Physical and chemical phase analysis of turbine disk of wrought FGH96
LU Yu-hua1,2, SHEN Xue-jing1,2, LI Jie1, LIU Qing-bin1, FU Rui1, WANG Peng*1,2
1. Central Iron & Steel Research Institute, Beijing 100081, China; 2. CISRI Beijing Key Laboratory of Metal Material Characterization, Beijing 100081, China
Abstract：The samples from different positions along thickness direction of the centre of turbine disk of nickel-based wrought FGH96 high temperature alloy were analyzed by physical and chemical phase analysis methods. The precipitated phases were extracted by electrolysis in different electrolytes under various conditions. The phases and elemental contents were analyzed using X-ray diffractometer (XRD) and inductively coupled plasmas atomic emission spectrometer (ICP-AES). The type, content and composition of precipitated phases were obtained, which were compared to the high temperature creep property at each position. The information of microscopic phases along thickness direction of turbine disk was obtained. Its influence on material properties was speculated and the guidance in improvement of production process was discussed. The results showed that the particle size and content of γ′ phase, the content of carbides and borides along thickness direction of turbine disk of wrought FGH96 alloy were quietly different. The mass fraction of γ′ phase in each position was about 30% along thickness direction of turbine disk of wrought FGH96 alloy. Moreover, the content of γ′ phase in each position had fluctuation. According to the measured results, the difference between highest and lowest mass fraction was about 5.7%. Along the thickness direction of turbine disk, the closer to center was, the larger the particle size of γ′ phase. However, the high temperature creep properties at corresponding position showed an opposite tendency. Furthermore, the content of γ′ phase was high for the position with largest particle size of γ′ phase.
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LU Yu-hua, SHEN Xue-jing, LI Jie, LIU Qing-bin, FU Rui, WANG Peng. Physical and chemical phase analysis of turbine disk of wrought FGH96. , 2018, 38(1): 1-8.
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