Calculation and experiments on the solidification behavior of single crystal superalloy containing ruthenium
In this paper, the calculation and experiments on solidification behavior were investigated in single crystal superalloys with different content of ruthenium. The solidification paths and phase composition were calculated by Scheil model in Thermo-Calc software. The single crystal superalloys were produced by directional solidification furnace with high gradient. The as-solidified microstructure, transformation temperature, structural evolution during long term thermal exposure were analylzed by using scanning electron microscope (SEM), optical microscope (OPM), differential scanning calorimetry (DSC), energy dispersive spectroscopy (EDS). The results calculated by Scheil model show that liquid, gramma, gramma prime, NiAl and P phase would occur sequentially during solidification ，while the equilibrium phases calculated by Thermo-Calc software include liquid, gramma, gramma prime, mue, P-phase in single crystal superalloys with different content of ruthenium. The testing results show that the single crystal superalloys with different content of ruthenium were solidified with dendritic structure. Except forγ/γ′ eutectics, some NiAl based β phase enriched in ruthenium element with blocky morphology formed in the interdendrtic region. With the increase of ruthenium, the amount of NiAl based β phase will be enlarged. During long term thermal exposure for 500h, mu-phase with needle-like shape was found in these alloys. It was found that the transformation temperatures measured by DSC has the same tendency to the results calculated by Scheil model in Thermo-Calc software.
Liu Lirong Jin Tao Liang Jingjing Liang Jingjing Hu Zhuangqi
Department of Superalloy, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 Department of Superalloy, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）