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Dynamic Recrystallization Mechanism of Inconel 690 Superalloy During Hot deformation at High Strain Rate

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Abstract

The hot deformation characteristics of Inconel 690 superalloy were investigated on the Gleeble-3800 thermal-mechanical simulator. The testing temperatures were in the range of 1000-1200 °C, the strain rate was 10 s−1, and the maximum true strain was 0.9. Optical microscopy, transmission electron microscopy, and electron backscatter diffraction techniques were employed to analyze the microstructure evolution and nucleation mechanisms of dynamic recrystallization (DRX). The results show that multiple-cycle discontinuous dynamic recrystallization (DDRX) occurs in the process of hot deformation under the conditions above. DRX grain size decreases with decreasing temperature and increasing strain. DDRX with sub-grains directly transforming into grains is the dominating nucleation mechanism of DRX. And, the nucleation mechanism of bulging of the original grain boundaries can only be considered as an assistant nucleation mechanism of DRX, which mainly occurs in the beginning of the deformation.

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Acknowledgment

This work has been supported by the National Natural Science Foundation of China (No. 50834008).

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  1. Institute of Metal Research Chinese Academy of Sciences, Shenyang, 110016, China

    Bin Wang, Shi-Hong Zhang, Ming Cheng & Hong-Wu Song

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  1. Bin Wang
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  2. Shi-Hong Zhang
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  4. Hong-Wu Song
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Correspondence to Shi-Hong Zhang.

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Wang, B., Zhang, SH., Cheng, M. et al. Dynamic Recrystallization Mechanism of Inconel 690 Superalloy During Hot deformation at High Strain Rate. J. of Materi Eng and Perform 22, 2382–2388 (2013). https://doi.org/10.1007/s11665-013-0520-4

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  • DOI: https://doi.org/10.1007/s11665-013-0520-4

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