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Influences of Re on low-cycle fatigue behaviors of single crystal superalloys at intermediate temperature

查看全文 作　　者：Liu [1,2]Liu;Jie [1]Meng;Jinlai [1]Liu;Mingke [1]Zou;Haifeng [3]Zhang;Xudong [2]Sun;Yizhou [1]Zhou 高影响力作者 机构地区：[1]Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China;[2]Key Laboratory for Anisotropy and Texture o f Materials,Northeastern University,Shenyang,110819,China;[3]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第9期,共8页高影响力期刊 基　　金：supported financially by the National Natural Science Foundation of China (Nos. 51671188, 51571196 and 51601192);the Shenyang Science and Technology Project (No. 17-101-2-00) 摘　　要：Low-cycle fatigue behaviors of Ni-base single crystal superalloys containing different Re contents have been investigated at 760℃. During heat treatment. Reretards γ phases coarsening and equalizes the distribution of γ' phases. As Re content increases, fatigue life increases and slip bands distribute more inhomogeneously. Moreover, adding Re not only reduces stacking fault energy of the matrix, but also promotes the element segregation to increase the lattice misfit. However, the larger lattice misfit does not lead to the formation of dislocation networks, but which activates dislocation movement and promotes dislocations cross-slip and climbing movement under high temperature and applied stress. On the other hand, with the addition of Re, cyclic deformation behaviors change from cyclic hardening to cyclic stability, mainly depending on a transformation of deformation mechanisms from slip bands cutting through γ and γ' phases to stacking faults shearing. 关 键 词：Single crystal SUPERALLOYS Low-cycle FATIGUE DEFORMATION BEHAVIORS DEFORMATION mechanisms
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