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Microstructure Homogeneity and Mechanical Properties of Large-Size As-Cast High Nb Containing TiAl Alloy Ingot

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Abstract

The high Nb containing TiAl alloy with a nominal composition of Ti–44Al–8Nb–0.2W–0.2B–0.1Y was fabricated by a Vacuum Arc Remelting furnace. The microstructure and mechanical properties of specimens located in different sites of the ingot were investigated. Owing to the influence of melting process and electrode fabricating method, the morphologies and phase containing of this near lamellar structure in the top, middle, and bottom parts of ingot were different. The subtle difference in microstructure strongly influenced the room and high-temperature tensile properties in turn. However, the dominant influence factor of the mechanical properties was the defects at the bottom of this large-size ingot, though the bottom had the finest grain size.

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ACKNOWLEDGMENTS

This work was financially supported by the National Natural Science Foundation of China (nos. 51604191, 51504163), the State Key Laboratory for Advanced Metal and Materials foundation (no. 2014-ZD06) and the Special/Youth Foundation of Taiyuan University of Technology (nos. 2013T004, 2013T003 and 2015QN014). We also thank for the financial supporting of the Qualified Personnel Foundation of Taiyuan University of Technology (nos. tyutrc201342a and tyut-rc201343a).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Taiyuan University of Technology, 030024, Taiyuan, PR China

    S. Z. Zhang, M. Xu & C. J. Zhang

  2. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, 030024, Taiyuan, PR China

    S. Z. Zhang, M. Xu & C. J. Zhang

  3. School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan, 030024, PR China

    J. C. Han

  4. Ningbo Branch of China Ordnance Academy, 315000, Ningbo, PR China

    Y. F. Chen

  5. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, PR China

    F. T. Kong & Y. Y. Chen

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  1. S. Z. Zhang
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  2. M. Xu
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  3. C. J. Zhang
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  4. J. C. Han
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  5. Y. F. Chen
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  6. F. T. Kong
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  7. Y. Y. Chen
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Corresponding authors

Correspondence to S. Z. Zhang or J. C. Han.

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Zhang, S.Z., Xu, M., Zhang, C.J. et al. Microstructure Homogeneity and Mechanical Properties of Large-Size As-Cast High Nb Containing TiAl Alloy Ingot. Phys. Metals Metallogr. 119, 899–906 (2018). https://doi.org/10.1134/S0031918X1809017X

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  • DOI: https://doi.org/10.1134/S0031918X1809017X

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