| Paper Name |
Microstructural evolution and strain hardening rule for V-5Cr-5Ti alloy |
| Author |
Huili Guo, Fulin Shang, Yongmei Zhang, Zhaoyang Tian, Yan Chen, Yong Yu, Shunping Yan, Yabin Yan |
| Publication/Completion Time |
2021-01-02 |
| Magazine Name |
Fusion Engineering and Design |
| Vol |
162 (2021) 112113 |
| Related articles |
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| Paper description |
V-5Cr-5Ti alloy is a promising candidate structural material for fusion-power reactor blankets. However, its plastic deformation behavior, which is important to the safety and reliability of a fusion reactor, is not sufficiently understood. The present paper develops a physically based strain-hardening model to characterize the plastic deformation of V-5Cr-5Ti alloy. Using miniaturized specimens of V-5Cr-5Ti alloy, uniaxial tensile tests and microstructural evolution analysis are performed at different strain levels. Microstructural evolution results show that the existence of Ti-enriched second phase and the dislocation interactions are critical to the plastic deformation of V-5Cr-5Ti alloy. On the above physical basis, the Ti-enriched second phase and the evolution equations of the dislocation density are developed, while the flow stress rule is formulated from the summation of athermal stress, thermally activation stress, and dispersed-phase stress. The finite element method based on the user-material subroutine UMAT (User-defined Material Mechanical Behavior) of commercial ABAQUS code (finite element analysis software) and the implicit stress update algorithm are adopted to realize the proposed physically based strain-hardening model. Results suggest that this new strain-hardening model is superior to conventional models in terms of providing a more accurate and reasonable prediction of the plastic deformation behavior of V-5Cr-5Ti alloy. |
(创新港)
