Influences of Re on low-cycle fatigue behaviors of single crystal superalloys at intermediate temperature
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第9期
论文作者：Liu Liu Jie Meng Jinlai Liu Mingke Zou Haifeng Zhang Xudong Sun Yizhou Zhou
文章页码：1917 - 1924
摘 要：Low-cycle fatigue behaviors of Ni-base single crystal superalloys containing different Re contents have been investigated at 760℃.During heat treatment,Re retards 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 ofthe 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 throughγ and γ’phases to stacking faults shearing.
Liu Liu1,2，Jie Meng1，Jinlai Liu1，Mingke Zou1，Haifeng Zhang3，Xudong Sun2，Yizhou Zhou1
1. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences2. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
摘 要：Low-cycle fatigue behaviors of Ni-base single crystal superalloys containing different Re contents have been investigated at 760℃.During heat treatment,Re retards 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 ofthe 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 throughγ and γ’phases to stacking faults shearing.
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