Abstract
The hot deformation behaviour of the GH4169 alloy in two different initial states (homogeneous and mixed-crystal states) was investigated by performing isothermal compression tests at different strain rates (0.01-1 s−1) and deformation temperatures (1050-1150 °C). Hot-working diagrams were established for both alloy types, and the microstructural evolution in both alloy types during hot deformation was analysed to determine the corresponding deformation mechanism. The experimental results showed that the peak stress of the homogeneous alloy was lower than that of the mixed-crystal alloy for the same temperature and strain rate. Based on the processing maps, the flow instability domain of the homogeneous alloy exceeded that of the mixed-crystal alloy. The optimal processing parameters of the homogeneous alloy were 0.01-0.1 s−1/1050-1100 °C, and 0.01-0.1 s−1/1050-1080 °C (at a lower strain state) or 1100-1150 °C (at a higher strain state) was optimal for the mixed-crystal alloy. Microstructural analysis revealed that the differences in the hot deformation behaviour of the homogeneous and mixed-crystal alloys were caused by the different initial grain sizes and dynamic recrystallization (DRX) mechanisms. The main DRX nucleation method of the homogeneous alloy was discontinuous DRX, whereas that of the mixed-crystal alloy was continuous DRX and discontinuous DRX.
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Acknowledgments
This study was funded by the Central Government Guides Local Science and Technology Development (Grant No. [2019] 4011), the Industrial and Information Development of Guizhou Province (Grant No. [2016] 034), and the Technology Development Project (Grant No. 2017033).
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Ling, M., Zhang, ZS., Liang, YL. et al. Hot-Working Properties of Ni-Based Superalloy GH4169 in Different Initial States. J. of Materi Eng and Perform 31, 6333–6348 (2022). https://doi.org/10.1007/s11665-022-06728-1
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DOI: https://doi.org/10.1007/s11665-022-06728-1