Crystal structure and microstructure of metal carbides in Ni superalloy prepared by investment casting
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Rene 80, as a representative Ni-based superalloy for producing jet turbine blades, shows superior mechanical properties andmicrostructure stability during high-temperature engine operation. This study attempts to provide a deep insight into themicrostructure of as-cast Rene 80 prepared by the investment casting method. For better understanding of the microstructure,the characterization of the samples was performed using optical microscopy (OM), field emission scanning electron microscopy(FE-SEM), and energy dispersive spectroscopy (EDS) techniques. Microstructural investigation shows that the as-castmicrostructure of this alloy consists of a dendritic γ matrix, an interdendritic γ/γ' phase, a γ' phase, and MC and M23C6carbides. Because of its high chromium content, the dominant phase was the M23C6-type carbide, whereas other elements inthe alloy lead to the MC-type carbide. In this study, the as-cast microstructure was a γ/γ' dendritic matrix, with precipitationof a secondary phase, such as the M23C6 carbides, at the grain boundaries and interdendritic zones.
Abstract
Rene 80, as a representative Ni-based superalloy for producing jet turbine blades, shows superior mechanical properties andmicrostructure stability during high-temperature engine operation. This study attempts to provide a deep insight into themicrostructure of as-cast Rene 80 prepared by the investment casting method. For better understanding of the microstructure,the characterization of the samples was performed using optical microscopy (OM), field emission scanning electron microscopy(FE-SEM), and energy dispersive spectroscopy (EDS) techniques. Microstructural investigation shows that the as-castmicrostructure of this alloy consists of a dendritic γ matrix, an interdendritic γ/γ' phase, a γ' phase, and MC and M23C6carbides. Because of its high chromium content, the dominant phase was the M23C6-type carbide, whereas other elements inthe alloy lead to the MC-type carbide. In this study, the as-cast microstructure was a γ/γ' dendritic matrix, with precipitationof a secondary phase, such as the M23C6 carbides, at the grain boundaries and interdendritic zones.
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