新しい概念に基づく高温タービンディスク用Ni-Co基超合金の開発(創立40周年記念)

概要

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Recently, we developed a new kind of cast-and-wrought (C&W) Ni-Co base superalloys (TMW alloys) for the applications of turbine disk and high-pressure compressor. TMW alloys were designed by mixing two kinds of γ/γ' two-phase superalloys, Ni-base superalloy and Co-Ti alloy. The temperature capability of TMW alloy aimed 50℃ up compared to the best of current C&W disk superalloys, U720Li. In the subscale study, the forgeability of 50 kg ingot was identified by the processes of extrusion, hot rolling and manufacturing pancakes. The property assessments of the rolled plates indicated the temperature advantage of TMW alloys. The successful manufacturing of full-scale pancakes of some TMW alloys proved that fine grain structures of 10 to 20 μm could be obtained and good processability could be expected. Results of tensile and creep tests of the pancakes showed that the temperature capability of TMW alloys increased at least 50℃ compared to U720Li.
2012-03-20