文献类型：期刊文献

英文题名：Microstructural evolution and strain hardening rule for V-5Cr-5Ti alloy

作者：Guo, Huili[1,2];Shang, Fulin[2];Zhang, Yongmei[2];Tian, Zhaoyang[2];Chen, Yan[2];Yu, Yong[3];Yan, Shunping[3];Yan, Yabin[4]

机构：[1]Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Gansu, Peoples R China;[2]Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China;[3]China Acad Engn Phys, Inst Syst Engn, Mianyang 621900, Sichuan, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, PR, Peoples R China

年份：2021

卷号：162

外文期刊名：FUSION ENGINEERING AND DESIGN

收录：;EI(收录号：20204909586716);WOS:【SCI-EXPANDED(收录号:WOS:000603549700002)】；

基金：This work was partially supported by the National Natural Science Foundation of China through Grant Nos. 11672220 and 12072248. We thank Glenn Pennycook, MSc, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

语种：英文

外文关键词：V-5Cr-5Ti alloy; Strain hardening; Microstructural evolution analysis; Dislocation density; Finite element method

摘要：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 for providing a more accurate and reasonable prediction of the plastic deformation behavior of V-5Cr-5Ti alloy.