IGTC-75 Recent Single Crystal Technology(Session C-1 MATERIAL I)

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Recent developments in the single crystal superalloy were summarized in terms of the casting equipment, the solidification modeling, the structural stability, and analysis of mechanical anisotropy. The developments in the equipment were to obtain cleaner molten metals, the higher temperature gradient at the solidification, and the system automation, which resulted in the improvement of the casting quality and the rejection rate. The single crystal solidification was simulated based on the heat transfer calculations of the thermal radiation emission. The two-dimensional modeling of the solidification process was expressed by the shape and the transition of the iso-solidus lines, giving useful information for the solidification control. The surface recrystallization was induced in single crystals after high temperature heat treatments, and could be suppressed by avoiding the surface mechanical damages prior to the SHT. The bulk recrystallization was observed in some of advanced single crystal alloys which required the SHT at temperatures of about 100℃ higher than that of the conventional single crystal alloys. It was found tht the bulk recrystallization was originated from localized solidification shrinkages, and could be avoided by elaborated foundry practices. It draws attention to the highly anisotropic creep behavior of some modern single crystal alloys showing, in particular, extremely poor creep resistance in the <111> orientation.
公益社団法人日本ガスタービン学会の論文

IGTC-75 Recent Single Crystal Technology(Session C-1 MATERIAL I)

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