasing cooling rate. As expected, the segregation of elements was suppressed and the size of the gamma prime (γ′) phase decreased significantly with increasing withdrawal rates. The shape of γ′ in interdendritic region kept cuboidal at higher withdrawal rate. It was found that the withdrawal rates had little influence on the crystallographic orientation in high thermal gradient directional solidification.

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Acknowledgements

The authors would like to thank the National Natural Science Foundation of China (Grant No. 50771081) and the National Basic Research Program of China (2006CB605202) for financial support.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Xinbao Zhao, Lin Liu, Zhuhuan Yu, Weiguo Zhang, Jun Zhang & Hengzhi Fu

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  1. Xinbao Zhao
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  2. Lin Liu
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  3. Zhuhuan Yu
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  4. Weiguo Zhang
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  5. Jun Zhang
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  6. Hengzhi Fu
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Correspondence to Xinbao Zhao.

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Zhao, X., Liu, L., Yu, Z. et al. Influence of directional solidification variables on the microstructure and crystal orientation of AM3 under high thermal gradient. J Mater Sci 45, 6101–6107 (2010). https://doi.org/10.1007/s10853-010-4696-9

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  • DOI: https://doi.org/10.1007/s10853-010-4696-9

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