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Formation of stray grains during directional solidification of a superalloy AM3

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Abstract

Stray grains were found during the preparation of single crystal superalloy AM3 by seeding technique and the researching on the competitive growth of bi-crystal. Stray grains were mainly observed at the diverging 〈001〉 corner of the mold wall. Therefore, increasing orientation deviation angle would intensify the possibility of the formation of stray grains. This was because the solute was inclined to enrich at the diverging 〈001〉 corner of mold wall, leading to the relatively large undercooling, and accordingly resulted in the formation of stray grains.

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Acknowledgements

This work was supported by the National High Technology Research and Development Program of China (863 Program) (No. 2012AA03A511), the National Natural Science Foundation of China (Nos. 50931004, 51101120, 51171151, 51331005), the National Basic Research Program of China (Nos. 2010CB631202, 2011CB610406).

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Authors and Affiliations

  1. State key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, PR China

    Chubin Yang, Lin Liu, Xinbao Zhao, Jun Zhang, Dejian Sun & Hengzhi Fu

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  1. Chubin Yang
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  2. Lin Liu
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  3. Xinbao Zhao
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  4. Jun Zhang
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Correspondence to Lin Liu.

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Yang, C., Liu, L., Zhao, X. et al. Formation of stray grains during directional solidification of a superalloy AM3. Appl. Phys. A 114, 979–983 (2014). https://doi.org/10.1007/s00339-013-8046-z

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