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Effect of heat treatment on microstructure and mechanical properties of cast and directionally solidified high-Nb contained TiAl-based alloys

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Abstract

Two kinds of heavy-alloying β-type TiAl-based alloys Ti44Al6Nb1.0Cr2.0V (A1) and Ti44Al6Nb1.0Cr2.0V0.15Y0.1B (A2) are newly designed. They are prepared by vacuum consumable melting (VCM) and cold crucible directional solidification (CCDS). Via the theoretical analysis and tentative experiment, five alternative heat treatment (HT) schedules are proposed and studied that the corresponding microstructure and room temperature (RT) tensile property are investigated, and finally the optimized HT schedules are acquired. After HT5 (heat preservation in β phase region and at 1290 °C, and then ladder cooling), A2 alloy cast by VCM exhibits a better tensile property with average elongation of 1.20%. For the two CCDS ingots, after HT3 (mainly annealing at 1280 °C), B2 phase and (B2 + γ) blocky morphology are reduced, the columnar grains and small angle lamellas are reserved, and the tensile property also has a moderate improvement.

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ACKNOWLEDGMENT

This research was supported by National Basic Research Program of China (2011CB605504) and the Program of New Century Excellent Talents in University (NCET-12-0153) and National Natural Science of Foundation of China (51274076).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China

    Shulin Dong, Ruirun Chen, Jingjie Guo, Hongsheng Ding, Yanqing Su & Hengzhi Fu

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  1. Shulin Dong
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  2. Ruirun Chen
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  3. Jingjie Guo
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  4. Hongsheng Ding
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  5. Yanqing Su
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Correspondence to Ruirun Chen.

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Dong, S., Chen, R., Guo, J. et al. Effect of heat treatment on microstructure and mechanical properties of cast and directionally solidified high-Nb contained TiAl-based alloys. Journal of Materials Research 30, 3331–3342 (2015). https://doi.org/10.1557/jmr.2015.298

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