Abstract
The development of equipment and technology makes it possible to manufacture a Ø2000 mm Alloy 706 disc 800 MN hydraulic press in China. Generally, high temperature or low strain rate is needed during the closed-die forging process to lower the requirement for press capacity; however, it will result in coarse unrecrystallized grains which are not beneficial for mechanical properties . In the investigation of hot deformation behavior by thermo-simulation compression tests in Alloy 706 , it is found that abnormal dynamic recrystallization (DRX) behavior occurs in a high temperature and low strain rate condition. Electron backscatter diffraction (EBSD ) investigation indicates that the fraction of twin boundaries in the abnormal microstructure is 80% lower than that in the normal microstructure , and apparent texture can be detected. Subscale disc forging experiments were carried out to investigate the effects of abnormal microstructure on mechanical properties of Alloy 706 . The microstructure evolution mechanism of abnormal DRX is validated and the influence on mechanical properties is discussed.
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Acknowledgements
The authors appreciate the financial support from National Basic Research Program (863 Program) of China under Grant No.2012AA03A510. The authors also thank Ph.D Jiang He from University of Science and Technology Beijing for the help and advice in the DRX mechanism for abnormal microstructure.
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Huang, S., Zhang, B., Zhang, W., Zhao, G., Qi, Z. (2018). The Abnormal Dynamic Recrystallization Behavior of a Large Alloy 706 Disc. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_68
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DOI: https://doi.org/10.1007/978-3-319-89480-5_68
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