Microstructure evolution and analysis of a single crystal nickel-based superalloy during compressive creep
Microstructure evolution and analysis of a single crystal nickel-based superalloy during compressive creep
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DOI：
10.1016/j.msea.2011.03.035
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发表时间：
2011-06
期刊：
影响因子：
6.4
通讯作者：
T. Sugui;Z. Shu;Liang Fushun;Li Anan;Liang Jingjing
中科院分区：
文献类型：
--
作者：
T. Sugui;Z. Shu;Liang Fushun;Li Anan;Liang Jingjing
在压缩蠕变过程中，[0 0 1]取向单晶镍基高温合金中立方γ′相沿平行于应力轴的方向沿着向筏状组织转变。采用弹性应力应变有限元法（FEM）计算了立方相γ′/γ相的vonMises应力分布，研究了外加应力对γ′相应力分布的影响及γ′相的定向粗化规律。结果表明，外加压应力可以改变立方相γ/γ′相的应力分布，γ′相的粗化取向与γ基体通道的vonMises应力分布有关。其中，在外加压应力作用下，立方γ′相的（0 0 1）面产生较大的vonMises应力是导致显微组织演变的主要原因。提出了压缩蠕变过程中元素扩散和γ′相定向生长驱动力的表达式。
During compressive creep, the cubical γ′ phase in [0 0 1] orientation single crystal nickel-based superalloy is transformed into the rafted structure along the direction parallel to the applied stress axis. By means of the elastic stress–strain finite element method (FEM), the von Mises stress distributions of the cubical γ′/γ phases are calculated for investigating the influence of the applied stress on the stress distribution and the directional coarsening regularity of γ′ phase. Results show that the stress distribution of the cubical γ/γ′ phases may be changed by the applied compressive stress, and the coarsening orientation of γ′ phase is related to the von Mises stress distribution of the γ matrix channel. Thereinto, under the action of applied compressive stress, the bigger von Mises stress produced on (0 0 1) plane of the cubical γ′ phase is thought to be a main reason of the microstructure evolution. The expression of the driving force for the elements diffusion and the directional growing of γ′ phase during compressive creep are also proposed.