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http://hdl.handle.net/10397/106748
Title: | A two-stage physical-based model for predicting flow stress of as-cast tial alloy under hot deformation conditions | Authors: | Shen, J Zhao, Z Yao, Z Ning, Y Xiong, Y Fu, MW |
Issue Date: | Oct-2018 | Source: | Journal of materials engineering and performance, Oct. 2018, v. 27, no. 10, p. 5384-5394 | Abstract: | The hot deformation behavior of Ti-30Al-4.2Mn-4.5Nb-0.2B alloy was investigated using the isothermal compression experiment at temperatures of 1020-1200 °C and strain rates of 0.001-1 s−1. The flow stress was sensitive to the deformation parameters like temperature and strain rate, which decreases with the increase in temperature and decrease in strain rates. Based on the true stress-true strain data, a two-stage physical-based model was proposed to describe the flow stress curve of as-cast TiAl alloy during hot deformation process. For establishing the model, at first, the flow curves of dynamic recovery (DRV) were modeled by employing stress-dislocation relation and adjusting dislocation annihilation coefficient Ω. Then, the flow curves of dynamic recrystallization (DRX) were modeled by considering the dynamic softening behavior into Avrami equation. Finally, the flow curves in the entire deformation stages could be described by embedding the predicted data of DRV model (i.e., flow stress before the critical strain) into the predicted data by DRX model (i.e., flow stress after the critical strain). The critical strain for initiation of DRX was determined by the double-differentiation method. To evaluate the applicability and effectiveness of DRX kinetics equation, the DRX curves were calculated and were consistent with the microstructure observation. Comparison between the experimental and predicted data shows that the proposed physical-based model can well forecast the flow stress under a wide working domain. | Keywords: | Dynamic recrystallization Dynamical recovery Hot deformation Physical-based model TiAl alloy |
Publisher: | Springer | Journal: | Journal of materials engineering and performance | ISSN: | 1059-9495 | EISSN: | 1544-1024 | DOI: | 10.1007/s11665-018-3618-x | Rights: | © ASM International This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use(https://www.springernature.com/gp/open-research/policies/accepted-manuscript-terms), but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s11665-018-3618-x. |
Appears in Collections: | Journal/Magazine Article |
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Fu_Two-Stage_Physical-Based_Model.pdf | Pre-Published version | 7.93 MB | Adobe PDF | View/Open |
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