Effect of Element Ru on Microstructure and Creep Behavior of Single Crystal Nickel-Based Superalloy
By means of aged treatment, creep property measurement and microstructure observation, the influence of element Ru on the microstructure and creep behavior of single crystal nickel-based superalloy is investigated.The results show that the slice-like μ phase is precipitated along 111 plane in the Ru-free supcralloy during aged at 1080℃.And the precipitation of TCP phase may be restrained after the alloy adds 2%Ru element.Compared to Ru-free alloy, the creep life of the 2%Ru superalloy at 980℃/200MPa increases form 123 h to 333h.The deformation mechanism of alloy in the later stage of creep is dislocations slipping in γ matrix and shearing into the rafted γphase,wherein, the alternate activation of the primary / secondary slipping dislocations results in the twisted of the rafted γphase to form the irregular configuration.Compared to the 2%Ru alloy, the slice-like μ phase precipitated in Ru-free alloy may promote the initiation and propagation of cracks up to fracture, which is thought to be the main reason of the alloy having a lower creep resistances and shorter lifetime.
Single crystal nickel-based superalloys element Ru microstructure TCP phase creep deformation feature
Tian Su-gui Zhu Xin-Jie Li Qiu-Yang Liang Shuang
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870,China
国际会议
长沙
英文
201-206
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）