Morphology Evolution of γ' Precipitates during Isothermal Exposure in Wrought Ni-Based Superalloy Inconel X-750

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  • Hisazawa Hiromu
    Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Terada Yoshihiro
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Takeyama Masao
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

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  • Morphology Evolution of γ′ Precipitates during Isothermal Exposure in Wrought Ni-Based Superalloy Inconel X-750

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<p>The morphological evolution of γ′ precipitates and lattice misfit with isothermal aging were closely investigated in wrought Ni-based superalloy Inconel X-750. The γ′ morphology dramatically changes in terms of shape, distribution, coalescence and coherency at the γ/γ′ interface. These processes and their dependence on temperature are summarized as a γ′ morphology map together with a time–temperature–precipitation (TTP) diagram through quantifying relevant morphological parameters. The lattice misfit was measured by X-ray diffraction and is positive; it decreases from 0.6% at room temperature to 0.1% at the aging temperature. These results suggest that the morphological changes of the γ′ precipitates are attributable to very low lattice misfit, the interaction of the elastic field, the volume fraction of the precipitates and incoherence in γ/γ′ interface.</p>

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