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Dynamic Recrystallization Kinetics of 690 Alloy During Hot Compression of Double-Cone Samples

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Abstract

Hot compression tests of double-cone samples were conducted for 690 alloy to study the kinetic behavior of the complete dynamic recrystallization (DRX) process under low deformation temperatures from 960 to 1080 °C. The microstructure of 82 points in the vertical section of every deformed sample was quantitatively analyzed to determine the DRX fraction. Corresponding strain of these points was calculated by finite element simulations. Kinetic curves of the specimens with different preheating temperatures were then constructed. The features of various boundaries with different misorientation angles were investigated by electron backscatter diffraction technology and transmission electron microscope. The results showed that the strain is continuously and symmetrically distributed along the centerline of the vertical section. Large strain of 1.84 was obtained when the compression amount is 12 mm for double-cone samples. All the fitted kinetic curves display an “S” type, which possess a low growth rate of DRX at the beginning and the end of compression. The critical strain of recrystallization decreases with the increase in preheating temperature, while the completion strain remains around 1.5 for all the samples. The initial and maximum growth rates of DRX fraction have the opposite trend with the change in temperature, which is considered to be attributed to the behaviors of different misorientation boundaries.

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Acknowledgments

The authors appreciate the financial support from National Natural Science Foundation of China (No. 51301085).

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing, 211167, China

    Jue Wang

  2. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China

    Jue Wang & Shun-Chao Zhai

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  1. Jue Wang
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  2. Shun-Chao Zhai
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Correspondence to Jue Wang.

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Wang, J., Zhai, SC. Dynamic Recrystallization Kinetics of 690 Alloy During Hot Compression of Double-Cone Samples. J. of Materi Eng and Perform 26, 1433–1443 (2017). https://doi.org/10.1007/s11665-017-2551-8

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  • DOI: https://doi.org/10.1007/s11665-017-2551-8

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