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- W250267770 abstract "It is commonly accepted that the drop in mechanical properties of INCONEI718(IN718) after long time exposure at high temperature is a result of coalescence of γ', γ' and the transformation of γ' to δ-Ni3Nb phase. Besides the γ', γ' and δ,the precipitation of B.C.C. α-Cr is another factor that affects the mechanical properties of IN718. In this paper, the Thermal-Calc software is used to reveal the thermodynamic condition of α-Cr formation. The calculated sections of the pseudo ternary diagrams of Cr-Nb-IN718 and Cr-Fe-IN718 explain why α-Cr particles do not precipitate dispersedly in γ matrix but in the vicinity of δ phase. The selected area diffraction (SAD) of TEM confirms the crystallography relationship of α-Cr with δ is (010) δ／／ (-1 1 0) α-Ｃr, [100] δ/[111] α-Cro In combination of TTT diagram with the Thermal-Calc and TEM results, the mechanism of α-Cr formation in IN718 is suggested." @default.
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- W250267770 date "2004-01-01" @default.
- W250267770 modified "2023-09-28" @default.
- W250267770 title "Mechanism of α-Cr Formation in Nickel-Base Superalloy INCONEI718 after Long Time Thermal Exposure" @default.
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