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Dependence of Microstructure on Solution and Aging Treatment for Near-β Forged TA15 Ti-Alloy

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Abstract

For TA15 Ti-alloy, a tri-modal microstructure was obtained via near-β forging combined with solution and aging treatment (SAT) with a short time of air cooling (AC) during forgings transferring before water quenching (WQ). The influence of SAT conditions on final microstructures via 970 °C/0.1 s−1/60%/(AC + WQ) and SAT was investigated. Solution temperature determined the proportion of α and β phases and mainly affected the volume fraction of secondary lamellar α. Solution time mainly influenced the morphology of secondary lamellar α. Solution cooling method was the main factor affecting the thickness of lamellar α. Lower cooling rate resulted in more and thicker lamellar α. Aging treatment had little influence on the volume fraction, size, and morphology of each phase in the microstructure. The main function of aging treatment was to homogenize and stabilize the microstructure. The volume fraction and thickness of lamellar α were increased, and the distribution homogeneity became better during aging. Under the given forging condition, the reasonable solution and aging conditions to obtain tri-modal microstructure were determined as 930 °C/1~2 h/AC + 550~600 °C/5 h/AC.

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Acknowledgments

The authors would like to gratefully acknowledge the supports of the National Natural Science Foundation of China(51275560), Research Fund of the State Key Laboratory of Solidification Processing (NWPU) (156-QP-2016), the 111 Project (B08040), and EU Marie Curie Actions-MatProFuture Project (FP7-PEOPLE-2012-IRSES-318968).

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Authors and Affiliations

  1. State Key Lab of Solidification Processing, Department of Materials Science and Engineering, Northwestern Polytechnical University, P. O. Box 542, Xi’an, 710072, Shaanxi, China

    Zhichao Sun, Huili Wu, Xiaoyong Ma, Xiaojun Mao & He Yang

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  1. Zhichao Sun
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  2. Huili Wu
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Correspondence to Zhichao Sun or He Yang.

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Sun, Z., Wu, H., Ma, X. et al. Dependence of Microstructure on Solution and Aging Treatment for Near-β Forged TA15 Ti-Alloy. J. of Materi Eng and Perform 25, 4549–4560 (2016). https://doi.org/10.1007/s11665-016-2282-2

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  • DOI: https://doi.org/10.1007/s11665-016-2282-2

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